Physics Equations AQA GCSE 2022 ONLY

Question 1

What are the units for:

Kinetic energy = 1/2 x mass x speed^2
Ek = 1/2 x m x v^2

Answer 1

Kinetic energy = J
Mass = Kg
Speed = m/s

Question 2

What are the units for:

GPE = mass x gravitational field strength x height 
Ep = m x g x h

Answer 2

GPE = J
Mass = Kg
Gravitational field strength = N/kg
Height = m

Question 3

What are the units for:

Elastic potential energy = 1/2 x spring constant x extension^2
Ee = 1/2 x k x e^2

Answer 3

Ee = J
Spring constant = (N/m)
Extension = m

Question 4

What are the units for:

Power = work done / time
P = W/t

Answer 4

Power = W (watts)
Work done = J
Time = s

Question 5

What are the units for:

Power = energy transferred / time
P = E/t

Answer 5

Power = W (watts)
Energy transferred = J
Time = s

Question 6

What are the units for:

Efficiency = useful energy output / total energy input 
Efficiency = useful power output / total power output

Answer 6

Efficiency = %
Power = W
Energy = J

Question 7

What are the units for:

Change in thermal energy = mass x specific heat capacity x temperature change
🔺E = m x c x 🔺Ø

Answer 7

Change in thermal energy = J
Mass = Kg
Specific Heat Capacity = J/Kg°C
Temp change = °C

Question 8

What are the units for:

Charge flow = current x time
Q = I x t

Answer 8

Charge flow = C (coulomb)
Current = A (amps)
Time = s

Question 9

What are the units for:

Potential difference = current x resistance
V = I x R

Answer 9

Potential difference = V (volts)
Current = A (amps)
Resistance = Ω Ohms

Question 10

Total resistance equation + units?

Series

Answer 10

Total resistance = resistance of component 1 + resistance of component 2

RT = R1 + R2

Resistance = Ω Ohms

Question 11

Total resistance equation + units?

Parallel

Answer 11

1/Rt = 1/R1 + 1/R2 + 1/R3

Resistance = Ω Ohms

Question 12

What are the units for:

Power = current x potential difference
P =I x V

Answer 12

Power = W
Current = A (amps)
Potential difference = V

Question 13

What are the units for:

Power = current^2 x resistance 
P = I^2 x R

Answer 13

Power = W
Current = A
Resistance = Ω Ohms

Question 14

What are the units for:

Energy transferred = power x time
E = P x t

Answer 14

Energy = J
Power = W
Time = s

Question 15

What are the units for:

Energy transferred = charge flow x potential difference
E = Q x V

Answer 15

Energy transferred = J
Charge flow = A
Potential difference = V

Question 16

What are the units for:

Density = mass / volume
P = m / v

Answer 16

Density = g/cm^3
Mass = g
Volume = cm^3

OR

Density = kg/m^3
Mass = kg
Volume = m^3

Question 17

What are the units for:

Change in thermal energy = mass x specific heat capacity x temperature change
🔺E = m x c x 🔺Ø

Answer 17

Change in thermal energy = J
Mass = Kg
Specific Heat Capacity = J/Kg°C
Temp change = °C

Question 18

What are the units for:

Thermal energy for a change in state = mass x specific latent heat
E = m x L

Answer 18

Thermal energy for state change = J
Mass = kg
Specific latent heat = J / kg

Question 19

Boyles law + units

Answer 19

P1 x V1 = P2 x V2

Pressure = Pa (pascal)
Volume = cm^3 OR m^3

Question 20

What are the units for:

For a gas = pressure x volume = constant

Answer 20

Pressure = Pa (pascal)
Volume = cm^3 OR m^3

Question 21

What are the units for:

Wave speed = frequency / wavelength
v = f x

Answer 21

Wave speed = m/s
Wavelength = m
Frequency = Hz

Question 22

What are the units for:

Time period = 1 / frequency
T = 1/f

Answer 22

Time period = s

Frequency = Hz

Question 23

Be aware of this equation:

Magnification = image height / object image 
M = h-image/ h-object

Answer 23

-

Question 24

What are the units for:

Weight = mass x gravitational field strength

Answer 24

Weight = N
Mass = kg
Gravitational field strength = N/kg

Question 25

What are the units for: Work done = force x distance W = F x s

Answer 25

``` Work = J Force = N Distance = m ```

Question 26

What are the units for: Hookes Law Force = spring Constance x extension F = k x e

Answer 26

Force = N Spring constant = N/m Extension = m

Question 27

What are the units for: Moment of a force = force x distant M = F x d

Answer 27

Perpendicular to the direction of teh force Moment of a force = Nm Distance = m Force = N

Question 28

What are the units for: ``` Pressure = force normal to a surface / area of that surface P = F / A ```

Answer 28

``` Pressure = N/m^2 Force = N Area = m^2 ```

Question 29

What are the units for: Distance traveled = speed x time

Answer 29

``` Distance = m Speed = m/s Time = s ```

Question 30

What are the units for: ``` Acceleration = change in velocity / time taken a = 🔺v / t ``` ``` Acceleration = final - initial velocity / time taken a = v - u / t ```

Answer 30

``` Acceleration = m/s^2 Velocity = m/s Time = s ```

Question 31

What are the units for: Resultant force = mass x acceleration F = m x a

Answer 31

Resultant force = N Mass = kg Acceleration = m/s^2

Question 32

What are the units for: ``` Momentum = mass x velocity P = m x v ```

Answer 32

``` Momentum = kg m/s Mass = kg Velocity = m/s ```

Question 33

What are the units for: ``` Pressure = height of column x density of liquid x gravitational field strength p = h x p x g ```

Answer 33

``` Pressure = Pa Height = m Density = kg/m^3 GFS = N/kg ```

Question 34

What are the units for: Final velocity^2 - initial velocity ^2 = 2 x acceleration x distance V^2-u^2 = 2 x a x s

Answer 34

``` Velocity = m/s Acceleration = m/s^2 Distance = m ```

Question 35

What are the units for: Force =Change in momentum / time taken F = m🔺v / t

Answer 35

``` Force = N Momentum = kg m/s Time = s ```