PhysicsWork Flashcards
(24 cards)
Work done
the ammount of energy transferred when one body exerts force on another , the energy transeffered by a force when it moves
Work done=Energy transferred
equation for work
W=force times distance
Sankey diagram
a flow diagram that repersents the principle of conservation of energy the width of the arrows is the same as the total energy
Prinicble of conservation of energy
Energy is never destroyed only stored or transferred
Calculate effecieny
efficency= useful energy output/total energy output
percentage efficency
efficency= useful energy output/total energy output times 100
Kinetic energy
energy of moving object
energy
quantity that must be changed or transferred to make something happen.
G.P.E
energy of something higher in the air due to gravity
Doing work
transferring energy by means of a force
change in G.P.E
change in MGH
how to find kinetic energy
1/2 times mass times vecolicty2
1J is equal to
1nm
what is power
the rate at wich work is done or the rate at wich energy is transfered
power equation
Work done
____________
time taken
what is the equation for momentum
p=mass times velocity
Units for momentum
kg times m/s
what is momentum
Momentum is a measure of how hard it is to stop a moving object
Equation for finding period of pengulum
by dividing the distance it is pulled back by the maximum speed
equation for finding GPE
mass times gravity times height
equation for moment
force times perpendicular distance
The law of conservation of momentum
states that the total momentum before a collision must be equal to the total momentum after the collision.
equation for momentum
mass times velocity
impulse is equal too
change in momentum
