P9.2 Velocity And Acceleration

Question 1

Difference between distance travelled and displacement

Answer 1

Distance travelled - scalar
Displacement - vector

Question 2

Difference between speed and velocity

Answer 2

Speed is the rate of change of distance
Velocity is speed in a given direction

Question 3

What is acceleration

Answer 3

The change of velocity per second = m/s^2

Question 4

How do you work out acceleration

Answer 4

Acceleration (m/2^2] =

Time taken for the change (s)

Question 5

Work equation for acceleration

Answer 5

a = v - u
——–
t

Question 6

How do i work out decceleration

Answer 6

Same as acceleration except it is opposite (negative), or if acceleration is negative it is positive

Question 7

Rearrange to find the end speed (final velocity) using the initial velocity, acceleration and time

Answer 7

v = at + u

Question 8

On a velocity time graph how do i work out distance

Answer 8

Area of the shapes (say it is a triangle and rectangle shown together) and then add them up

Question 9

Work out final velocity again but without time and with displacement (s)

Answer 9

v2 = u2 + 2as

Question 10

Rearrange the equation v2 = u2 + 2as where s is the subject

Answer 10

s = v2-u2
——–
2a