Forces and Laws of Motion Test

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Forces and Laws of Motion Test - 23

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Question 1
1 / -0

A book remains at rest on a table. It is so because of:

A
no force acts on it

B
friction between the book and the surface of table

C
force exerted by book on the table, is same as the force exerted by the table on the book

D
all of the above

Solution

According to Newton's third law, the table exerts the same force on the book as the force that the book applies on the table. Thus net force acting on the book is zero and hence the book remains at rest on the table.
Question 2
1 / -0

The engine of a car produces acceleration $$4\ ms^{-2}$$ in the car. If this car pulls another car of the same mass. What will be the acceleration produced?

A
$$1\ ms^{-2}$$

B
$$1.5\ ms^{-2}$$

C
$$2\ ms^{-2}$$

D
$$4\ ms^{-2}$$

Solution

According to the newton's second law:
$$F = ma$$
$$F$$ : Applied force on object
$$m$$ : Mass of the object
$$a$$ : Acceleration of the body
$$a =\dfrac {f}{m}$$,
When mass is doubled.
$$m' = 2m$$, then
$$\Rightarrow a' = \dfrac{ F }{ m' }$$
$$\Rightarrow a' = \dfrac{ F }{ 2m }$$
$$\Rightarrow a' = \dfrac{ 4 }{ 2 }$$
$$\Rightarrow a' = 2\ ms^{-2}$$
Question 3
1 / -0

A force is a result of:

A
interaction between two bodies

B
interaction of one body with itself

C
friction

D
all of the above

Solution

One object exerts a force on the other object due to their mutual interaction when the objects either are in contact with each other or placed at certain distance apart.
Hence a force is a result of interaction between two bodies.
Question 4
1 / -0

Four forces are acting on a body. If the body doesn't change its position or shape, the forces:

A
must be of equal magnitude

B
must be parallel & opposite

C
must add up to zero when taken as vectors

D
must be in a single line

Solution

As the body does not change its position or shape, it implies that the net external force acting on the body must be equal to zero since the body is in equilibrium or at rest. Thus the vector sum of the four forces acting on the body must be zero.
Question 5
1 / -0

A force cannot be seen but the effect of force can be felt.

A
True

B
False

C
Ambiguous

D
Data insufficient

Solution

A force is a push or pull upon an object resulting from the object's interaction with another object. A force is not a physical object that can be seen. However, the effect of a force on an object can be seen (i.e. change in its speed, direction of motion, shape and size, etc.)
Question 6
1 / -0

If a ball is thrown upwards from the surface of earth:

A
The earth remains stationary while the ball moves upwards

B
The ball remains stationary while the earth moves downwards

C
The ball and earth both move towards each other

D
The ball and earth both move away from each other

Solution

If a ball is thrown upwards from the surface of earth the ball and earth both move away from each other according to Newton's third law of motion.
Hence,option D is correct.
Question 7
1 / -0

An object will continue accelerating until:

A
Resultant force on it begins to decrease

B
Its velocity changes direction

C
The resultant force on it is zero

D
The resultant force is at right angles to its direction of motion

Solution

we know.
$$Force(F)=mass(m)\times acceleration(a)$$
$$a=\dfrac{F}{m}$$
As mass of the object is constant and can not be zero. So, we can say an object will continue accelerating until the resultant force on it is zero.
Question 8
1 / -0

When a horse pulls the tonga, the tonga moves forward due to:

A
Force exerted by horse in forward direction

B
Reaction of the tonga

C
Reaction of the ground on the horse

D
None of these

Solution

According to Newton's third law, for every action, there is an equal and opposite reaction.
Horse pushes the ground backward to move forward and tonga gets the opposite reaction in forward direction.
Question 9
1 / -0

You are on a frictionless horizontal plane. You can get off the plane :

A
by jumping

B
by throwing some pieces of stone

C
by rolling your body on the surface

D
by running on the plane

Solution

One has to apply a force on a stone to throw it forward and, in return, the stone will apply equal and opposite reaction force helping one to get off the surface.
Question 10
1 / -0

A cannon after firing recoils due to:

A
conservation of energy

B
backward thrust of gases produced

C
Newton's third law of motion

D
Newton's first law of motion

Solution

Explanation:
According to Newton's third law of motion, every action has an equal and opposite reaction.
When a cannon fired a bullet, the force with which the bullet is fired, cannon experiences the same amount of reaction force and so it recoils back.

Hence, a canon after firing bullet recoils due to Newton's third law of motion.
The correct answer is option (C).

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Forces and Laws of Motion Test - 23

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Forces and Laws of Motion Test - 23

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Question 1

no force acts on it

friction between the book and the surface of table

force exerted by book on the table, is same as the force exerted by the table on the book

all of the above

Solution

Question 2

$$1\ ms^{-2}$$

$$1.5\ ms^{-2}$$

$$2\ ms^{-2}$$

$$4\ ms^{-2}$$

Solution

Question 3

interaction between two bodies

interaction of one body with itself

friction

all of the above

Solution

Question 4

must be of equal magnitude

must be parallel & opposite

must add up to zero when taken as vectors

must be in a single line

Solution

Question 5

True

False

Ambiguous

Data insufficient

Solution

Question 6

The earth remains stationary while the ball moves upwards

The ball remains stationary while the earth moves downwards

The ball and earth both move towards each other

The ball and earth both move away from each other

Solution

Question 7

Resultant force on it begins to decrease

Its velocity changes direction

The resultant force on it is zero

The resultant force is at right angles to its direction of motion

Solution

Question 8

Force exerted by horse in forward direction

Reaction of the tonga

Reaction of the ground on the horse

None of these

Solution

Question 9

by jumping

by throwing some pieces of stone

by rolling your body on the surface

by running on the plane

Solution

Question 10

conservation of energy

backward thrust of gases produced

Newton's third law of motion

Newton's first law of motion

Solution

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