Exploring Forces Class 8 Worksheet with Answers Science Chapter 5 - #NCSOLVE 📚

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Class 8 Science Chapter 5 Exploring Forces Worksheet

Class 8 Exploring Forces Worksheet

Worksheet On Exploring Forces Class 8 – Exploring Forces Worksheet Class 8

A. Objective Type Questions

Multiple Choice Questions

Question 1.
When two teams pull the rope while playing in a game of tug-of-war, a stage comes when the rope does not move to either side at all. The magnitude of force being applied to the rope by the two teams at that stage will be
(a) greater on first side
(b) greater on second side
(c) equal
(d) sometimes greater on first side than second side
Answer:
(c) equal

Question 2.
Two objects repel each other. This repulsion could be due to
(a) frictional force
(b) gravitational force
(c) magnetic force
(d) either a magnetic or gravitational force
Answer:
(c) magnetic force

Question 3.
A boy apply a force on a rubber ball placed on a table by pressing. The ball may change its
(a) position
(b) Shape
(c) size
(d) direction
Answer:
(b) Shape

Question 4.
Study the diagrams given below. How many of these actions involve the use of friction?

(a) Only A and C
(c) Only C
(b) Only B and D
(d) All of them
Answer:
(d) All of them

Question 5.
During dry weather, while combing hair, sometimes we experience hair flying apart, force responsible for this is
(a) force of gravity
(b) force of friction
(c) electrostatic force
(d) magnetic force
Answer:
(c) electrostatic force

Question 6.
A boy is pulling a heavy box across the floor as shown below. Which, arrows A, B, C and D correctly show the direction of the forces of friction and gravity?

Friction	Gravity
(a) A	B
(b) A	C
(c) C	A
(d) C	D

Answer:
(d)

Question 7.
A toy boat floats in water because
(a) it is lighter than air
(b) water pushes it downward
(c) the buoyant force balances its weight
(d) water has no effect on it
Answer:
(c) the buoyant force balances its weight

Question 8.
A solid iron cube and a hollow plastic cube of the same size are submerged in water. Which experiences more buoyant force and why?
(a) Iron cube, because it is heavier
(b) Plastic cube, because it is hollow
(c) Both experience the same buoyant force, because they displace equal volumes of water
(d) None, because water pushes equally ‘
Answer:
(c) Both experience the same buoyant force, because they displace equal volumes of water

Question 9.
When a ship is loaded with cargo, it sinks deeper in the sea. Which force is responsible for adjusting its floating level?
(a) Frictional force
(b) Magnetic force
(c) Buoyant force
(d) Atmospheric pressure
Answer:
(c) Buoyant force

Question 10.
Two identical blocks are placed in water and oil. One floats higher in w^tef-than in oil. What does this suggest about water and oil?
(a) Oil is denser
(b) Water is denser
(c) Both are equally dense
(d) Density doesn’t matter
Answer:
(b) Water is denser

Question 11.
Two objects rubbed against each other develop X. Which can cause them to Y or Z depending on the type of charges?

X	Y	Z
(a) static charges	attract	fuse
(b) electric flow	repel	melt
(c) static charges	repel	attract
(d) magnetic force	attract	neutralise

Answer:
(c)

Question 12.
A moving object slows down and eventually stops due to X. If the surface is Y, this force becomes less, and the object can travel a Z distance.

X	Y	Z
(a) gravity	rough	shorter
(b) friction	smooth	longer
(c) buoyancy	sticky	curved
(d) magnetism	slippery	broken

Answer:
(b)

Question 13.
Gravitational force shows the following characteristics:
I. It acts between all objects with mass.
II. It always acts in the upward direction.
III. It is responsible for objects falling to the ground.

Choose the correct option:
(a) I and III
(b) II and III
(c) I and II
(d) I, II and III
Answer:
(a) I and III

Question 14.
Electrostatic force can be observed when
I. a comb attracts paper bits after being rubbed.
II. two balloons repel each other after rubbing.
III. a magnet attracts iron nails.

Choose the correct option:
(a) I and II
(b) II and III
(c) I and III
(d) I, II and III
Answer:
(a) I and II

Question 15.
Buoyant force is affected by
I. the volume of the submerged part of the object.
II. the density of the liquid in which the object is immersed.
III. the temperature of the object alone.

