Physics Formulae

Question 1

Weight (N)

Answer 1

mass (kg) x gravitational field strength (N/kg)

Question 2

Work Done (J)

Answer 2

Force (N) x Distance (M)

Question 3

Force applied to a spring (N)

Answer 3

Spring constant (N/m) x Extension (M)

Question 4

Distance travelled (m)

Answer 4

Speed (m/s) x Time (s)

Question 5

Acceleration (m/s^2)

Answer 5

Change in velocity (m/s) / Time (s)

Question 6

Resultant force (N)

Answer 6

Mass (Kg) x Acceleration (m/s^2)

Question 7

Momentum (kgm/s)

Answer 7

Mass (Kg) x Velocity (m/s)

Question 8

Kinetic Energy (J)

Answer 8

0.5 x Mass (Kg) x Velocity^2 (m/s)

Question 9

Gravitational Potential Energy (J)

Answer 9

Mass (Kg) x GFS (g) x Height (m)

GFS = Gravitational Field Strength

Question 10

Power (W)
Using Transfer

Answer 10

Energy Transfered (J) / Time (S)

Question 11

Efficiency (%)
Using Transfer of Energy

Answer 11

( Useful output energy transfered (J) /
Total input energy transfered (J) ) x 100

Question 12

Efficiency (%)
Using Power

Answer 12

( Useful power output (J) /
Total power output (J) ) x 100

Question 13

Wave speed (m/s)

Answer 13

Frequency (Hz) x Wavelength (m)

Question 14

Charge Flow (C)

Answer 14

Current (A) x Time (S)

Question 15

Potential difference (V)

Answer 15

Current (A) x Resistance (Ω)

Question 16

Power (W)
Using potential difference

Answer 16

Potential difference (V) x Current (A)

Question 17

Power (W)
Using current

Answer 17

Current² (A) x Resistance (Ω)

Question 18

Energy Transfered (J)
Using charge

Answer 18

Charge Flow (C) x Potential difference (V)

Question 19

Density (kg/m^3)

Answer 19

Mass (Kg) / Volume (m^3)

Question 20

Moment of a force (Nm)

Answer 20

Force (N) x Distance (m)

Question 21

Pressure (Pa)

Answer 21

Force (N) x Area (m^2)

Question 22

Power (W)
Using Work

Answer 22

Work Done (J) / Time (S)

Question 23

Energy transfered (J)

Answer 23

Power (W) x Time (S)