word equations

Question 1

weight

Answer 1

mass x gravitational field strength

Question 2

work done

Answer 2

force x distance

Question 3

force applied to a spring

Answer 3

spring constant x extension

Question 4

distance travelled

Answer 4

speed x time

Question 5

acceleration

Answer 5

change in velocity / time taken

Question 6

resultant force

Answer 6

mass x acceleration

Question 7

momentum

Answer 7

mass x velocity

Question 8

kinetic energy

Answer 8

0.5 x mass x velocity squared

Question 9

gravitational potential energy

Answer 9

mass x gravitational field strength x height

Question 10

power

Answer 10

energy transferred / time

OR

work done / time

OR

potential difference x current

OR

current squared x resistance

Question 11

wave speed

Answer 11

frequency x wavelength

Question 12

efficiency

Answer 12

useful power output / total power output

OR

useful output energy transfer / useful input energy transfer

Question 13

change flow

Answer 13

current x time

Question 14

potential difference

Answer 14

current x resistance

Question 15

energy transferred

Answer 15

power x time

OR

charge flow x potential difference

Question 16

density

Answer 16

mass / volume