Choose the correct option:
(a) I and II
(b) II and III
(c) I and III
(d) I, II and III
Answer:
(a) I and II

Assertion-Reason Questions

The questions given below consist of an Assertion and a Reason. Based on that choose the correct option.
(a) Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.
(b) Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
(c) Assertion is true, but Reason is false.
(d) Assertion is false, but Reason is true.

Question 1.
Assertion: Muscular force is a contact force.
Reason: It involves physical contact between object and the
Answer:
(a) Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

Question 2.
Assertion: A magnet repels plastic because it is non-metallic.
Reason: Magnetic force acts only on magnetic materials like iron, cobalt, and nickel,
Answer:
(d) Assertion is false, but Reason is true.

Question 3.
Assertion: The Earth attracts everything towards itself.
Reason: Gravitational force is a contact force that acts only on solid objects.
Answer:
(c) Assertion is true, but Reason is false.

Question 4.
Assertion: A coin sinks in water while a plastic cap floats.
Reason: The upthrust on both is equal.
Answer:
(c) Assertion is true, but Reason is false.

Question 5.
Assertion: An object in water appears lighter than when it is in air.
Reason: Buoyant force acts downward in liquids.
Answer:
(c) Assertion is true, but Reason is false.

Fill in the Blanks

Question 1.
Fill in the blanks with suitable words:
(a) A force can change the ___________ or the 00 of motion of an object.
Answer:
speed, direction

(b) A force arises due to ___________ between two objects.
Answer:
interaction

(c) The force exerted by the muscles of a human or animal is called ___________ force.
Answer:
muscular

(d) ___________ force always opposes the motion of an object.
Answer:
frictional

(e) ___________ force can act even when the two bodies are not in physical contact.
Answer:
non-contact

(f) The force exerted by a charged body on another charged or uncharged body is called ___________ force.
Answer:
electrostatic

(g) The force exerted by the Earth on all objects is known as ___________ force.
Answer:
gravitational

(h) Buoyant force is exerted by ___________ and ___________ .
Answer:
liquids, gases

(i) A floating object displaces a volume of liquid equal to its own ___________.
Answer:
weight

(j) If the weight of an object is greater than the buoyant force, it will ___________.
Answer:
sink

Question 2.
Fill in the blanks by choosing the suitable words from the box given below:

air friction, muscular, gravitational, weight, fluid friction, frictional force, electrostatic, magnetic, mass.

(a) When we stop rowing a boat, it gradually comes to rest because of ___________ between the boat and water.
Answer:
frictional force

(b) A skydiver experiences two forces while falling: the force of gravity pulling him down and ___________ acting upward.
Answer:
air friction

(c) A horse pulls a cart forward by applying a ___________ force, while the cart pulls the horse backward due to ___________.
Answer:
muscular, frictional force

(d) The attraction between the Earth and the Moon is due to ___________ force, which is a type of non-contact force.
Answer:
gravitational

(e) When a toy boat floats on water, it displaces a volume of water equal to the ___________ of the boat.
Answer:
weight

True/False

Question 1.
Write T for true and ‘F’ for false in front of the statements given below:
(a) Force is required to keep an object moving with uniform speed.
Answer:
False.

No force is needed to keep an object moving at constant speed, due to inertial.

(b) Balanced forces change the state of motion of an object.
Answer:
False.

Balanced forces cancels each other out and do not change the state of motion.

(c) Friction helps us to walk without slipping.
Answer:
True

(d) Electrostatic force can act at a distance.
Answer:
True

(e) Buoyant force acts on objects submerged in liquids and gases.
Answer:
True

Question 2.
Choose the correct sequence of True (T) and False (F) for the statements given below:
(a) Friction acts in the direction of motion.
(b) Upthrust is another name for buoyant force.
(c) Magnetic force can be attractive or repulsive.
(d) Forces acting in opposite directions always cancel out.
(e) Gravitational force decreases with increase in height.
(1) F T T F T
(2) F T F T F
(3) T T T F T
(4) F F T F T
Answer:
(1) FTTFT

