Work, energy and power

What phrase means the same as work done by force?

energy transferred by force

Define work done

product of the force and the distance moved in the direction of the force

Define power

the rate of energy transfer or the rate of work done

Equation that links power, work done and time

P=W/t

Define on joule

1N x 1m

How can efficiency be calculated?

useful power/energy output/ total power or energy input

State the principle of conservation of energy

energy cannot be created or destroyed only transferred between different stores and objects

GPE equation

mgh

Kinetic energy equation

0.5mv²

Why are energy transfers in the real world never 100% efficient?

work done against resistive forces such as friction and air resistance means that some energy is always transferred to the thermal energy stores of an object and its surroundings