Equations

Question 1

speed

Answer 1

distance moved/time taken

Question 2

acceleration

Answer 2

change in velocity/time taken

Question 3

force

Answer 3

mass x acceleration

Question 4

weight

Answer 4

mass × gravitational field strength

Question 5

momentum

Answer 5

mass x velocity

Question 6

effciency

Answer 6

useful energy output/ total energy output

Question 7

gravitational potential energy

Answer 7

mass x gravity x height

Question 8

kinetic energy

Answer 8

1/2 x mass x speed squared

Question 9

energy transferred

Answer 9

work done or charge moved × potential diffrence

Question 10

wave speed

Answer 10

distance/ time or frequency × wavelength

Question 11

work done

Answer 11

force × distance moved

Question 12

power

Answer 12

work done / time taken or energy transferred/ time taken

Question 13

moment

Answer 13

force × perpendicular distance from the pivot

Question 14

charge

Answer 14

current × time

Question 15

potential diffrence

Answer 15

current × resistance

Question 16

electrical power

Answer 16

current × potential diffrence or (current) squared × resistance

Question 17

density

Answer 17

mass/ volume

Question 18

force exerted on a spring

Answer 18

spring constant × extension

Question 19

pressure

Answer 19

force / area