Equations to learn!!! Flashcards
Weight
Weight (N) = mass (Kg) x gravitational field strength (N/Kg)
work done
work done = force x distance ( along the line of action of the force)
force applied to a spring
force applied to a spring = spring constant x extension
F = k e
distance travelled
Distance travelled = speed x time
Acceleration
acceleration = change in velocity / time taken
Resultant force
Resultant force = mass x acceleration
Momentum
momentum = mass x velocity
p = m v
kinetic energy
kinetic energy = 0.5 x mass x (speed)2
Ek = 1/2 m v2
Gravitational potential energy
GPE= mass x gravitational field strength (g) x height
Equation for power with:
Power, energy transferred, time
Power = energy transferred/ time
Equation for power with
power, time, work done
Power = work done / time
work out efficiency
- Efficiency
- Total input energy transfer
- Useful output energy transfer
Efficiency= useful output ET/ Total input ET
ET = energy transfer
Efficiency equation
- Efficiency
- useful power output
- total power input
Efficiency = useful power output / total power input
wave speed
Wave speed = frequency x wavelength
Charge flow
Charge flow = current x time
