physics equations Flashcards
Name the equation for weight
- Weight = mass x gravitational field strength
- W = m x g
Name the equation for work done
- Work done = force x distance (along the like of action of the force)
- W = F x s
Name the equation for force applied to a spring
- Force applied to a spring = spring constant x extension
- F = k x e
Name the equation for a moment of a force
- Moment of a force = force x distance(normal to direction of force)
- M = F x d
Name the equation for pressure
- Pressure = force/area
- p = F/A
Name the equation for distance
- Distance = speed x time
- s = v x t
Name the equation for acceleration
- Acceleration = change in velocity/time taken
- a = Δv/t
Name the equation for resultant force
- Resultant force = mass x acceleration
- F = m x a
Name the equation for momentum
- Momentum = mass x velocity
- p = m x v
Name the equation for kinetic energy
- Kinetic energy = 1/2 x mass x speed^2
- Ek = 1/2 x m x v^2
Name the equation for gravitational potential energy
- GPE = mass x gravitational field strength (g) x height
- Ep = m x g x h
Name the equation for power
- Power = energy transferred/time
- P = E/t
OR - Power = work done/time
- P = W/t
Name the equation for efficiency
- Efficiency = useful output energy transfer/total input energy transfer
OR - Efficiency = useful power output/total power input
Name the equation for wave speed
- Wave speed = frequency x length
- v = f x λ (lamda)
Name the equation for charge flow
- Charge flow = current x time
- Q = I x t
Name the equation for potential difference
- Potential difference = current x resistance
- V = I x R
Name the equation for power (circuits 1)
- Power = potential difference x current
- P = V x I
Name the equation for power (circuits 2)
- Power = current^2 x resistance
- P = I^2 x R
Name the equation for energy transferred
- Energy transferred = power x time
- E = P x t
OR - Energy transferred = charge flow x potential difference
*E = Q x V
Name the equation for density
- Density = mass/volume
- ρ = m/V
Name the equation for elastic potential energy
- Elastic potential energy = 1/2 x spring constant x extension
- Ee = 1/2 x k x e^2
Name the equation for specific heat capacity
- Change in thermal energy = mass x specific heat capacity x temperature change
- ΔE = m x c x Δθ
Name the equation for total resistance
- Total resistance = resistance of component 1 + resistance of component 2
- Rt = R1 + R2