Question 3.
Which of the following statements is correct, circle Yes/No

Statement	Yes/No
(a) Gravitational force exists not just between Earth and objects, but between all objects with mass, though it’s only noticeable with very large masses like planets.	Yes/No
(b) Magnetic force can act without physical contact, as seen when a magnet attracts iron nails from a short distance away.	Yes/No
(c) Friction always acts in the direction of motion, whether an object is sliding, rolling, or attempting to move from rest.	Yes/No
(d) A force applied to an object can cause multiple effects simultaneously, including changing its shape, speed, and/or direction of motion.	Yes/No
(e) Electrostatic force can cause attraction between charged and uncharged objects, such as when a rubbed balloon sticks to a wall.	Yes/No
(f) Pressure is calculated by dividing the total force applied by the area over which the force is distributed, which explains why sharp knives cut better.	Yes/No
(g) Buoyant force acts in the downward direction against gravity when an object is submerged in a fluid, helping objects float.	Yes/No
(h) Streamlined shapes, like those of airplanes and fish, are designed to minimize fluid friction by allowing smooth flow of air or water around them.	Yes/No

Answer:

Statement	Yes/No
(a) Gravitational force exists not just between Earth and objects, but between all objects with mass, though it’s only noticeable with very large masses like planets.	Yes
(b) Magnetic force can act without physical contact, as seen when a magnet attracts iron nails from a short distance away.	Yes
(c) Friction always acts in the direction of motion, whether an object is sliding, rolling, or attempting to move from rest.	No
(d) A force applied to an object can cause multiple effects simultaneously, including changing its shape, speed, and/or direction of motion.	Yes
(e) Electrostatic force can cause attraction between charged and uncharged objects, such as when a rubbed balloon sticks to a wall.	Yes
(f) Pressure is calculated by dividing the total force applied by the area over which the force is distributed, which explains why sharp knives cut better.	Yes
(g) Buoyant force acts in the downward direction against gravity when an object is submerged in a fluid, helping objects float.	No
(h) Streamlined shapes, like those of airplanes and fish, are designed to minimize fluid friction by allowing smooth flow of air or water around them.	Yes

Match the Following

Question 1.
Match the statements given in Column I with the suitable words in Column II:

Column I	Column II
(a) Force that opposes motion	(i) Gravitational force
(b) Force acting without contact	(ii) Magnetic force
(c) Force that attracts iron objects	(iii) Buoyant force
(d) Upward force by a fluid on an object	(iv) Friction
(e) Force responsible for objects falling down	(v) Non-contact force
(f) Example of a non- contact force	(vi) Electrostatic force

(a) ___________ (b) ___________ (c) ___________
(d) ___________(e) ___________(f) ___________
Answer:

Column I	Column II
(a) Force that opposes motion	(iv) Friction
(b) Force acting without contact	(v) Non-contact force
(c) Force that attracts iron objects	(ii) Magnetic force
(d) Upward force by a fluid on an object	(iii) Buoyant force
(e) Force responsible for objects falling down	(i) Gravitational force
(f) Example of a non- contact force	(vi) Electrostatic force

Question 2.
Match the statements given in Column I with the suitable words in Column II:

Column I	Column II
(a) Contact force used to kick a ball	(i) Muscular force
(b) Attraction/repulsion between charged bodies	(ii) Pascal
(c) Force that helps a swimmer float	(iii) Newton
(d) SI unit of pressure	(iv) Vector
(e) Quantity with magnitude and direction	(v) Electrostatic force
(f) SI unit of force	(vi) Buoyant force

(a) ___________ (b) ___________ (c) ___________
(d) ___________(e) ___________(f) ___________
Answer:

Column I	Column II
(a) Contact force used to kick a ball	(i) Muscular force
(b) Attraction/repulsion between charged bodies	(v) Electrostatic force
(c) Force that helps a swimmer float	(vi) Buoyant force
(d) SI unit of pressure	(ii) Pascal
(e) Quantity with magnitude and direction	(iv) Vector
(f) SI unit of force	(iii) Newton

B. Subjective Type Questions

Define the Following Terms.

