Work And Energy Flashcards
A boy holds a mass on his stretched hand.then
Muscular energy is used
The energy possessed by an oscillating pendulum of a clock is
Mechanical energy
What is the commercial unit of energy ?
KW h.
When speed of the moving object is doubled its
Kinetic energy is increased to four times
A ball is thrown vertically upwards. It’s velocity keeps on decreasing. What happens to its K.E when its reaches the maximum height ?
K.E will be zero
If work is done at a faster rate,then
Power is more
Work done by a body can be
Negative,positive,zero
The work done is zero if
The body shows a displacement in perpendicular direction of force applied.
Power =
Work/time
A spring is compressed the P.E of the compressed spring
Increases
The potential energy of a man is maximum when
He is standing
SI unit of power is
Watt
Number of joules contained in 1KW h
3.6 X 10⁶
Work done is said to be positive when a force causes displacement.
In the same direction as the displacement of the object
The rate of work done is called
Power
