P9

Question 1

Describe the difference between speed and velocity

Answer 1

Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object’s movement.

Question 2

What quantity is speed

Answer 2

Scalar

Question 3

What quantity is velocity

Answer 3

Vector

Question 4

How to find acceleration

Answer 4

Acceleration=change in velocity
————————–
Time taken

Question 5

Features if velocity time graph

Answer 5

Velocity-time graphs

Acceleration is shown by a straight rising line.

Deceleration is shown by a straight falling line.

Constant speed is shown by a horizontal line.

A horizontal line along the -axis shows the speed is zero, meaning that the vehicle has stopped, or is stationary.

Question 6

Key features of displacment time graph

Answer 6

The gradient of the graph equals the velocity of the object
A positive gradient means the object is travelling forwards
A negative gradient means that the object is travelling backwards
The steeper the line, the greater the speed

Question 7

Key features of distance time graph

Answer 7

A sloping line on a distance-time graph shows that the object is moving.

In a distance-time graph, the slope or gradient of the line is equal to the speed of the object.

The steeper the line (and the greater the gradient) the faster the object is moving.

Question 8

How to identify speed on a distance time graph using the change in gradient

Answer 8

In a distance-time graph, the gradient of the line is equal to the speed of the object. The greater the gradient (and the steeper the line) the faster the object is moving.

Question 9

I can identify acceleration on a velocity-time graph using change in gradient.

Answer 9

To determine the numerical value for acceleration using the gradient of the graph, you divide the axis value by the axis value.