An object of mass 2 kg moving under the action of a force which varies with time as shown in the figure. Which one of the following statements is correct for the interval from 0 to 20 s ?

The momentum of the object increases by 75 ms - 1 .

The momentum of the object decreases by 75 ms - 1 .

The momentum of the object increases by 125 ms - 1 .

The change in momentum cannot be found as the initial speed is unknown.

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Important Questions on Force and Laws of Motion

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Science>Physics>Force and Laws of Motion>Second Law of Motion

An object of mass

2 kg

moving under the action of a force which varies with time as shown in the figure.
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Which one of the following statements is correct for the interval from

0 to 20 s

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Science>Physics>Force and Laws of Motion>Second Law of Motion

In a two body collision, the momentum is varying with time as shown in graph. The instantaneous force is maximum at:

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Science>Physics>Force and Laws of Motion>Second Law of Motion

Among the following, the body possessing highest momentum is :

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Science>Physics>Force and Laws of Motion>Second Law of Motion

A force ‘F’ is applied on one end of a rope of length ‘a’. P and Q are two points of length ‘b’ from nearest end. The ratio of tensions in string at P & Q is :

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Science>Physics>Force and Laws of Motion>Second Law of Motion

A wooden plank of length

L

rests on a frictionless floor. A boy of mass

M

now runs over the plank starting from its one end. If one wooden plank is

\frac{M}{5}

, the distance covered by the boy relative to the ground will be:

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Science>Physics>Force and Laws of Motion>Second Law of Motion

A horizontal force $‘ F ’$ is applied to keep the block stationary on a frictionless inclined plane. Find the angle of incline, for which the applied force is equal to the weight of body:

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Science>Physics>Force and Laws of Motion>Second Law of Motion

A person of weight

W

jumps to ground with his legs fixed and comes to rest with an upward acceleration of

3 g .

(

g

is acceleration due to gravity). The force exerted by him during landing is:

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Science>Physics>Force and Laws of Motion>Second Law of Motion

Action and reaction force acts on:

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Science>Physics>Force and Laws of Motion>Second Law of Motion

A small block of material having relative density

\frac{1}{3}

is immersed in a liquid and released. The block starts moving upwards with an acceleration

a

. The value of

a

is :(

g

is the acceleration due to gravity)

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Science>Physics>Force and Laws of Motion>Second Law of Motion

According to third law of motion, action and reaction:

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Science>Physics>Force and Laws of Motion>Second Law of Motion

The variation in momentum with time, for a body under collision is shown in figure. The maximum & minimum instantaneous forces are respectively on these points:

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Science>Physics>Force and Laws of Motion>Second Law of Motion

A bullet of

20 g

is horizontally fired with velocity of

150 m s^{- 1}

from pistol of mass

2 kg

. What is the recoil velocity of the pistol?

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Science>Physics>Force and Laws of Motion>Second Law of Motion

An object of mass

10 gm

is moving with an acceleration of

10 m / s^{2}

. Force acting on the object will be:

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Science>Physics>Force and Laws of Motion>Second Law of Motion

A cork is immersed in a jar of water and released. How the cork will move if the jar is assumed to be kept in a satellite orbiting earth:

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Science>Physics>Force and Laws of Motion>Second Law of Motion

A machine gun fires a bullet of mass

40

gram at a speed of

1200 m s^{- 1}

. The man holding it can exert a maximum force of

144 N

on the gun. How many bullets can he fire per second at the most?

EASY

Science>Physics>Force and Laws of Motion>Second Law of Motion

Read the following statements and choose the correct option:
Statement: Newton's second law of motion gives the measurement of force.
Reason: According to Newton's second law of motion, force is directly proportional to the rate of change of momentum.

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Science>Physics>Force and Laws of Motion>Second Law of Motion

A light and a heavy object have same momentum, then:

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Science>Physics>Force and Laws of Motion>Second Law of Motion

A packet of weight