C7 - work energy and power Flashcards
1
Q
doing work
A
transferring energy to another objects
2
Q
equation for work done
A
force x distance moved in direction of force (J)
3
Q
word definition of work done
A
when 1n has moved 1m in direction of the force
4
Q
how do we manipulate the equation if force is at an angle to direction it is moving in
A
fxcos()
5
Q
what is equation for gravitational potential energy
A
GPE = mgh
6
Q
what is equation for kinetic enrgy
A
0.5 x mass x velocity (squared)
7
Q
if we join GPE and KE together what equation do we get
A
velocity squared = 2 x gravity x height
8
Q
what is equation for efficiancy
A
usefull enrgy output/total energy output
9
Q
what is equation for power
A
work done/time taken (W)
10
Q
what is word definition of power
A
the rate at which work is done
