Equations

Question 1

Density (kg/m3)

Answer 1

Mass (kg) / Volume (m3)

Question 2

Distance travelled (m)

Answer 2

Speed (m/s) x Time (s)

Question 3

Acceleration (m/s2)

Answer 3

Δ Velocity (m/s) / Time (s)

Question 4

Kinetic energy (J)

Answer 4

1/2 x Mass (kg) x Speed2 (m/s)2

Question 5

Force (N)

Answer 5

Mass (kg) x Acceleration (m/s2)

Question 6

Work done (J)

Answer 6

Force (N) x Distance (m)

Question 7

Power (W)

Answer 7

Work done (J) / Time (s)

Question 8

Momentum (kgm/s)

Answer 8

Mass (kg) x Velocity (m/s)

Question 9

Pressure (Pa)

Answer 9

Force (N) / Area (m2)

Question 10

Weight/gravity force (N)

Answer 10

Mass (kg) x GFS g (N/kg)

Question 11

GPE (J)

Answer 11

Mass (kg) x Height (m) x g (N/kg)

Question 12

Moment (Nm)

Answer 12

Force (N) x Distance (m)

Question 13

Charge (C)

Answer 13

Current (A) x Time (s)

Question 14

Potential energy (V)

Answer 14

Current (A) x Resistance (Ω)

Question 15

Energy transferred (J)

Answer 15

Charge (C) x P.d (V)

Question 16

Power (W)

Answer 16

P.d (V) x Current (A)

Question 17

Power (W)

Answer 17

Current2 (A)2 x Resistance (Ω)

Question 18

Energy transferred (J or kWh)

Answer 18

Power (W or kW) x Time (s or h)

Question 19

Wave speed (m/2)

Answer 19

Freq (Hz) x Wavelength (m)

Question 20

Efficiency

Answer 20

Useful output energy (J) / Input energy (J)

Question 21

Stopping distance (m)

Answer 21

Thinking distance (m) + Braking distance (m)