2.2 - Energy Flashcards
(8 cards)
1
Q
what is gravitational potential energy
A
the energy an object has by virtue of its position in a gravitational field
2
Q
what is kinetic energy
A
the energy an object has by virtue of its movement
3
Q
how can you equate both of the formulas
A
1/2mv^2 = mgh
4
Q
what is work done
A
- the product of a force and the distance moved in the direction of the force
work done = energy transferred
wd = Fs
5
Q
what does 1 joule represent
A
1 joule of energy is transferred when 1 newton of force is displaced by 1m
6
Q
what is power
A
the rate of energy transfer
power = energy transferred / time
7
Q
what equation links power, force and velocity
A
power = force x velocity
8
Q
what is efficiency
A
the ability of a machine to convert energy usefully
