P3b: Changing speed

Question 1

Describe speed time graphs(4)

Answer 1

Horizontal line - constant speed

Straight line positive gradient = increasing speed (accelerating)

straight line negative gradient - decreasing speed (decelerating)

curve - non-uniform acceleration or deceleration

Question 2

Acceleration can involve a change in: (3)

Answer 2

speed, direction, or both

Question 3

Acceleration equation

Answer 3

acceleration (m/s 2) = change in speed / time taken

Question 4

What is the relative velocity of two cars that are moving past each other(2)

Answer 4

the sum of their individual velocities if they are going in opposite directions

the difference of their individual velocities if they are going in the same direction