Physics-Energy transfers Flashcards
1
Q
What is the equation for gravity potential energy
A
Mass x Gravitational Field Strength x Height
2
Q
What is the equation for kinetic energy
A
1/2 x mass x velocity
3
Q
What is meant by the conservation of energy
A
Total amount of energy in a closed system remains constant
Energy cannot be created or destroyed but can change from one form to another
4
Q
What is waste energy
A
The energy that is not used by the device for its desired purpose
5
Q
Two equations to calculate efficiency
A
useful output energy divided by total input energy
useful power output divided by total power output
6
Q
State three methods of reducing heat loss in a building
A
Double glazing
Loft and wall insulation
Thicker walls
7
Q
How can the efficiency of a system be increased
A
Reducing waste output
Recycling waste output
