Units & Equations

Question 1

What is the equation relating speed, distance and time?

Answer 1

Distance = speed x time or Speed = distance / time

Question 2

What is the unit for speed?

Answer 2

m/s

Question 3

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

Answer 3

weight = mass x gravitational field strength

Question 4

What is the unit for weight?

Answer 4

N (it is a force)

Question 5

What is the unit for mass?

Answer 5

kg

Question 6

What is the equation relating work done, force and distance?

Answer 6

work done = force x distance

Question 7

What is the unit for work done?

Answer 7

J or Nm

Question 8

What is the equation relating force in a spring. spring constant and extension?

Answer 8

force = spring constant x extension

Question 9

What is the unit for force?

Answer 9

Newtons

Question 10

What is the equation that relates moment, force and distance?

Answer 10

Moment = force x distance

Question 11

What is the unit for moment?

Answer 11

Nm

Question 12

What is the equation relating pressure, force and area?

Answer 12

pressure = force / area

Question 13

What is the unit for pressure?

Answer 13

N/m2 or Pa

Question 14

What is the equation relating acceleration, change in velocity (speed) and time?

Answer 14

acceleration = change in speed / time taken

Question 15

What is the unit for acceleration?

Answer 15

m/s2

Question 16

What is the equation relating force, mass and acceleration?

Answer 16

force = mass x acceleration

Question 17

What is the equation relating momentum, speed and mass? (Higher Tier Only)

Answer 17

momentum = speed x mass

Question 18

What is the unit for momentum?

Answer 18

kgm/s

Question 19

What is the equation for kinetic energy?

Answer 19

kinetic energy = 1/2 x mass x speed^2

Question 20

What is the unit for kinetic energy?

Answer 20

J, Joules (all energy has units Joules)

Question 21

What is the equation for gravitational potential energy?

Answer 21

G.P.E = mass x gravity x height

Question 22

What is the unit for gravitational potential energy?

Answer 22

J

Question 23

What is the equation relating power, energy transferred and time?

Answer 23

Power = energy transferred / time

Question 24

What is the unit for power?

Answer 24

Watt, W

Question 25

What is the equation relating power, work done and time?

Answer 25

Power = work done / time or Work done = power x time

Question 26

What is the equation for efficiency?

Answer 26

efficiency = useful power/energy / total power/energy

Question 27

What is the equation relating wave speed, frequency and wavelength?

Answer 27

wave speed = wavelength x frequency

Question 28

What is the unit for wave speed?

Answer 28

m/s

Question 29

What is the unit for wavelength?

Answer 29

m

Question 30

What is the unit for frequency?

Answer 30

Hz

Question 31

What is the equation relating charge flow, current and time?

Answer 31

Charge flow = current x time

Question 32

What is the unit for charge flow?

Answer 32

Columbs, C

Question 33

What is the unit for current?

Answer 33

Amps, A

Question 34

What is the equation relating potential difference, current and resistance?

Answer 34

Potential difference = current x resistance

Question 35

What is the unit for potential difference?

Answer 35

Volts, V

Question 36

What is the unit for resistance?

Answer 36

Ohms

Question 37

What is the equation relating power, potential difference and current?

Answer 37

Power = potential difference x current

Question 38

What is the equation relating power, current and resistance?

Answer 38

Power = current^2 x resistance

Question 39

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

Answer 39

Energy transferred = power x time

Question 40

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

Answer 40

Energy transferred = potential difference x charge flow

Question 41

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

Answer 41

density = mass / volume

Question 42

What is the unit for density?

Answer 42

g/cm3 or kg/m3