1.7 Energy, Work and Power Flashcards
1
Q
What is the principle of conservation of energy
A
Energy cannot be made or destroyed but it can be changed from one form to another.
2
Q
What is the formula for kinetic energy
A
1/2 times m times v squared
3
Q
What is the formula for gravitational potential energy
A
mgh
4
Q
What is the formula for work done
A
Force times distance
5
Q
What is the formula for efficiency in terms of energy
A
useful energy output/ total energy input times 100
6
Q
What is the formula for efficiency in terms of power
A
useful power output/ total power input times 100
7
Q
Define power
A
Work done/ energy transferred per unit time
8
Q
What is the formula for power
A
Joules / seconds
