Need-to-Know Equations

Question	Answer
Speed	Speed = Distance / Time
Distance Travelled	Distance Travelled = Average Speed x Time
Acceleration	Acceleration = Change in Velocity / Time Taken
Force	Force = Mass x Acceleration
Weight	Weight = Mass x Gravitational Field Strength
Efficiency	Efficiency = Useful Energy / Total Energy
Momentum	Momentum = Mass x Velocity
Wave Speed	Wave Speed = Frequency x Wavelength or Wave Soeed = Distance / Time
Density	Density = Mass / Volume
Work Done	Work Done = Force x Distance (moved in the direction of the force)
Change in Gravitational Potential Energy	Change in Gravitational Potential Energy = Mass x Gravitation Field Strength x Change in Height
Kinetic Energy	Kinetic Energy = 1/2 x Mass x Speed squared
Power	Power = Word Done / Time Taken or Power = Energy Transferred / Time Taken
Energy Transferred	Energy Transferred = Charge Moved x Potential Difference
Charge	Charge = Current x Time
Potential Difference	Potential Difference = Current x Resistance
Electric Power	Electric Power = Current x Potential Difference or Electric Power = Current squared x Resistance
Force Exerted on a Spring	Force Exerted on a Spring = Spring Constant x Extension
Moment of a Force	Moment of a Force = Force x Distance (normal to the direction of the force)
Pressure	Pressure = Force (normal to surface) / surface area

Resource summary

	Created by Rebecca Carter almost 8 years ago