work, energy and power Flashcards
1
Q
what is work
A
Work is done when energy is transferred and this transfer of energy makes something move.
The greater the force and the greater the distance moved, the more work is done.
2
Q
equation to find work ( energy transfer)
A
w = force * distance
3
Q
state the law of conservation
A
“Energy can be stored or transferred, but it cannot be created or destroyed”
4
Q
how do u find mechanical energy
A
you add potenital energy and kinetic enrgy
5
Q
equation for pe
A
mgh
6
Q
equation for ke
A
half mv squared
7
Q
what is power
A
Power is defined as work done or useful energy transferred every second.
8
Q
equation for power
A
p = work done / time in seconds
9
Q
how to find efficiency
A
efficiency = work done (output) / total energy input
