Tag: physics

Quizzes (598) Questions (13441)

Questions Related to physics

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

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
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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
Reveal answer Fill a bubble to check yourself
A Correct answer
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






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

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
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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

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

All collision conserves

  1. Kinetic energy

  2. Potential energy

  3. Momentum

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
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. 
Multiple choice force exerted by collision collisions work, energy and power mechanics physics

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. $1 {m}/{s}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In elastic head collision velocities get interchanged.

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

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
Reveal answer Fill a bubble to check yourself
B Correct answer
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. 
Multiple choice force exerted by collision collisions work, energy and power mechanics physics

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
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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