physics chapter 6 energy stores

energy

**Air resistance is sound and thermal/internal energy

types of energy stores

a system

types of systems

different ways energy can be transferred from one store to another

Examples

Example

example

example

example

example

example

calculating size of energy store formula

Kinetic store = ½ mv²

gravitational potential store = mgh

principle of conservation of energy

Must memorise**: The principle of conservation of energy states that energy cannot be created or destroyed within a system. Energy can be transferred from one store to another. The total energy of an isolated system is constant

work done

work done= force x distance

power

power = energy divided by time or work done divided by time

example of power

more time (slower) —> lesser power

lesser time (faster) —> more power

more mass (heavier object)—> more work done —> more power