Work power energy 2 Flashcards

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1
Q

In inelastic collisions why do the bodies always stick together?

A

Because KE is never conserved in such collisions.

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2
Q

Other name for collisions in 1D

A

Head on collisions

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3
Q

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

A

They simply exchange velocities

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4
Q

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

A

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

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5
Q

Define glancing collisions

A

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

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6
Q

Write the equation for perfectly elastic collision and inelastic collision

A

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

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7
Q

Work energy theorem

A

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

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8
Q

1 hp =

A

746W

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9
Q

Coefficient of restitution

A

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

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