Laws Of Motion Test

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Laws Of Motion Test - 13

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Question 1
1 / -0

If the net external force on the body is zero, its:

A
Speed is zero.

B
Acceleration is zero.

C
Displacement is zero.

D
Velocity is zero.

Solution

Given, F_ext = 0.
∵ F = ma
∴ a = 0 [as m cannot be 0]
Question 2
1 / -0

When a bull pulls a cart, the force that helps the bull to move forward is the force exerted by:

A
The ground on the bull.

B
The cart on the bull.

C
The bull on the ground.

D
The ground on the cart.

Solution

Bull exert the force on the ground, and ground exert equal force on cart and bull as well which help them to move forward.
Question 3
1 / -0

Dust can be removed out of a blanket using:

A
Law of inertia.

B
Newton’s second law of motion.

C
Newton’s third law of motion.

D
Newton’s law of gravitation.

Solution

When a blanket is bitten with a stick or something then particles of blanket come into motion while dust particles remains in rest thus comes out which shows law of inertia.
Question 4
1 / -0

Which law governs the phenomenon that a tablecloth is pulled out from under a setting of chinaware without damaging it?

A
Newton’s first law

B
Universal law of gravitation

C
Newton’s second law

D
Newton’s third law

Solution

According to Newton’s first Law, the cloth is set in motion but the chinaware continues to remain in its state of rest; and hence it is not damaged.
Hence, option A is correct.
Question 5
1 / -0

Two masses are in the ratio 1:5. What is ratio of their inertia?

A
1:5

B
5:1

C
1:25

D
25:1

Solution

Force of inertia = ma
Let the masses be 1x and 5x
Force of inertia for 1st body= 1x * a
Force of inertia for 2nd = 5x * a
Ratio= x * a / 5x * a = 1:5
Question 6
1 / -0

We slip on a rainy day due to ______.

A
Change in momentum.

B
Inertia.

C
Decrease in friction.

D
Increase in friction.

Solution

On a rainy day, the rainwater forms a layer on the road.
This layer works like a lubricant which decreases the friction. Due to less friction, we slip on a rainy day.
Question 7
1 / -0

A 6 kg object is subject to three forces
F₁ = 20i + 30j N
F₂ = 8i - 50j N
F₃ = 2i + 2j N
Find the acceleration of object.

A
5i + 3j

B
5i - 3j

C
3i + 5j

D
3i - 5j

Solution

F = F₁ + F₂ + F₃ = 30i - 18j
F = ma
Substituting F and m = 6 kg (given) in the above equation we get,
a = 5i - 3j
Hence (b) is correct choice
Question 8
1 / -0

Passengers in a bus lean forward as bus suddenly stops. This is due to

A
Impulse

B
Change in speed

C
Inertia

D
Change in momentum

Solution

When the bus moves, the passenger's body comes in the state of motion but when the bus stops the lower part of the body which is in contact with the floor comes in the state of rest whereas the upper part of the body still remains in the state of motion and because of this the upper part of the body falls in the forward direction.
This is due to the presence of inertia
Question 9
1 / -0

A particle of mass 'm' original at rest, is subjected to a force whose direction is constant but whose magnitude varies with according to the relation
,Where F₀ and T are constant.
Then speed of the particle after a time 2T is:

A

B

C

D

Solution

Given:
Speed of the particle after a time 2T,
Question 10
1 / -0

How is inertia used when riding a bicycle?

A
Bicycles don’t use inertia.

B
You can stop paddling and still continue rolling forward.

C
You must paddle harder when going up hill.

D
You must paddle slower when going up hill.

Solution

Due to inertia, even if we stop paddling of motion, we will continue to move forward up to a certain distance as friction will finally make us stop.