Equations And Formulas P1-P8

Question 1

How do you calculate density (kg/m3)

Answer 1

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

Question 2

Calculating change in thermal energy (J) with specific heat capacity

Answer 2

Change in thermal energy (J) = mass(kg) ✖️SHC(J/kg°C) x change in temp (°c)

Question 3

Calculating thermal energy (J) with specific latent heat

Answer 3

Thermal energy (J)= mass(kg) x specific latent heat (J/Kg)

Question 4

1 mile = ?m

Answer 4

1609

Question 5

Calculating acceleration (m/s2)

Answer 5

acceleration (m/s2) = change in velocity (m/s) ➗ time (s)

Question 6

Calculating velocity from a graph

Answer 6

Velocity = change in displacement ➗ time

Question 7

Equation of motion

Answer 7

(Final velocity)2 - (initial velocity)2 = 2 x acceleration x distance

Question 8

Calculating KE

Answer 8

KE(J) = 0.5 x mass(kg) x (speed)2

Question 9

Calculating speed from KE

Answer 9

Speed = ✔️(KE) ➗(0.5 x mass)

Question 10

Calculating force (Newton’s second law)

Answer 10

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

Question 11

Calculating momentum (Kgm/s2)

Answer 11

Momentum (Kgm/s2) = mass (kg) x velocity (m/s)

Question 12

Why does Joules = Nm

Answer 12

1N = 1kgm/s2

1Nm = 1Kgm/s2 x m
= 1Kgm2/s2

Question 13

Calculating power

Answer 13

Power (W) = work done (J) ➗ time (s)

Question 14

Calculating force exerted by a spring (N)

Answer 14

Force (N) = Spring constant (N/m) x extension (m)

Question 15

Calculating spring constant

Answer 15

Spring constant = force ➗extension

Question 16

Calculating energy transferred in stretching a spring (J)

Answer 16

0.5 x spring constant (N/m) x (extension)2 (m)

Question 17

Calculating gravity force (N)

Answer 17

Force (N) = mass (kg) x gravitational field strength (N/Kg)

Question 18

Calculating weight

Answer 18

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

Question 19

Calculating the acceleration due to gravity

Answer 19

Resultant force (N) = mass(Kg) x acceleration due to gravity (m/s2)

Question 20

Calculating gpe (J)

Answer 20

Gpe (J) = mass (kg) x height (m) x gravitational field strength (N/Kg)

Question 21

Calculating charge flow

Answer 21

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

Question 22

Calculating current

Answer 22

Current = charge ➗ time

Question 23

Calculating energy transferred in circuits

Answer 23

Energy transferred (J) = p.d (v) x charge (C)

Question 24

Calculating resistance

Answer 24

Resistance (ohms) = p.d (v) ➗ current (A)

Question 25

Calculating electrical power

Answer 25

Power (W) = p.d (V) x current (A)

Question 26

Calculating power from current and resistance

Answer 26

Power = current2 x resistance

Question 27

Calculating the force on a conductor carrying a current

Answer 27

Force (N) = magnetic flux density (T) x current (A) x length (m)

Question 28

How do you calculate frequency

Answer 28

Frequency = wave speed ➗ wavelength

Question 29

How do you calculate wave velocity

Answer 29

Wave velocity (m/s) = frequency x wavelength

Question 30

How do you calculate nuclear energy

Answer 30

Energy = mass x (velocity)2

Question 31

Calculating work done

Answer 31

Work done = force x distance

Question 32

How do you calculate change in height

Answer 32

V2 ➗ 2g

Question 33

Calculating efficiency

Answer 33

Efficiency = useful output energy ➗ input energy