Tag: physics

Questions Related to physics

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

force exerted by collision collisions work, energy and power mechanics physics

  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

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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.

force exerted by collision collisions work, energy and power mechanics physics

  1. Push

  2. Pull

  3. Moves towards

  4. All

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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

force exerted by collision collisions work, energy and power mechanics physics

  1. Contact force

  2. Non contact force

  3. Displacement force

  4. None

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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

force exerted by collision collisions work, energy and power mechanics physics

  1. v

  2. 2v

  3. -v

  4. zero

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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

force exerted by collision collisions work, energy and power mechanics physics

  1. Kinetic energy

  2. Potential energy

  3. Momentum

  4. All of the above

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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

force exerted by collision collisions work, energy and power mechanics physics

  1. 1D

  2. 2D

  3. 3D

  4. None

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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 

force exerted by collision collisions work, energy and power mechanics physics

  1. $10 {m}/{s}$

  2. $5 {m}/{s}$

  3. $2.5 {m}/{s}$

  4. $1 {m}/{s}$

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Correct Option: B
Explanation:

In elastic head collision velocities get interchanged.

Impulse of force is

force exerted by collision collisions work, energy and power mechanics physics

  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

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Correct Option: A
Explanation:

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

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

force exerted by collision collisions work, energy and power mechanics physics

  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

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Correct Option: B
Explanation:
Collision can be elastic, which means they conserve  both K.E. and momentum. In inelastic collision, they only conserve momentum but not K.E. 

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

force exerted by collision collisions work, energy and power mechanics physics

  1. Momentum of each particle

  2. Speed of each particle

  3. Kinetic energy of each particle

  4. Total kinetic energy of both the particles

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Correct Option: D
Explanation:

Total kinetic energy, i.e., kinetic energy of the system is conserved.