Work and Power
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18 Terms
Work done
The amount of energy transferred from one form to another when a force causes movement of some sort
Why is work needed
Because you are acting against another force
What is work done against when lifting up a box
Gravity
What form is the final energy in when lifting up a box
Gravitational potential
What is work done against when pushing a chair across a level floor
Friction
What form is the final energy in when pushing a chair across a level floor
Heat
What is work done against when pushing two magnetic north poles together
Magnetic force
What form is the final energy in when pushing two magnetic poles together
Magnetic energy
What is work done against when stretching a spring
The stiffness of the spring
What is the form of the final energy in when stretching a spring
Elastic potential energy
Work done equation
ΔW=FΔs
Which direction is the force doing work acting in
The direction of the movement
If the force doing work is not acting in the same direction as the movement, what must be done?
Resolve the forces
1 joule
The work done when a force of 1 newton moves an object through a distance of 1 metre
Power equation
P = E / t
Variation of the power equation
P = W / t
Power
The rate of energy transferred from one form to another per second
1 watt
1 joule transferred per second