Forces and Laws of Motion Test

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Forces and Laws of Motion Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

When a fireman directs a powerful stream of water from a hose-pipe, the hose-pipe tends to go backward. This is due to

A
Law of conservation of charges

B
Law of Inertia

C
Newton’s third law

D
Law of conservation of energy

Solution

This is based on Newtons third law of motion which states that "to every action, there is an equal and opposite reaction".
Question 2
1 / -0

When a toothpaste tube is squeezed, it's shape changes. The force responsible for this is an example of _______.

A
Balanced force

B
Unbalanced force

C
Centripetal force

D
Tangential force

Solution

When a toothpaste tube is squeezed, it's shape changes. The force responsible for this is an example of balanced force. In this case we apply two equal and opposite balanced forces with the fingers of our hand. Although the tube continues to remain in its stationary position, however, balanced forces change the shape of it.
Question 3
1 / -0

Principle of conservation of momentum is the corollary of ________.

A
Newton's first law

B
Newton's second law

C
Newton's third law

D
Gravitational law

Solution

Action and reaction being equal and opposite and acting simultaneously for same duration, have equal and opposite impulses. They produce equal and opposite changes of momentum in the pair of bodies involved. It keeps the total momentum of the two body system constant.
Question 4
1 / -0

The rate of change of momentum with time is measured in

A
kg m

B
kg ms^-2

C
kg

D
kg ms^-1

Solution

The rate of change of momentum is directly proportional to the force. The unit of force is newton, that is, equal to kg ms^-2
Question 5
1 / -0

If an object experiences a net zero unbalanced force, then the body

A
can be accelerated

B
cannot remain at rest

C
moves with a constant velocity

D
will always remain at rest

Solution

If an object experiences a net zero unbalanced force, then the body moves with a constant velocity, or if it was at rest, then it continues to remain at rest.
Question 6
1 / -0

A hockey player pushes the ball on the ground. Why does the ball come to rest after travelling a certain distance?

A
No unbalanced force acts on the ball.

B
The player stops pushing the ball.

C
The opposing force of friction acts on the ball.

D
The ball moves only when pushes.

Solution

A hockey player pushes the ball on the ground and it comes to rest after travelling a certain distance because an opposing force, that is, frictional force acts on the ball.
Question 7
1 / -0

What is the direction of the unbalanced force acting on a body which is accelerating in a straight line?

A
In the direction of motion of the body.

B
In the direction perpendicular to the motion of the body.

C
In the direction opposite to the motion of the body.

D
None of these.

Solution

A body is accelerating in a straight line. Thus, an unbalanced force has to act on the body in the direction of motion of the body.
Question 8
1 / -0

What is the product of force and the time for which force acts known as?

A
Momentum

B
Acceleration

C
Inertia

D
Impulse of force

Solution

Impulse of force (I) = Force × Time = Change in momentum
Question 9
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Which one is correct if a bullet is fired from a rifle?

A
Bullet moves in the backward direction and rifle moves in the forward direction.

B
Rifle moves in the backward direction and bullet moves in the forward direction.

C
Bullet and rifle both move in the backward direction.

D
There is no motion of bullet and rifle.

Solution

On firing, bullet receives a forward force from the rifle and in turn backward force acts on the rifle, causing the rifle to jerk backward.

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Re-Attempt Weekly Quiz Competition

Forces and Laws of Motion Test - 2

Result

Forces and Laws of Motion Test - 2

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SHARING IS CARING

Question 1

Law of conservation of charges

Law of Inertia

Newton’s third law

Law of conservation of energy

Solution

Question 2

Balanced force

Unbalanced force

Centripetal force

Tangential force

Solution

Question 3

Newton's first law

Newton's second law

Newton's third law

Gravitational law

Solution

Question 4

kg m

kg ms-2

kg

kg ms-1

Solution

Question 5

can be accelerated

cannot remain at rest

moves with a constant velocity

will always remain at rest

Solution

Question 6

No unbalanced force acts on the ball.

The player stops pushing the ball.

The opposing force of friction acts on the ball.

The ball moves only when pushes.

Solution

Question 7

In the direction of motion of the body.

In the direction perpendicular to the motion of the body.

In the direction opposite to the motion of the body.

None of these.

Solution

Question 8

Momentum

Acceleration

Inertia

Impulse of force

Solution

Question 9

Bullet moves in the backward direction and rifle moves in the forward direction.

Rifle moves in the backward direction and bullet moves in the forward direction.

Bullet and rifle both move in the backward direction.

There is no motion of bullet and rifle.

Solution

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kg ms^-2

kg ms^-1