All formula to be memorised

Question 1

Density

Answer 1

Density (kg/m3) = mass (kg) / volume (m3)

Question 2

Distance travelled

Answer 2

Distance travelled (m) = speed (m/s) x time (s)

Question 3

Acceleration

Answer 3

Acceleration (m/s2) = change in velocity (m/s) / time (s)

Question 4

Kinetic energy

Answer 4

Kinetic energy (J) = 0.5 x mass (kg) x speed squared (m/s)

Question 5

Resultant force

Answer 5

Force (N) = mass (kg) x acceleration (m/s2)

Question 6

Work done

Answer 6

Work done (J) = force (N) x distance (m)

Question 7

Power

Answer 7

Power (W) = work done (J) / time (s)

Question 8

Momentum

Answer 8

Momentum (kgm/s) = mass (kg) x velocity (m/s)

Question 9

Pressure

Answer 9

Pressure (Pa) = force (N) / area (m2)

Question 10

Weight

Answer 10

Weight = gravity force = mass (kg) x gravitational field strength (N/kg)

Question 11

Potential energy

Answer 11

Potential energy (J) = mass (kg) x height (m) x gravitational field strength (N/kg)

Question 12

Moment of a force

Answer 12

Moment of a force (Nm) = force (N) x distance normal to the direction of the force (m)

Question 13

Charge flow

Answer 13

Charge flow (C) = current (A) x time (s)

Question 14

Potential difference

Answer 14

Potential difference (V) = current (A) x resistance (Ohms)

Question 15

Energy transferred

Answer 15

Energy transferred (J) = charge (C) x potential difference (V)

Question 16

Power (P3)

Answer 16

Power (W) = potential difference (V) x current (A) = current squared (A) x resistance (Ohms)

Question 17

Energy transferred (2)

Answer 17

Energy transferred (J, kWh) = power (W, kW) x time (s, h)

Question 18

Wave speed

Answer 18

Wave speed (m/s) = frequency (Hz) x wavelength (m)

Question 19

Efficiency

Answer 19

Efficiency = useful output energy transfer (J) / input energy transfer (J)

Question 20

Stopping distance

Answer 20

Stopping distance (m) = thinking distance (m) + breaking distance (m)

Question 21

1mA

Answer 21

1A x 10 the power of -3