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CBSE Notes 2011-2012 » XI-Physics

# Work, Energy and Power

## Answer carefully, with reasons : (a) In an elastic collision of two billiard balls, is the total kin...

Answer carefully, with reasons :
(a) In an elastic collision of two billiard balls, is the total kinetic energy conserved during the short time of collision of the balls (i.e., when they are in contact) ?
(b) Is the total linear momentum conserved during the short time of an elastic collision of two balls ?
(c) What are the answers to (a) and (b) for an inelastic collision ?
(d) If the potential energy of two billiard balls depends only on the separation distance between their centres, is the collision elastic or inelastic ? Note, we are talking here of potential energy corresponding to the force during collision, not gravitational potential energy).

## Is friction a Conservative force ? Give reason.

Is friction a Conservative force ? Give reason.

## Relate 1 kWh with 1 joule.

Relate 1 kWh with 1 joule.

Define work.

## A man raises a mass m to a height 'h' and then shifts it horizontally by a length 'x'. What is the w... 