1. Contact Force
______________________________

2. Frictional Force
______________________________

3. Gravitational Force
______________________________

4. Electrostatic Force
______________________________

5. Buoyant Force
______________________________

Give Reasons for the Following

1. A moving ball changes direction when hit from the side.
______________________________

2. Electrostatic force can attract paper without touching it.
______________________________

3. Objects fall towards the Earth when thrown upwards.
______________________________

4. The Earth does not need to touch the Moon to pull it towards itself.
______________________________

5. Water exerts an upward force on submerged objects.
______________________________

6. A heavy object floats if shaped like a boat, but sinks if made into a solid ball.
______________________________

Very Short Answer Type Questions

Question 1.
Is it possible to change the direction of motion of an object without changing the speed of the object?
______________________________

Question 2.
What is the effect of unbalanced forces on a body?
______________________________

Question 3.
What kind of force is exerted when we stretch a rubber band?
______________________________

Question 4.
Which type of force is mainly responsible for changing the shape of clay when pressed?
______________________________

Question 5.
Why is it easier to roll a heavy drum than to slide it?
______________________________

Question 6.
Which force is responsible for the wear and tear of machine parts?
______________________________

Question 7.
What causes a hanging object to fall when its support is removed?
______________________________

Question 8.
What is the direction of buoyant force on a submerged object?
______________________________

Question 9.
An inflated ball floats on water but sinks when punctured. Why?
______________________________

Question 10.
A piece of wood floats on water, but when pressed down and released, it bounces back. What force causes this?
______________________________

Short Answer Type Questions

Question 1.
Complete the following flowchart.

(a) ___________
(b) ___________

Question 2.
The diagram shows a boy kicking a ball.

(a) How can you tell from the path traced by the ball that there is a force acting on it?
______________________________

(b) Explain two effects of force in detail along with examples.
______________________________

Question 3.
You apply a force on a spring and it compresses. What effect of force is observed here?
______________________________
______________________________

Question 4.
You try to push a large rock but fail. Later, you and a friend push it together and it moves. What does this say about forces?
______________________________
______________________________

Question 5.
Observe the following figures (i) and (ii), where in figure (i) table has no cl&th on it, while in figure (ii) has cloth on a table. A pencil cell rool down from point mark ‘A’ in both case. Now, answer the following questions:

(a) In which case, the pencil cell covers more distance?
______________________________

(b) Give the reason for covering different distances by pencil cell in both cases.
______________________________

Question 6.
What will happen to the friction in the cases given below?

	Increase	Decrease
(i) Using spikes in sole of shoes
(ii) Lubricating machines parts
(hi) Rubbing coarse sand on hands by gymnasts

Question 7.
A small magnet is hidden under a sheet of paper. You move another magnet on top and the paper clip moves. What does this show?
______________________________

Question 8.
Why does a wooden log float on water while an iron rod of the same size sinks?
______________________________

Question 9.
How does the shape of an object affect its buoyancy?
______________________________

Question 10.
How can you demonstrate buoyant force using a simple classroom activity?
______________________________

Long Answer Type Questions

Question 1.
Imagine in a tug-of-war competition, Team A pulls the rope with a force of 650 N to the left and Team B pulls with a force of 820 N to the right. Which team will win the competition? Explain your reasoning. Calculate the resultant force acting on the rope and state its direction of motion.
______________________________
______________________________
______________________________

Question 2.
After a football match, Sam and John are asked to collect all the footballs from the ground and put them in a store room. While pushing a heavy cart full of footballs, they exert a force of 55 N and 78 N respectively in the same direction. How does this combined force affect the motion of the cart? What will be the magnitude and direction of the net force acting on the cart?
______________________________
______________________________
______________________________

Question 3.
Look at the figure given below and answer the following questions.

(a) In order to move the book, explain how inserting pencils between the book and the table affect the friction between the two?
______________________________
______________________________

(b) Ball bearings also work on the same principle. Explain.
______________________________
______________________________

Question 4.
A sleigh is sliding down a hill covered with snow, making the sleigh move rapidly,
(a) What type of friction is primarily responsible for slowing down the sleigh?
______________________________
______________________________

(b) What would happen to friction if the sleigh is loaded with more weight?
______________________________
______________________________

(c) How would the speed of the sleigh changes if there was grass on the hill instead of snow?
______________________________
______________________________

Question 5.
Design a classroom activity to demonstrate the difference between muscular force and magnetic force. Explain the procedure and observations.
______________________________
______________________________

