P2P8 - Energy: Forces doing work Flashcards
How do you calculate electrical work when theres a current flowing?
Energy =
Potential difference X Current X Time
How do you calculate electrical energy?
Energy =
Power X Time
What is power?
The rate of energy transfer (or work done).
How do you calculate energy?
Efficiency = (useful energy output/total energy input) x 100.
What is a moment?
A moment is the turning effect of a force around a fixed point.
Whats the equation for moment?
Whats the other equation for moment?
(Levers)
Moment =
Force X Perpendicular distance from pivot
Moment =
Force X Distance
What has to happen for an object to be in equilibrium?
Must be either stationary, or moving at a constant speed in a straight line.
Where is a turning effect larger?
As far away from the pivot
What do we use levers and gears for?
Transmit (send) the rotational effect of a force from one place to another.