Physics Equations

Question 1

Weight

Answer 1

Weight = Mass x Gravitational Field Strength (g)

Question 2

Work Done

Answer 2

Work Done = Force x Distance (along the line of action of the force)

Question 3

Force Applied to a Spring

Answer 3

Force Applied to a Spring = Spring constant x Extension

Question 4

Pressure

Answer 4

Pressure = Force Normal to a Surface/Area of that surface

Question 5

Distance Travelled

Answer 5

Distance Travelled = Speed x Time

Question 6

Acceleration

Answer 6

Acceleration = Change in Velocity/Time Taken

Question 7

Resultant Force

Answer 7

Resultant Force = Mass x Acceleration

Question 8

Momentum

Answer 8

Momentum = Mass x Velocity

Question 9

Kinetic Energy

Answer 9

Kinetic Energy = 0.5 x mass x (speed)²

Question 10

Moment of a Force

Answer 10

Moment of a Force = Force x Distance (normal to direction of force)

Question 11

Gravitational Potential Energy

Answer 11

Gravitational Potential Energy = Mass x Gravitational Field Strength (g) x Height

Question 12

Power

Answer 12

Power = Energy Transferred/Time

Power = Work Done/Time

Power = Potential Difference x Current

Power = (current)² x Resistance

Question 13

Efficiency

Answer 13

Efficiency = Useful Output Energy Transfer/Total Input Energy Transfer

Efficiency = Useful Power Output/Total Power Input

Question 14

Wave Speed

Answer 14

Wave Speed = Frequency x Wavelength

Question 15

Charge Flow

Answer 15

Charge Flow = Current x Time

Question 16

Potential Difference

Answer 16

Potential Difference = Current x Resistance

Question 17

Energy Transferred

Answer 17

Energy Transferred = Power x Time

Energy Transferred = Charge Flow x Potential Difference

Question 18

Density

Answer 18

Density = Mass/Volume