Work Energy And Power Flashcards
Define work
The product of force and the distance moved in the direction of the force.
Work done is equal to what
Work done= energy transferred
Work done at an angle to motion has the formula:
W= Fxcos(theta)
Energy is scalar or vector?
Energy is scalar as it doesn’t have direction but magnitude.
Define kinetic energy
Is the energy due to the movement of an object.
Define gravitational potential energy
The energy due to the position of an object in the Earth’s gravitational field.
Principle of conservation of energy
Energy can never be created or destroyed, but it can be transferred from one form to another
What is the relationship between KE and mass?
KE is directly proportional to mass
What is the relationship between KE and speed?
KE is directly proportional to the square of its speed.
For an object in a uniform gravitational field!how do you calculate GPE
GPE= mgh
what happens to GPE when an objrct is getting higher?
GPE is gained
What happens to GPE when an object is lowered?
GPE is lost
Give an example where KE and GPE us exchanged?
As an object falls, its GPE decreases and its KE increases.
Equation for when KE and GPE are exchanged
v= √2gh
Only valid when there is no resistive force involved.
Define power
Power is the rate of work done
