Question 1

total distance ÷ total time

Accepted Answer

average speed

Question 2

mass x acceleration

Accepted Answer

force

Question 3

mass x velocity

Accepted Answer

momentum

Question 4

mass ÷ volume

Accepted Answer

density

Question 5

useful energy output ÷ total energy input (x 100 %)

Accepted Answer

efficiency

Question 6

force x distance moved in direction of force

Accepted Answer

work done

Question 7

= work done

Accepted Answer

energy transferred

Question 8

½ x mass x velocity²

Accepted Answer

kinetic energy

Question 9

mass x gravitational field strength x change in height

Accepted Answer

change in gravitational potential energy

Question 10

mass x gravitational field strength

Accepted Answer

weight

Question 11

force ÷ area

Accepted Answer

pressure

Question 12

force x perpendicular distance from pivot

Accepted Answer

moment

Question 13

current x time

Accepted Answer

charge

Question 14

current x resistance

Accepted Answer

voltage

Question 15

voltage x current

Accepted Answer

electrical power

Question 16

frequency x wavelength

Accepted Answer

wave speed

Question 17

= output power (Vs x Is)

Accepted Answer

input power (Vp x Ip)

Question 18

Np ÷ Ns

Accepted Answer

Vp ÷ Vs

Question 19

sin i ÷ sin r

Accepted Answer

Refractive index n

Question 20

1 ÷ n

Accepted Answer

sin c

Question 21

height x density x g

Accepted Answer

pressure difference

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