Formulas

Question 1

Weight

Answer 1

W (N) = m (kg) x g (acceleration due to gravity : 10m/s2)

Question 2

Air Speed

Answer 2

S (m/s) = distance (m) ➗ time (s)

Question 3

Force

Answer 3

F (N) = mass (kg) x area (m2)

Question 4

Pressure

Answer 4

P (Pa) = force (N) ➗ area (m2)

Question 5

Turning point

Answer 5

Force (N) x perpendicular distance from pivot (m)

Question 6

Work done

Answer 6

Force (N) x distance moved in direction of force (m)

Question 7

Acid + Carbonate

Answer 7

Acid + Carbonate (__CO3) —> carbon dioxide (CO2) + water (H2O) + salt (aq)

Question 8

Acid + Metal

Answer 8

Acid + Metal —> hydrogen (H2) + salt (aq)

Question 9

Acid + Alkali

Answer 9

Acid + Alkali —> water (H2O) + salt (aq)

Question 10

Biomass

Answer 10

Biomass (g/m2) = total mass (g) ➗ area of habitat (m2)

Question 11

Ohm’s law

Answer 11

V (V) = I (A) x R (ohm)

Question 12

Series Resistance (effective resistance)

Answer 12

R total (ohm)= R1 + R2 …… + Rn

Question 13

Parallel Resistance (effective resistance)

Answer 13

1 ➗ R total = (1 ➗ R1) + (1➗ R2)…… + (1 ➗ Rn)

Question 14

Electrical energy

Answer 14

Electrical energy (kWh) = power (kW) x time (h)

Question 15

Electricity cost

Answer 15

Electricity tariff (cost per kWh) x electrical energy consumed (kWh)

Question 16

Density

Answer 16

P (kg/m3) = mass (kg) ➗ volume (m3)

Question 17

Gravitational Potential Energy

Answer 17

Gravitational Potential Energy (J) = mass (kg) x acceleration due to gravity (10 m/s^2 unless specified otherwise) x height (m)

Question 18

Celcius to Kelvin

Answer 18

Find Kelvin = Degree Celsius + 273
Find Degree Celsius = Kelvin - 273