Equations

Question 1

Speed

Answer 1

s=d/t speed=distance÷time

Question 2

Velocity

Answer 2

v=s/t
Velocity =
displacement ÷ time

Question 3

How do you find speed in a distance/time graph by deceleration

Answer 3

by drawing a tangent and a right angle

Question 4

acceleration

Answer 4

a=(v-u)
t

u is initial velocity (starting)
v is final velocity

Question 5

From velocity time graph how do you find the distance

Answer 5

Break the graph into triangles and squares and then find area of each bit then add it all up

Question 6

Stopping distance

Answer 6

Stopping distance =
thinking distance + braking distance

Question 7

Weight

Answer 7

w = m x g

units = n/kg

Question 8

Momentum

Answer 8

Momentum = mass (kg) x velocity (m/s)

Question 9

kinetic energy

Answer 9

K.E = 1/2 x m x v²

Question 10

△GPE

Answer 10

△GPE = m x g x △h

Question 11

Energy efficiency

Answer 11

useful energy transferred ÷total energy supplied

Question 12

Change in momentum

Answer 12

force x time

Question 13

Force

Answer 13

mass x acceleration

Question 14

Work done

Answer 14

force x distance moved in the direction of the force

Question 15

Frequency

Answer 15

speed/wavelength

Question 16

Power

Answer 16

Power = energy transferred/time
or
Power = work done/time