3.3 - Motion - Work, Energy and Power Flashcards
1
Q
What is work done
A
Transfer of energy
2
Q
State the principle of conservation of energy
A
In a closed system, energy cannot be created or destroyed but only transferred from one form to another.
3
Q
Define kinetic energy
A
Energy associated with the motion of an object with mass
4
Q
Define gravitational potential energy
A
Energy of an object due to its position in a gravitational field
5
Q
Define elastic potential energy
A
Energy stored by an object as a result of a reversible change in its shape
6
Q
What is the rate of work
done equal to
A
Power
7
Q
What is efficiency
A
Efficiency (%) = useful output power / total input power x 100
