Forces and Laws of Motion Test

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Forces and Laws of Motion Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

Identify the incorrect statement.

A
Frictional force always acts parallel to the surface of contact.

B
The weight of a body always acts towards the centre of the Earth.

C
The spring force always pushes a body.

D
The tension of a string always pulls a body.

Solution

The spring force is the force exerted by a compressed or stretched spring upon any object that is attached to it. An object that compresses or stretches a spring is always acted upon by a force that restores the object to its rest or equilibrium position. So, the spring force does not always pushes a body.
Question 2
1 / -0

How much force acts on body whose momentum is constant (i.e. = constant)?

A
p/2t

B
2p/t

C
Zero

D
None

Solution

Force is the rate of change of momentum. So, momentum is constant when force is zero.
Question 3
1 / -0

The principle of conservation of linear momentum states that linear momentum of a system

A
Cannot remain constant

B
Cannot be changed

C
Can be changed only if external forces act

D
Can be changed if only internal forces act

Solution

Linear momentum of a system remains constant. It may get transferred to the bodies in the system itself but the total momentum remains the same.
Question 4
1 / -0

The action and reaction forces referred in the third law

A
Need not be equal in magnitude but must have the same direction.

B
Must act on the same object.

C
May act on different objects.

D
May act on different objects.

Solution

Newton's Third Law of Motion states: 'To every action there is an equal and opposite reaction'. It must be remembered that action and reaction always act on different objects. Action of one object generates reaction in other.
Question 5
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Statement A: Gravitational force is the weakest force in nature.
Statement B: Electrostatic force is an example of non – contact forces.
Which of the above two statements is true?

A
Statement A is true

B
Statement B is true

C
Both the statement a and b are true.

D
Neither statement A nor B are true

Solution

Gravitational force is very weak force as it depends upon mass of the body and distance between two objects. Electrostatic force is non-contact force as it acts even if there is no contact between the objects.
Question 6
1 / -0

Ayush hits a cricket ball. It then rolls of a level ground after covering a short distance, the ball comes to rest. The ball slows and then stops because

A
There is a force on the ball opposing the motion.

B
Velocity is proportional to the force exerted on the ball.

C
Ayush did not hit the ball hard enough.

D
There is no unbalanced force on the ball so the ball would want to come to rest.

Solution

The ball moving on level ground comes to rest after covering a short distance due to frictional force acting on it. So, the ball slows and then stops because there is a force acting on the ball by the floor thus, opposing the motion.
Question 7
1 / -0

Match the following with correct response.
(1) Action and reaction
(2) Magnitude of force
(3) Momentum
(4) Resultant of balanced force

(A) No acceleration
(B) Newton’s second law
(C) Act on different objects
(D) Vector quantity

A
1-D, 2-A, 3-C, 4-B

B
1-A, 2-C, 3-B, 4-D

C
1-C, 2-B, 3-D, 4-A

D
1-B, 2-D, 3-A, 4-C

Solution

According to Newton's third law in every interaction, there is a pair of forces acting on the two different interacting objects.

Newton's second law states that the acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

Momentum is a vector quantity. For a particle with mass, the momentum equals mass times velocity, and velocity is a vector quantity while mass is a scalar quantity. A scalar multiplied by a vector is a vector.

The resultant of balanced force has no acceleration.
Question 8
1 / -0

Match the following with correct response.
(1) Cart pulled by a horse
(2) Backward jerk
(3) Sole of shoe worn out
(4) Recoiling of gun

(A) Friction
(B) Newton’s III law of motion
(C) Law of conservation of momentum
(D) Law of inertia

A
1-A, 2-C, 3-B, 4-D

B
1-C, 2-B, 3-D, 4-A

C
1-D, 2-A, 3-C, 4-B

D
1-B, 2-D, 3-A, 4-C

Solution

1.Cart is pulled by horse due to Newton's third law of motion.

2. Backward jerk is felt on an account of law of inertia.

3. Soles of shoes are worn out due to force of friction while walking.

4. Recoiling of gun after fire occurs in respect to the law of conservation of momentum.
Question 9
1 / -0

Match the following with correct response.
(1) Cause of acceleration
(2) Quantitative measure of inertia
(3) powder applied on carom board
(4) Tyres of vehicles made Rough

(A) Mass
(B) Increases friction
(C) Decreases friction
(D) Force

A
1-B, 2-D, 3-A, 4-C

B
1-C, 2-B, 3-D, 4-A

C
1-A, 2-C, 3-B, 4-D

D
1-D, 2-A, 3-C, 4-B

Solution

1. Any body is accelerated due to force acting on it respecting the first law of motion.

2. Mass is the quantitative measure of inertia.

3. Powder reduces the friction on carom board.

4. Tyres of vehicles are made rough to increase the friction between road and vehicle.
Question 10
1 / -0

When a force is exerted on an object, it can change its-
A State
B Position
C Shape
D Direction

A
(a) and (b) are correct

B
(b) and (c) are correct

C
(a), (b) and (c) are correct

D
All of these

Solution

Force causes change in the state of rest, motion, direction, position or even shape of a body.

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Re-Attempt Weekly Quiz Competition

Forces and Laws of Motion Test - 5

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Forces and Laws of Motion Test - 5

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Question 1

Frictional force always acts parallel to the surface of contact.

The weight of a body always acts towards the centre of the Earth.

The spring force always pushes a body.

The tension of a string always pulls a body.

Solution

Question 2

p/2t

2p/t

Zero

None

Solution

Question 3

Cannot remain constant

Cannot be changed

Can be changed only if external forces act

Can be changed if only internal forces act

Solution

Question 4

Need not be equal in magnitude but must have the same direction.

Must act on the same object.

May act on different objects.

May act on different objects.

Solution

Question 5

Statement A is true

Statement B is true

Both the statement a and b are true.

Neither statement A nor B are true

Solution

Question 6

There is a force on the ball opposing the motion.

Velocity is proportional to the force exerted on the ball.

Ayush did not hit the ball hard enough.

There is no unbalanced force on the ball so the ball would want to come to rest.

Solution

Question 7

1-D, 2-A, 3-C, 4-B

1-A, 2-C, 3-B, 4-D

1-C, 2-B, 3-D, 4-A

1-B, 2-D, 3-A, 4-C

Solution

Question 8

1-A, 2-C, 3-B, 4-D

1-C, 2-B, 3-D, 4-A

1-D, 2-A, 3-C, 4-B

1-B, 2-D, 3-A, 4-C

Solution

Question 9

1-B, 2-D, 3-A, 4-C

1-C, 2-B, 3-D, 4-A

1-A, 2-C, 3-B, 4-D

1-D, 2-A, 3-C, 4-B

Solution

Question 10

(a) and (b) are correct

(b) and (c) are correct

(a), (b) and (c) are correct

All of these

Solution

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