Module 3:

Section 3.3 Work, energy and power

3.3.1 Work and conservation of energy	(a) work done by a force;	the unit - joule
	(b) work done by a force	W = Fx cos θ Where x = displacement not a multiplication sign! In my pages 'x' is 's' - less confusion!
	(c) the principle of conservation of energy
	(d) energy in different forms; transfer and conservation
	(e) transfer of energy is equal to work done
3.3.2 Kinetic and potential energies	(a) kinetic energy of an object;	E_k = ½mv² Learners are expected to recall this equation and derive it from first principles.
	(b) gravitational potential energy of an object in a uniform gravitational field;	E_p = mgh Learners are expected to recall this equation and derive it from first principles.
	(c) the exchange between gravitational potential energy and kinetic energy.
3.3.3 Power	power;	P = W/t the unit watt;
		P = Fv Learners are expected to derive this equation from first principles.
	efficiency of a mechanical system;	efficiency = Useful output energy/total input energyx 100%