Equations Flashcards
Weight
Weight= mass X gravitational field strength
N = kg x N/kg
Work done
Work done = force X distance
J = N X M
Force applied to a spring
Force applied to a spring = spring constant X extension
N = N/M X M
Distance travelled
Distance travelled = speed X time
M = M/S X S
Acceleration
………………………………M/S
^
Change in velocity V
Acceleration=____________________ (A= ____ )
Time taken T
M/S^2 S
Resultant force
Resultant force = mass X acceleration
N = kg X M/S^2
Momentum
Momentum = mass X velocity
Kgm/S = Kg X M/S
Kinetic energy
E = 0.5 X M X (V)^2
Kinetic energy = 0.5 X mass X (speed)^2
J = 0.5 X kgX M/S^2
Gravitational potential energy
Gravitational potential energy = mass X grav field strength X height
J= Kg X N/Kg X M
Power (energy transferred)
………………………J
^
Energy transferred E
Power =_____________________ P=__
Time T
^
W = S
Power ( work done)
………………J
^
Work done W
Power= ___________ P=___
Time ……T
^
W= S
Efficiency ( energy transfer)
……………………………………J
^
Useful output energy transfer
Efficiency = _____________________________
Total input energy transfer
^
……………………………………J
Efficiency (power)
………………………………J
^
Useful power output
Efficiency =______________________
Total power input
^
…………………………………J
Wave speed
Wave speed =frequency X wave length
M/S = Hz X M
Charge flow
Charge flow = current X time
C = A X S
