# Momentum

## Trending Questions

**Q.**

Important formulas in the chapter force and laws of motion.

**Q.**

Explain what is momentum?

**Q.**

If no external forces acts on a system of particles then the momentum of the system remains conserved.

True

False

**Q.**

Define Momentum. Write its SI unit.

**Q.**

How much momentum will a dumbbell of mass $10kg$ transfer to the floor if it falls from a height of $80cm$? Take its downward acceleration to be $10m{s}^{-2}$.

**Q.**

Is momentum a scalar or vector?

**Q.**

A particle of mass m is projected with a velocity v making an angle 45 degree with the horizontal. The magnitude of the angular momentum of the projectile about the pointof projection when the particle is at its max height h.

**Q.**

A balloon is at a height of 81m and is ascending upwards with a velocity of 12 m/s. A body of 2kg weight is dropped from it. If g=10ms−2 the body will reach the surface of the earth in how much time?

**Q.**

A cricket ball is dropped from a height of 20 m. Calculate the speed of the Ball when it hits the ground and calculate the time it takes to fall through this height. (g=10ms−2)

**Q.**

Lugage placed on the roof of a car or bus is tied with rope.Give reason.

**Q.**

If two bodies of different masses have the same K.E. then the relation between momentum and mass will be:

**Q.**

A hockey ball of mass 200 gram travelling at 10 m/s is struck by a hockey stick so as to return it along with original path with a velocity at 5 m/s . Calculate the change of momentum Orchid in the motion of the hockey Ball by the force applied by the hockey stick.

How did the change of momentum have postive sign?

**Q.**

How much momentum will a dumbbell of mass 10 kg transfer to the floor if it falls from a height of 80 cm (assume that the dumbbell stops after hitting the ground, g=10 ms−2)? ^{ }

40 kg m/s

50 kg m/s

30 kg m/s

35 kg m/s

**Q.**

Two bodies of masses ${m}_{1}$and ${m}_{2}$ have equal kinetic energies. What is the ratio of their linear momenta?

**Q.**

What is the momentum of an object of mass m, moving with a velocity v?

${\left(\mathrm{mv}\right)}^{2}$

${\mathrm{mv}}^{2}$

$\frac{1}{2}{\mathrm{mv}}^{2}$

$\mathrm{mv}$

**Q.**

Explain why it is dangerous to jump from a moving bus

**Q.**

Two bodies of masses ${m}_{1}$ and ${m}_{2}\left(>{m}_{1}\right)$ have equal linear momentum. Which body possesses greater kinetic energy?

**Q.**The masses of two bodies are in the ratio 5 : 6 and their velocities are in the ratio 1 : 2. Then their linear momentum will be in the ratio

- 5 : 6
- 1 : 2
- 12 : 5
- 5 : 12

**Q.**

A body of mass 5 kg is moving with velocity 2ms−1. Calculate its linear momentum.

**Q.**

What is another name for a change in momentum?

**Q.**

A body of mass $4kg$ is accelerated up by a constant force, travels a distance of $5m$ in the first second and a distance of $2m$ in the third second. The force acting on the body is

$2N$

$4N$

$6N$

$8N$

**Q.**

Two balls A and B of masses m and 2m are in motion with velocities 2v and v respectively. Compare : (i) their inertia, (ii) their momentum, and (iii) the force needed to stop them in the same time.

**Q.**

What is the momentum of a 6 kg ball bowling with a velocity of 2.2 metre per second square

**Q.**Why p=mv . why it can't be anything else like mv2, m+v etc.

**Q.**

A bullet of mass 50 g moving with an initial velocity of 100 m s−1 strikes a wooden block and comes to rest after penetrating a distance 2 cm in it. Calculate

(i) initial momentum of the bullet,

(ii) final momentum of the bullet,

(iii) retardation caused by the wooden block, and

(iv) resistive force exerted by the wooden block

**Q.**

Newton's laws of motion are applicable to which frame?

Non-inertial frame of reference.

Laws of motions are frame independent.

Inertial frame of reference.

None of the above.

**Q.**

A lead bullet of mass $2kg$, traveling with a velocity of $20m\xb7{s}^{-1}$, comes to rest after penetrating $20m$ in a still target. Find the resistive force applied by the target and acceleration of the bullet.

**Q.**

A ball of mass 0.1 kg is thrown against a wall... It strikes the wall normally with a velocity of 30 m/s and rebounds with a velocity of 20 m/s. Calculate the change in momentum of the ball...

**Q.**

Two bodies of masses 1 kg and 4 kg have equal linear momentum. What is the ratio of their kinetic energies?

**Q.**

A bullet of mass A and velocity B is fired into a wooden block of mass C. If the bullet gets embedded in the wooden block, then the the magnitude of velocity of the system just after collision will be

(a)A+B/AC . (b)A+C/B+C . (c)AC/B+C . (d)AB/A+C