Energy Flashcards
1
Q
If a body has energy
A
It is possible to transfer energy from it
2
Q
Energy is measured in
A
Joules (J)
3
Q
Law of conservation of energy
A
The total energy in a system cannot be created or destroyed (remains constant) but only transferred from one form to another
4
Q
Principle of conservation of mechanical energy
A
In the absence of air resistance/any other external forces the total mechanical energy of a body is constant
5
Q
Mechanical energy formula
A
Ep + Ek = constant
6
Q
Gravitational potential energy comes about because of
A
The earth’s gravitational field in which all bodies with mass experience a force down towards the centre of the earth
7
Q
Gravitational potential energy formula
A
Ep = mgh
8
Q
Kinetic energy formula
A
Ek = 1/2mv^2
