Equations

Question 1

speed equation

Answer 1

speed = distance / time

Question 2

force equation

Answer 2

force = mass x acceleration

Question 3

weight equation

Answer 3

weight = mass x gravitational field strength (10)

Question 4

momentum equation

Answer 4

mass x velocity

Question 5

moment equation

Answer 5

moment = force x perpendicular distance from pivot

Question 6

charge equation

Answer 6

charge = current x time

Question 7

voltage equation

Answer 7

voltage = current x resistance

Question 8

electrical power equation

Answer 8

electrical power = voltage x current

Question 9

energy transferred equation

Answer 9

energy transferred = charge x voltage

Question 10

pressure equation

Answer 10

pressure = force / area

Question 11

pressure difference equation

Answer 11

pressure difference = height x density x gravitational field strength

Question 12

density equation

Answer 12

density = mass / volume

Question 13

change in wavelength / reference wavelength =

Answer 13

velocity of a galaxy / speed of light

Question 14

kinetic energy equation

Answer 14

kinetic energy = 1/2 x mass x velocity2

Question 15

gravitational potential energy equation

Answer 15

GPE = mass x grav. field strength x height

Question 16

work done equation

Answer 16

work done + force x distance

Question 17

efficiency =

Answer 17

useful energy output / total energy input x 100

Question 18

primary voltage / secondary voltage =

Answer 18

primary turns / secondary turns

Question 19

input power =

Answer 19

output power

Question 20

wave speed equation

Answer 20

wave speed = frequency x wavelength

Question 21

n =

Answer 21

sin I / sin r

Question 22

sin c =

Answer 22

1/n

Question 23

acceleration equation

Answer 23

change in velocity / time taken