3.3 work, energy and power

Cards (10)

what is the unit of work done?
joules
what is the equation for work done?
work done = force x distance moved in the direction of the force
what is 1 joule?
it is when a force of 1 N moves an object by 1m in the direction of the force
what is the relationship between energy and work done?
work done = energy transferred
what is the principle of conservation of energy?
the total energy in a closed system remains constant. energy can not be created or destroyed but can be transformed from one form to another
what is kinetic energy?
energy due to an object moving with mass
what is gravitational potential energy?
energy of an object due to its position in the gravitational field
how to work out final speed when GPE = KE?
v = root 2gh
only valid when no resistive forces acting on the object
what is power?  
rate of work done / rate of energy transferred
p = w/t
what is the relationship between power and motion?
p = Fv