Physics GCSE Equations NTK

Question 1

Link speed, distance travelled and time taken​

Answer 1

Distance travelled = average speed x time​

Time = distance ÷ speed​

Speed = distance ÷ time​

Distance travelled - metres​
Time - seconds​
Speed - metres per second or m/s

Question 2

Link acceleration, change in speed and time taken

Answer 2

Acceleration = change in speed ÷ time​

Time taken = change in speed ÷ acceleration​

Change in speed = acceleration x time​

Acceleration - metres per second squared​
Time taken - seconds​
Change in speed - metres per second

Question 3

Link force mass and acceleration

Answer 3

Force = mass x acceleration​

Mass = force ÷acceleration​

Acceleration = force ÷ mass​

Force - Newtons​
Mass - kilograms​
Acceleration - metres per second squared

Question 4

Link weight mass and gravitational field strength

Answer 4

Weight = mass x Gravitational field strength​

Mass = weight ÷ gfs​

Gfs = weight ÷ mass​

Weight - Newtons​
Mass - kilograms​
GFS - Newtons per kilogram or metres per second squared

Question 5

Link efficiency, energy supplied and useful energy transferred

Answer 5

Efficiency = useful energy transferred by the device​ ÷ energy supplied to the device​

Energy supplied = useful energy transferred ​÷ efficiency​

Useful energy transferred = energy supplied x efficiency​

Efficiency - no unit or expressed as a percentage​

Energy supplied - Joules​

Useful energy transferred - Joules

Question 6

Link mass, velocity and momentum

Answer 6

Momentum = mass x velocity​

Mass = momentum ÷ velocity​

Velocity = momentum ÷ mass​

Momentum - kg m/s​
Mass - kg​
Velocity - m/s

Question 7

Link frequency, wavelength and wave speed

Answer 7

Wave speed = frequency x wavelength​

Frequency = wave speed ÷ wavelength​

Wavelength = wave speed ÷ frequency​

Wave speed - m/s​
Frequency - Hertz, Hz or per second​
Wavelength - metres

Question 8

Link wave speed, distance travelled and time taken

Answer 8

Wave speed = distance travelled ÷ time taken​

Distance travelled = wave speed x time​

Time = distance travelled ÷ wave speed​

Wave speed - m/s​
Distance travelled - metres​
Time - seconds

Question 9

Link mass volume and density

Answer 9

Density = mass ÷ volume​

Mass = volume x density​

Volume = mass ÷ density​

Density - kg/m3​
Mass - kilograms​
Volume - m3 (cubic metres)

Question 10

Link work done , force and distance travelled in the direction of the force

Answer 10

Work done = force x distance moved in the direction of the force​

Force = work done ÷ distance moved​

Distance moved = wd ÷force​

Work done - Joules​
Force - Newtons ​
Distance moved - metres

Question 11

Link gravitational field strength, gravitational potential energy, mass and change in height

Answer 11

GPE = mass x g x change in height​

Mass = GPE ÷ ( g x Δ h)​

g = GPE ÷ ( mass x Δ h)​

Δ h = GPE ÷ ( mass x g)​

GPE - Joules​
Mass - kilograms​
g - m/s2 or N/kg​
Δ h - metres

Question 12

Link kinetic energy, mass and velocity

Answer 12

Kinetic energy = ½ x mass x velocity2​

Mass = 2 x KE ÷ velocity2​

Velocity = square root of (2 x KE ÷ mass)​

Kinetic energy - Joules​
Mass - kilograms​
Velocity - m/s

Question 13

Link power, energy(Work Done) and time taken

Answer 13

Power = work done ÷ time taken​

Work done = power x time​

Time = work done ÷ power​

Power - Watts​
Work done - Joules​
Time - seconds

Question 14

Link charge, potential difference and energy transferred

Answer 14

Energy transferred = charge moved x potential difference​

Charge = energy ÷ pd​

pd = energy transferred ÷ charge​

Energy transferred - Joules​
Charge - Coulombs​
pd - Volts (not voltage)

Question 15

Link current, charge and time

Answer 15

Charge = current x time​

Current = charge ÷ time​

Time = charge ÷ current​

Charge - Coulombs​
Current - Amps​
Time - seconds

Question 16

Link potential difference, current and resistance

Answer 16

Potential difference = current x resistance​

Current = pd ÷ resistance​

Resistance = pd ÷ current​

Potential difference - Volts​
Current - Amps​
Resistance - Ohms Ω

Question 17

Link power, energy transferred and time taken

Answer 17

Power = energy transferred ÷ time taken​

Energy transferred = power x time​

Time = energy ÷ power​

Power - Watts​
Energy - transferred Joules​
Time - seconds

Question 18

Link power current and potential difference

Answer 18

Electrical power = current x potential difference​

Current = power ÷ pd​

pd = power ÷ current​

Electrical power - Watts​
Current - Amps​
pd - Volts

Question 19

Link force, spring constant and extension

Answer 19

Force = spring constant x extension ​

Spring constant = force ÷ extension​

Extension = force ÷ spring constant​

Force - Newtons​
Spring constant - N/m​
Extension - metres

Question 20

Link moment, perpendicular force and distance from pivot

Answer 20

Moment = force x distance normal to the direction of the force​

Force = moment ÷ distance​

Distance = moment ÷ force​

Moment - Nm or Newton metre​
Force - Newton ​
Distance - metre

Question 21

Link pressure, force and area

Answer 21

Pressure = force normal to the area ÷ area​

Force = pressure x area ​

Area = force ÷ pressure​

Pressure - Pascals Pa N/m2​
Force - Newtons ​
Area - m2

Question 22

Link power, current and resistance

Answer 22

Electrical Power = Current² x resistance

Current = √(Power ÷ resistance

Resistance = power ÷ current²

Electrical power - Watts
Current - Amps
Resistance - Ohms