1
Q
work done
A
force applied x distance moved in direction of the force
2
Q
kinetic energy
A
energy an object has due to the fact it is moving
3
Q
deriving kinetic energy
A
energy = work done
wd= f x s
f= m x a
wd = m x a x s
given u=0 and v=v
v^2 = 2 x a x s
v^2/2 = a x s
wd= m x v^2/2
wd = 0.5 x m x v^2
energy = 0.5 x m x v^2
4
Q
gravitational potential energy
A
the capacity for doing work as a result of an objects position in a gravitational field
5
Q
deriving gpe
A
gpe = wd
wd = f x s
force = always weight so mg
so wd= m x g x s
and direction of force will always be vertical so s=height
gpe= m x g x h
6
Q
power equation with force
A
P=W/t
P= F x d/ t
d/t = v
so
P= F x v
7
Q
conservation of energy
A
The Total Energy of a closed system remains
constant
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