work energy and power Flashcards
1
Q
define work
A
work is done when a force moves its point of application in the direction in which the force acts
2
Q
define energy
A
the ability to do work
3
Q
define kinetic energy
A
the ability to do work due to the movement of a body
4
Q
define gravitational potential energy
A
the ability to do work due to an objects position in a gravitational field
5
Q
define elastic potential energy
A
the ability to do work due to the deformation of a body
6
Q
the equation for work done
A
W= Fs W= Fscos⍬
7
Q
the equation for work done in expanding a gas
A
W= p△V W= pressure x change in volume
8
Q
the equation for kinetic energy
A
ke= 1/2mv^2
9
Q
the equation for gravitational potential energy
A
gpe= mgh
10
Q
define power
A
the rate of doing work
11
Q
the equation for power
A
P= W/t (work done/time taken) P= Fv (force x velocity)
12
Q
the equation for efficiency
A
efficiency = useful work output x100
total energy input
