Work, energy and power – Physics Academy London

CAIE
5. Work, energy and power

understand the concept of work, and recall and use work done = force × displacement in the direction of the force
recall and apply the principle of conservation of energy
recall and understand that the efficiency of a system is the ratio of useful energy output from the system to the total energy input
use the concept of efficiency to solve problems
define power as work done per unit time
solve problems using P = W/t
derive P = Fv and use it to solve problems

derive, using W = Fs, the formula ∆EP = mg∆h for gravitational potential energy changes in a uniform gravitational field
recall and use the formula ∆EP = mg∆h for gravitational potential energy changes in a uniform gravitational field
derive, using the equations of motion, the formula for kinetic energy EK = 1/2mv2
recall and use EK = 1/2mv2