Equations

Question 1

What is the equation for density?

Answer 1

Density = mass

volume

Question 2

What is the equation for distance?

Answer 2

Distance travelled = speed x time

Question 3

What is the equation for acceleration?

Answer 3

Acceleration = change in velocity

time

Question 4

What is the equation for kinetic energy?

Answer 4

2

0.5 x mass x speed

Question 5

What is the equation for force?

Answer 5

Force = mass x acceleration

Question 6

What is the equation for momentum?

Answer 6

Momentum = mass x velocity

Question 7

What is the equation for work done?

Answer 7

Work done = force x distance

Question 8

What is the equation for power using work done?

Answer 8

Power = work done

time

Question 9

What is the equation for the force exerted by a spring?

Answer 9

Extension x spring constant

Question 10

What is the equation for weight?

Answer 10

Mass x gravitational field strength

Question 11

What is the equation for gravitational potential energy?

Answer 11

Potential energy = mass x height x gravitational field strength

Question 12

What is the equation for pressure?

Answer 12

Pressure = force normal to surface/ area of that surface

Question 13

What is the equation for a moment of a force?

Answer 13

Moment = force x distance (normal to direction of force)

Question 14

What is the equation for charge flow?

Answer 14

Charge = current x time

Question 15

What is the equation for resistance?

Answer 15

Resistance = potential difference

current

Question 16

What is the equation for energy transferred using charge?

Answer 16

Energy transferred = charge x potential difference

Question 17

What is the equation for power using resistance?

Answer 17

2

Power = current x resistance

Question 18

What is the equation for power using energy transferred?

Answer 18

Power = energy transferred / time

Question 19

What is the equation for wave speed?

Answer 19

Wave speed = frequency x wavelength

Question 20

What is the equation for efficiency?

Answer 20

Efficiency = useful output energy transfer/ input energy transfer x 100%

Question 21

SI unit of mass

Answer 21

Kg

Question 22

SI unit of length

Answer 22

M

Question 23

SI unit of density

Answer 23

3

Kg/m

Question 24

SI unit of volume

Answer 24

3

M

Question 25

SI unit of speed

Answer 25

M/s

Question 26

SI unit of time

Answer 26

S

Question 27

SI unit of acceleration

Answer 27

2 | m/s

Question 28

SI unit of force

Answer 28

N

Question 29

SI unit of kinetic energy

Answer 29

J

Question 30

SI unit of velocity

Answer 30

m/s

Question 31

SI unit of momentum

Answer 31

kgm/s

Question 32

SI unit of work done

Answer 32

J

Question 33

SI unit of power

Answer 33

W

Question 34

SI unit of extension

Answer 34

m

Question 35

SI unit of spring constant

Answer 35

N/m

Question 36

SI unit of gravitational field strength

Answer 36

N/kg

Question 37

SI unit of pressure

Answer 37

Pa OR N/m

Question 38

SI unit of a moment

Answer 38

Nm

Question 39

SI unit of charge

Answer 39

C

Question 40

SI unit of current

Answer 40

A

Question 41

SI unit of resistance

Answer 41

Ω

Question 42

SI unit of potential difference

Answer 42

V

Question 43

SI unit of frequency

Answer 43

Hz

Question 44

What is the equation for change in thermal energy using specific heat capacity?

Answer 44

mass x specific heat capacity x temperature change

Question 45

what is the SI unit for specific heat capacity

Answer 45

J/kg degrees C

Question 46

What does the greek letter delta mean? (it’s a triangle)

Answer 46

change in

Question 47

What is the equation for energy produced by an immersion heater?

Answer 47

energy = current x time x voltage

Question 48

what is the equation for thermal energy using specific latent heat?

Answer 48

energy = mass x specific latent heat

Question 49

What is the equation for pressure at a certain depth of liquid?

Answer 49

Height/depth x density of liquid x gravitational field strength

Question 50

What is the equation for the pressure difference at two points in a liquid

Answer 50

Depth difference of the two points x density of the liquid x gravitational field strength

Question 51

What is the equation for work done to stretch a spring?

Answer 51

Work done = 0.5 x spring constant x extension^2