Equations

Question 1

distance travelled =

Answer 1

speed x time

Question 2

acceleration =

Answer 2

change in velocity / time taken

Question 3

force =

Answer 3

mass x acceleration

Question 4

weight =

Answer 4

mass x gravitational field strength

Question 5

momentum =

Answer 5

mass x velocity

Question 6

change in GPE =

Answer 6

mass x gravitational field strength x change in vertical height

Question 7

kinetic energy

Answer 7

1/2 x mass x velocity^2

Question 8

efficiency =

Answer 8

useful energy transferred by device / total energy supplied by device

Question 9

wave speed =

Answer 9

frequency x wavelength

Question 10

wave speed (2) =

Answer 10

distance / time

Question 11

work done =

Answer 11

force x distance moved in the direction of the force

Question 12

power =

Answer 12

work done / time taken

Question 13

energy transferred =

Answer 13

charge moved x potential difference

Question 14

charge =

Answer 14

current x time

Question 15

potential difference =

Answer 15

current x resistance

Question 16

power =

Answer 16

energy transferred / time taken

Question 17

electrical power =

Answer 17

current x potential difference

Question 18

electrical power (2) =

Answer 18

current^2 x resistance

Question 19

density =

Answer 19

mass / volume

Question 20

force exerted on a spring =

Answer 20

spring constant x extension

Question 21

final velocity^2 - initial velocity^2 =

Answer 21

2 x acceleration x distance

Question 22

force =

Answer 22

change in momentum / time

Question 23

energy transferred (2) =

Answer 23

charge x potential difference x time

Question 24

force on a conductor at right angles to a magnetic field carrying a current =

Answer 24

magnetic flux density x current x length

Question 25

pd across primary coil x current in primary coil =

Answer 25

pd across secondary coil x current in secondary coil

Question 26

change in thermal energy =

Answer 26

mass x specific heat capacity x change in temperature

Question 27

thermal energy for a change of state =

Answer 27

mass x specific latent heat

Question 28

energy transferred in stretching =

Answer 28

1/2 x spring constant x extension^2

Question 29

moment of a force =

Answer 29

force x distance normal to the direction of the force

Question 30

pressure =

Answer 30

force normal to surface / area of surface

Question 31

pd across primary coil / pd across secondary coil =

Answer 31

number turns in primary coil / number of turns in secondary coil

Question 32

pressure 1 x volume 1 =

Answer 32

pressure 2 x volume 2

Question 33

pressure due to a column of liquid =

Answer 33

height of column x density of liquid x gravitational field strength