Definitions [4]
Define power.
Power is defined as the rate of doing work or work done per second.
i.e., Power = `("Work done in joule")/("Times in second")`
or, p = `("W (in joule)")/("t (in second)")`
Definition: Power
The rate of doing work is called power.
Define coefficient of restitution.
For two colliding bodies, the negative of the ratio of the relative velocity of separation to the relative velocity of approach is called the coefficient of restitution.
Definition: Collision
The source describes a collision as a process where "several objects come together, interact (exert forces on each other) and scatter in different directions."
Formulae [1]
Formula: Power
Power P = \[\frac{\text{Work done }W}{\text{Time taken }t}\]
or
P = \[\frac {W}{t}\]
Key Points
Key Points: Power
- S.I. unit: If 1 joule of work is done in 1 second, the power spent is said to be 1 watt.
- C.G.S. unit: The C.G.S. unit of power is erg per second (erg s-1).
- Relationship between S.I. and C.G.S. units:
1 W = 1 J s-1 = 107 erg s-1 - 1 horse power (H.P.) = 746 W = 0.746 kW
