EQUATIONS

Question 1

average speed =

Answer 1

average speed = distance / time

Question 2

force =

Answer 2

force = mass x acceleration

Question 3

acceleration =

Answer 3

acceleration = change in velocity / time

Question 4

momentum =

Answer 4

momentum = mass x velocity

Question 5

density =

Answer 5

density = mass / volume

Question 6

work done =

Answer 6

work done = force x distance moved

Question 7

energy transferred =

Answer 7

energy transferred = work done

Question 8

kinetic energy =

Answer 8

1/2 x mass x speed²

Question 9

gravitational potential energy =

Answer 9

gravitational potential energy = mass x gravity x height

Question 10

weight =

Answer 10

weight = mass x gravitational field strength

Question 11

pressure =

Answer 11

pressure = force / area

Question 12

moment =

Answer 12

moment = force × perpendicular distance from the pivot

Question 13

charge =

Answer 13

charge = current × time

Question 14

voltage =

Answer 14

voltage = current × resistance

Question 15

electrical power =

Answer 15

electrical power = voltage × current

Question 16

wave speed =

Answer 16

wave speed = frequency × wavelength

Question 17

primary voltage
————————– =
secondary voltage

Answer 17

primary voltage
————————– = primary turns / secondary turns
secondary voltage

Question 18

refractive index =

Answer 18

refractive index = sin i / sin r

Question 19

efficiency =

Answer 19

efficiency = useful energy output / total energy output

Question 20

pressure difference =

Answer 20

pressure difference = height × density × gravity

Question 21

input power =

Answer 21

input power = output power