Question 6.
Can a non-contact force change the shape of an object? Give your opinion and support your answer with examples or counter examples.
______________________________
______________________________

Question 7.
List and explain five situations where more than one force acts on a body at the same time. For each, state whether the forces are contact or non-contact, and their effect on the body.
______________________________
______________________________

Question 8.
You are given a plastic bottle, water, and some stones. Design an activity to show that buoyant force depends on the weight of the object. Explain the observations and conclusion.
______________________________
______________________________

Question 9.
You notice that a fresh egg sinks in water but floats when salt is added. Describe this activity and explain what it tells us about buoyant force?
______________________________
______________________________

Question 10.
Design an activity to show that the amount of water displaced is related to the volume of the object submerged, and link this to buoyant force.
______________________________
______________________________

Case Based Questions

Question 1.
Two groups of students are playing tug-of-war.

(i) Choose the correct direction of force applied by group 1 and group 2.

Answer:
(d)

(ii) Group 1 is pulling with 250 N force and Group 2 is pulling with 300 N force. What would be the likely position of the two groups after a minute of pulling?

Answer:
(a)

(iii) What is the magnitude of the resultant force and who wins the game?
(a) 550N, Group 1
(b) 300N, Group 2
(c) 250N, Group 1
(d) 50N, Group 2
Answer:
(d) 50N, Group 2

Question 2.
Sana placed the same rubber ball in three containers filled with water, honey, and kerosene. She observed that the ball floated highest in honey, then in water, and lowest in kerosene.
I. In which liguid did the rubber ball experience the greatest buoyant force?
(a) Water
(b) Honey
(c) kerosene
(d) Same in all
Answer:
(b) Honey

II. The difference in how the ball floated in each liquid is due to ?
(a) Volume of the ball
(b) Shape of the containers
(c) Density of the liquids
(d) Temperature of the air
Answer:
(c) Density of the liquids

III. What can be concluded from this activity?
(a) Buoyant force only works in water
(b) Upthrust is more in thicker liquids
(c) All liquids exert same force
(d) Rubber absorbs liquids
Answer:
(b) Upthrust is more in thicker liquids

Skill Based Activities

1. Unscramble the jumbled words to get the correct word using the clues given below:
(a) It helps you lift a bucket from a well using your arms.
→ RALUCSUM ______________________________
Answer:
MUSCULAR

(b) It opposes motion and can cause machines to heat up.
→ RITOCINF ______________________________
Answer:
FRICTION

(c) This force doesn’t need a medium or contact to act.
→ ONN-NOCACTT ______________________________
Answer:
NON-CONTACT

(d) This invisible force binds the solar system together.
→ TAYIGRV ______________________________
Answer:
GRAVITY

(e) You notice this force when an object feels lighter in water.
→ YBCAUNOY ______________________________
Answer:
BUOYANCY

Question 2.
Find the words from the puzzle with the help of the clues given below:
(a) Find the force that pulls objects towards the Earth. ___________
(b) Which force helps a boat float on water? ___________
(c) Locate the force that opposes motion. ___________
(d) Identify the force exerted when a person lifts a bag. ___________
(e) Which kind of force doesn’t need physical contact? ___________

Answer:
(a) GRAVITY
(b) BUOYANCY
(c) FRICTION
(d) MUSCULAR
(e) MAGNETIC

Question 3.
Identify the types of forces from the riddles given below:
i. I push, I pull, I twist, I bend,
On me, all motions do depend.
Without me, objects stay still or flow,
What am I that makes them go? ___________
Answer:
FORCE

ii. North and South, I love to meet,
Through metal, I dance — silent, discreet.
No touch needed to make things shift,
I attract or repel as a powerful gift. ___________
Answer:
MAGNETIC FORCE

iii. Rub me once and I’ll surprise,
Watch the paper bits rise like flies.
I live in charges, quiet but strong,
I’ll shock you if you hold me too long! ___________
Answer:
ELECTROSTATIC FORCE

iv. Push me in, and I push back,
I help a ship stay on its track.
Heavier than me? Then down you go,
Lighter? I’ll hold you — nice and slow. ___________
Answer:
BUOYANT FORCE

The post Exploring Forces Class 8 Worksheet with Answers Science Chapter 5 appeared first on Learn CBSE.

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