Tag: work, energy and power

Questions Related to work, energy and power

During any collision

  1. Momentum is conserved

  2. Linetic energy is conserved

  3. Both conserved

  4. All


Correct Option: A
Explanation:

During any collision, the momentum is conserved but the kinetic energy is not. This is because during collision, a part of kinetic energy is converted into heat sound energies.

Collision is a _______event. Fill in the blank. 

  1. Short time

  2. Long time

  3. Gradual

  4. All of the above


Correct Option: A
Explanation:

Collision is a short time event in which two or more bodies apply forces on each other for a relatively short time. 

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


Correct Option: A
Explanation:

When we consider two body as one system, any interaction between them is internal. But when we consider one body (as system), the force applied by the other body is external force.

When two bodies collide, they _________ each other.

  1. Push

  2. Pull

  3. Moves towards

  4. All


Correct Option: A
Explanation:

When two bodies collide, they push each other. As a result, equal and opposite forces act on each body.

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


Correct Option: A
Explanation:
When a speeding ball strakees stumps, they came in contact with each other, due to that a contact force greater between the two.
This face pushes the $3$ function in the direction of motion of the ball resulting it to fall off. 
option $A$ is correct






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


Correct Option: D
Explanation:

When two equal masses moving with equal but opposite velocities collies. Their velocities cancel each other and net velocity becomes zero.

All collision conserves

  1. Kinetic energy

  2. Potential energy

  3. Momentum

  4. All of the above


Correct Option: C
Explanation:
According to the collision theory, all collisions are conserved in momentum in both elastic and inelastic collision. KE is conserved in elastic collision but not in inelastic collision. 

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

  1. 1D

  2. 2D

  3. 3D

  4. None


Correct Option: A
Explanation:

Head on collisions are 1-Dimensional collision which occur, in the same straight line without any deviation to original path.

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. $1 {m}/{s}$


Correct Option: B
Explanation:

In elastic head collision velocities get interchanged.

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


Correct Option: A
Explanation:

The product of average force and the time it is exerted is known as impulse of force.