Physics Equations and Units

Question 1

What is the equation that links mass, gravitational field strength and weight?

Answer 1

weight = mass x gravitational field strength W = m x g

Question 2

What is the equation that links work done, force and distance?

Answer 2

Work done = force x distance W = F x s

Question 3

What is the equation that links force applied to a spring, spring constant and the extension?

Answer 3

Force applied to a spring = spring constant x extension F = k x e

Question 4

What is the equation that links distance, speed and time

Answer 4

distance = velocity x time s = v x t

Question 5

What is the equation that links acceleration, chance in velocity and time taken?

Answer 5

acceleration = chance in velocity / time a = (v-u)÷t

Question 6

What’s the equation that links resultant force, mass and acceleration?

Answer 6

resultant force = mass x acceleration F = m x a

Question 7

What’s the equation that links momentum, mass and velocity? (Higher only)

Answer 7

momentum = mass x velocity p = m x v

Question 8

What is the equation that links kinetic energy, mass and velocity?

Answer 8

kinetic energy = 0.5 x mass x (velocity)² E_k=0.5 x m x v²

Question 9

What is the equation that links gravitational potential energy, mass, gravitational field strength and height?

Answer 9

gravitational potential energy = mass x gravitational field strength x height E_p = m x g x h

Question 10

What is the equation that links power, energy transferred and time?

Answer 10

power = energy transferred / time P = E ÷ t

Question 11

What is the equation that links power, work done and time?

Answer 11

power = work done / time P = W ÷ t

Question 12

What is the equation that links efficiency, useful energy transfer and total input energy transfer?

Answer 12

Efficiency = useful output energy ÷ total energy input

Question 13

What is the equation that links efficiency, useful power output and total power input?

Answer 13

efficiency = total power output ÷ total power input

Question 14

What is the equation that links wave speed, frequency and wavelength?

Answer 14

wave speed = frequency x wavelength v = f x λ

Question 15

What is the equation that links charge flow, current and time?

Answer 15

charge flow = current x time Q = I x t

Question 16

What is the equation that links potential difference, current and resistance?

Answer 16

potential difference = current x resistance V = I x R

Question 17

What is the equation that links power, potential difference and current?

Answer 17

Power = potential difference x current P = V x I

Question 18

What is the equation that links power, current and resistance?

Answer 18

Power = (current)² x resistance P = I² x R

Question 19

What is the equation that links energy transferred, power and time?

Answer 19

energy transferred = power x time E = P x t

Question 20

What is the equation that links energy transferred, charge flow and potential difference?

Answer 20

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

Question 21

What is the equation that links density, mass and volume?

Answer 21

density = mass ÷ volume (p = m ÷ v)

Question 22

What is the unit of weight?

Answer 22

Newtons (N)

Question 23

What is the unit of mass?

Answer 23

kilograms (kg)

Question 24

What is the unit of gravitational field strength?

Answer 24

Newtons per kilogram (N/kg)

Question 25

What is the unit of work done?

Answer 25

Joules (J)

Question 26

What is the unit of force?

Answer 26

Newtons (N)

Question 27

What is the unit of distance?

Answer 27

metres (m)

Question 28

What is the unit of velocity?

Answer 28

metres per second (m/s)

Question 29

What is the unit of time?

Answer 29

seconds (s)

Question 30

What is the unit of acceleration?

Answer 30

metres per second² (m/s²)

Question 31

What is the unit of momentum?

Answer 31

Nm/s

Question 32

What is the unit of kinetic energy?

Answer 32

Joules (J)

Question 33

What is the unit of gravitational energy?

Answer 33

Joules (J)

Question 34

What is the unit of height?

Answer 34

metres (m)

Question 35

What is the unit of power?

Answer 35

Watts (W)

Question 36

What is the unit of wave speed?

Answer 36

metres per second (m/s)

Question 37

What is the unit of frequency?

Answer 37

Hertz (Hz)

Question 38

What is the unit of wavelength?

Answer 38

metres (m)

Question 39

What is the unit of charge flow?

Answer 39

Coulombs (C)

Question 40

What is the unit of current?

Answer 40

Amperes (A)

Question 41

What is the unit of potential difference?

Answer 41

Volts (V)

Question 42

What is the unit of resistance?

Answer 42

Ohms (Ω)

Question 43

What is the unit of density?

Answer 43

kilograms per metre³ (kg/m³)