# Shared Flashcard Set

## Details

OCR A Fields,forces and Energy
Work and Energy
6
Physics
04/28/2008

Term
 Define Work
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
 Define kinetic energy
Definition
 Kinetic energy (Ek) is the energy of a moving object.Ek = 0.5 x mass x velocity2
Term
 Define gravitational potential energy
Definition
 Gravitational potential energy (Ep) is energy stored in an object because of another objects gravitational field.ΔEp = 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.0.5mv2=mgΔhwhen re-arrangedv=√(2gΔh)
Supporting users have an ad free experience!