Work power energy 2

Question 1

In inelastic collisions why do the bodies always stick together?

Answer 1

Because KE is never conserved in such collisions.

Question 2

Other name for collisions in 1D

Answer 2

Head on collisions

Question 3

What happens when two bodies of equal mass undergo elastic collision
?

Answer 3

They simply exchange velocities

Question 4

What happens when a body at rest is strike against buy a moving body?

Answer 4

The kinetic energy of the struck body is equal to the decrease in kinetic energy of the moving body.

Question 5

Define glancing collisions

Answer 5

The collisions for which theta is nearly zero so that phi is practically 90 degrees are called glancing collisions

Question 6

Write the equation for perfectly elastic collision and inelastic collision

Answer 6

Elastic
V1-v2= u1-u2
Inelastic
V2-v1=0

Question 7

Work energy theorem

Answer 7

The work done by a force acting on a body is equal to change produced in a kinetic energy of the body

Question 8

1 hp =

Answer 8

746W

Question 9

Coefficient of restitution

Answer 9

It is defined as the ratio of the velocity or separation to the velocity of approach of colliding bodies. It is denoted by e.

For elastic collision. e=1
For inelastic collisions.
0<e<1
Mathematically
e=v2-v1/u2-u1