Formulas

Question 1

Speed

Answer 1

Speed = distance / time

Question 2

Velocity

Answer 2

Velocity = displacement / time

Question 3

Acceleration

Answer 3

Acceleration = change in velocity / time

Question 4

Gradient

Answer 4

Gradient = acceleration

Question 5

Distance (velocity time graph)

Answer 5

Distance = area under graph

Question 6

Total force

Answer 6

Total force = mass x acceleration

Question 7

v2

Answer 7

v2 = u2 + 2as

Question 8

Weight

Answer 8

Mass x g

Question 9

Momentum

Answer 9

Momentum = mass x velocity

Question 10

Work

Answer 10

Work = energy transferred = force x distance

Question 11

GPE

Answer 11

GPE = mass x g x height

Question 12

KE

Answer 12

KE = 0.5 x mass x speed^2

Question 13

Efficiency

Answer 13

Efficiency = useful energy out / total energy input

Question 14

Wave speed

Answer 14

Wave speed = frequency x wavelength
Wave speed = distance / time

Question 15

For a lens, power = ?

Answer 15

Power = 1/focal length

Question 16

Frequency (Hz)

Answer 16

Frequency (Hz) = velocity (m/s) / wavelength (m)

Question 17

Force

Answer 17

Force = change in momentum / time

Question 18

Momentum before

Answer 18

Momentum before = momentum after

Question 19

Stopping distance

Answer 19

Stopping distance = thinking distance + braking distance

Question 20

Speed of sound through air

Answer 20

330m/s

Question 21

Speed of sound through water at 0C

Answer 21

1400m/s

Question 22

Speed of sound through concrete

Answer 22

5000m/s

Question 23

Frequency

Answer 23

Frequency = 1/time period