EQUATIONS

Question 1

density (kg/m³)

Answer 1

mass (kg)/volume (m³) ρ = m/V

Question 2

speed (m/s)

Answer 2

distance/time v = s/t

Question 3

acceleration (m/s²)

Answer 3

change in velocity (m/s)/time(s) a = (v-u)/t

Question 4

kinetic energy (J)

Answer 4

0.5 × mass (kg) × (speed (m/s))² KE = ½ mv²

Question 5

force (N)

Answer 5

mass (kg) × acceleration (m/s²) F = ma

Question 6

work done (J)

Answer 6

force (N) × distance (m) (along the line of action of the force) WD = F x D

Question 7

power (W)

Answer 7

work done (J)/time(s) P = WD / t

Question 8

momentum (kg m/s)

Answer 8

mass (kg) × velocity (m/s) p = mv

Question 9

weight or gravity force (N)

Answer 9

mass (kg) × gravitational field strength, g (N/kg) F = W = mg

Question 10

potential energy (J)

Answer 10

mass (kg) × height (m) × gravitational field strength, g (N/kg) GPE = mgh

Question 11

pressure (Pa)

Answer 11

force (N) / area (m²)

Question 12

moment of a force (Nm)

Answer 12

force (N) x distance (m) (normal to the direction of the force)

Question 13

charge flow (C)

Answer 13

current (A) × time (s) Q = It

Question 14

energy transferred (J)
(electricity)

Answer 14

charge (C) × potential difference (V) E = QV

Question 14

potential difference (V)

Answer 14

current (A) × resistance (Ω) V = IR

Question 14

power (W)
(ELECTRICITY)

Answer 14

potential difference (V) × current (A) = (current (A))² × resistance (Ω)
P = IV = I²R

Question 15

energy transferred (J, kWh)

Answer 15

power (W, kW) × time (s, h) E = Pt

Question 16

force on a conductor (at right angles to a magnetic field) carrying a current (N)

Answer 16

magnetic field strength (T) × current (A) × length (m) F = BIL

Question 17

potential difference across primary coil (V) / potential difference across secondary coil (V)

Answer 17

number of turns in primary coil / number of turns in secondary coil V₁V₂ = N₁N₂

Question 18

energy transferred in stretching (J)

Answer 18

0.5 × spring constant (N/m) × (extension (m))² E = ½ ke²

Question 19

SUVAT EQUATIONS:

Answer 19

v = u + at
s = ut + ½at²
v² = u² + 2as
s = (v+u)/2 x t
s = vt - ½at²

Question 20

pressure due to column of liquid (Pa)

Answer 20

height of column (m) x density of liquid (kg/m³) x g (N/kg)

Question 21

thermal energy for a change in state (J)

Answer 21

mass (kg) × specific latent heat (J/kg) E = mL

Question 22

change in thermal energy (J)

Answer 22

mass (kg) × specific heat capacity (J/kg°C) × change in temperature (°C) E = mCΔT