work, energy and power Flashcards
1
Q
define principle of conservation of energy (PCE)
A
Energy can neither be created or destroyed but can be transformed from one form to another, and from on body to another, but the total amount remains constant
2
Q
definition of work done
A
Work done by force = force x displacement in the direction of the force
3
Q
how do you represent work done on a graph?
A
area under a force-distance graph
4
Q
formula for EPE
A
EPE= 1/2 kx^2
5
Q
formula for KE
A
KE= 1/2mv^2
6
Q
definition of power
A
power is the work done per unit time
7
Q
alternative formula for power
A
P=Fv
8
Q
formula for power
A
P= work done / time
9
Q
efficiency formula
A
useful energy output/ total energy input x 100%
