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Collision Forces and Momentum Conservation

Physics quiz covering forces exerted during collisions, momentum conservation, impulse, elastic and inelastic collisions, and related numerical problems

22 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

During any collision

  1. Momentum is conserved
  2. Linetic energy is conserved
  3. Both conserved
  4. All
Question 2 Multiple Choice (Single Answer)

Collision is a _______event. Fill in the blank. 

  1. Short time
  2. Long time
  3. Gradual
  4. All of the above
Question 3 Multiple Choice (Single Answer)

For two body system, the forces they apply on each other during collision with each other are

  1. external forces on the system
  2. internal forces within the system but external forces on each body
  3. external forces on the system but internal forces on each body
  4. None
Question 4 Multiple Choice (Single Answer)

When two bodies collide, they _________ each other.

  1. Push
  2. Pull
  3. Moves towards
  4. All
Question 5 Multiple Choice (Single Answer)

In the game of cricket, the stumps falls when the ball strikes them. This is an example of

  1. Contact force
  2. Non contact force
  3. Displacement force
  4. None
Question 6 Multiple Choice (Single Answer)

Two bodies of equal masses moving with equal velocities in opposite direction collide the resultant velocity of combination is

  1. v
  2. 2v
  3. -v
  4. zero
Question 7 Multiple Choice (Single Answer)

All collision conserves

  1. Kinetic energy
  2. Potential energy
  3. Momentum
  4. All of the above
Question 8 Multiple Choice (Single Answer)

Head on collision are .............. collisions

  1. 1D
  2. 2D
  3. 3D
  4. None
Question 9 Multiple Choice (Single Answer)

A billiard ball moving with a speed of $5  {m}/{s}$ collides with an identical ball originally at rest. If the first ball stops after collision then the second ball will move forward with a speed 

  1. $10 {m}/{s}$
  2. $5 {m}/{s}$
  3. $2.5 {m}/{s}$
  4. $1 {m}/{s}$
Question 10 Multiple Choice (Single Answer)

Impulse of force is

  1. Product of average force and time
  2. Division of average force and time
  3. Integration of average force and time
  4. All of the above
Question 11 Multiple Choice (Single Answer)

In elastic collision, $A$ is conserved while in inelastic collision $B$ is conserved.
I.Momentum
II.Kinetic Energy
III.Potential Energy

  1. $A$ = I, II
    $B$ = I, III
  2. $A$ = I, III
    $B$ = I
  3. $A$ = III
    $B$ = II, III
  4. $A$ = II
    $B$ = I, III
Question 12 Multiple Choice (Single Answer)

In an elastic collision of two particles the following is conserved.

  1. Momentum of each particle
  2. Speed of each particle
  3. Kinetic energy of each particle
  4. Total kinetic energy of both the particles
Question 13 Multiple Choice (Single Answer)

Co-efficient of restitution is zero in

  1. Perfectly Inelastic collision
  2. Perfectly elastic collision
  3. Both A and B
  4. None
Question 14 Multiple Choice (Single Answer)

Line which is common normal for surfaces in contact during impact is known as

  1. Line of impact
  2. Line of collision
  3. Line of energy
  4. None
Question 15 Multiple Choice (Single Answer)

How much force is exerted on a gunner by the machine gun, when the gunner fires machine gun, and $500$ bullets per minute are fired . The mass of bullet is $10g$ and it moves at $400\ m/s$ so as to avoid recoil.

  1. $\dfrac{100}{3}N$
  2. $200N$
  3. $2000N$
  4. $1000N$
Question 16 Multiple Choice (Single Answer)

A ball of  mass $0.2kg$ is thrown against the wall$,$ the ball strikes the wall normally with velocity of $30m/s$ sand rebounds with velocity of $20m/s.$ Calculate the impulse of the force exerted by the ball on the wall

  1. $2N$
  2. $-10N$
  3. $20N$
  4. $40N$
Question 17 Multiple Choice (Single Answer)

If a cricket ball hits you, it will hurt much more than a tennis ball would when moving with the same velocity because:

  1. a cricket ball is bigger
  2. a cricket ball has more mass
  3. a cricket ball has less density
  4. none of the above
Question 18 Multiple Choice (Single Answer)

Two solid rubber balls $A$ and $B$ having masses $200$ grams and $400$ grams are moving in opposite directions with velocity of $A$ equal to $0.3   {m}/{s}$. After collision the two balls come to rest, then the velocity of $B$ is

  1. $0.15 {m}/{s}$
  2. $1.5 {m}/{s}$
  3. $- 0.15 {m}/{s}$
  4. None
Question 19 Multiple Choice (Single Answer)

A shell of mass $m$ moving with velocity $V$ suddenly breaks into $2$ pieces. The part having mass ${m}/{4}$ remains stationary. The velocity of the other shell will be:

  1. $V$
  2. $2V$
  3. ${3}/{4} V$
  4. ${4}/{3} V$
Question 20 Multiple Choice (Single Answer)

Two bodies having same mass $40   kg$ are moving in opposite directions, one with a velocity of $10  {m}/{s}$ and the other with $7   {m}/{s}$. If they collide and move as one body, the velocity of the combination is

  1. $10 {m}/{s}$
  2. $7 {m}/{s}$
  3. $3 {m}/{s}$
  4. $1.5 {m}/{s}$
Question 21 Multiple Choice (Single Answer)

Two equal masses ${m} _{1}$ and ${m} _{2}$ moving along the same straight line with velocities $+3  {m}/{s}$ and $-5  {m}/{s}$ respectively collide elastically. Their velocities after the collision will be respectively :

  1. $+4 {m}/{s}$ for both
  2. $-3 {m}/{s}$ and $+5 {m}/{s}$
  3. $-4 {m}/{s}$ and $+4 {m}/{s}$
  4. $-5 {m}/{s}$ and $+3 {m}/{s}$
Question 22 Multiple Choice (Single Answer)

A machine gun of mass 5 kg fires 30 bullets, each of mass 50 g, per minute at a speed of $400,m,{s^{ - 1}}$. What force must be exerted to keep the machine gun in position?

  1. $30N$
  2. $10N$
  3. $27N$
  4. $33N$

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