Physics - Forces And Energy Equations

Question 1

Work done

Answer 1

Work done (j) = force (n) x distance (m)

Question 2

Power

Answer 2

Power (w) = Work done (j) ÷ time taken (s)

Question 3

Efficiency

Answer 3

Efficiency = useful energy ÷ total energy

Question 4

Moment of a force

Answer 4

Moment of a force (nm) = force (n) x distance (m)

Question 5

Kinetic energy

Answer 5

Kinetic energy (j) = 1/2 x mass (kg) x speed² (m/s²)

Question 6

GPE

Answer 6

GPE (j) = mass (kg) x gravitational field strength (n/kg) x change in height (m)