Term

Definition
Work is the amount of energy transferred from one type to another. Work is measured in Joules. Work = Force x Distance moved in direction of force 


Term
Explain what is meant by the conservation of energy. 

Definition
Energy cannot be made or destroyed. Energy can only be converted from one type to another 


Term

Definition
Kinetic energy (E_{k}) is the energy of a moving object. E_{k} = 0.5 x mass x velocity^{2} 


Term
Define gravitational potential energy 

Definition
Gravitational potential energy (E_{p}) is energy stored in an object because of another objects gravitational field. ΔE_{p} = mgΔh 


Term
Show that for an object that is dropped a height,Δh, it will have a velocity,v. v=√(2gΔh) 

Definition
For a falling object gravitational potential energy is converted into kinetic energy. So Ek=Ep assuming that the initial speed was zero and that the frictional forces was negligible. 0.5mv^{2}=mgΔh when rearranged v=√(2gΔh) 

