Equations

Question 1

Average speed

Answer 1

distance moved / time taken

Question 2

Acceralation

Answer 2

acceleration= (change in velocity) / (time taken)

a= (v-u) / t

Question 3

force

Answer 3

force= mass × acceleration

F = m × a

Question 4

weight

Answer 4

weight = mass × gravitational field strength

W = m × g

Question 5

momentum

Answer 5

momentum = mass × velocity

p = m × v

Question 6

moment

Answer 6

moment= force × perpendicular distance from the pivot

Question 7

wave speed

Answer 7

wave speed = frequency × wavelength

v = f × λ

Question 8

efficiency

Answer 8

efficiency = (useful energy output) / (total energy input)

Question 9

work done

Answer 9

Work done = force × distance moved

W = F × d

Question 10

gravitational potential energy

Answer 10

Gravitational potential energy = mass × g × height

GPE = m × g × h

Question 11

kinetic energy

Answer 11

kinetic energy = 1/2 × mass × speed^2

KE = 1/2 × m × v^2

Question 12

energy transferred

Answer 12

energy transferred = work done

Question 12

energy transferred

Answer 12

energy transferred = work done

Question 13

density

Answer 13

density = mass / volume

ρ = m / V

Question 14

pressure

Answer 14

pressure = force / area

p = F / A

Question 15

pressure difference

Answer 15

pressure difference = height × density × g

p = h × ρ × g