**Speed Time Graphs**

Drawing Speed-time graphs

The graph below shows the distance travelled by an object over 30 seconds.

Draw a speed time graph for the object over the 30 seconds.

Activity

Complete the Speed and Velocity time graphs worksheet.

Example

L.O. - Draw and interpret speed-time graphs.

The graph below shows the speed of an object over time.

(a) When is the object stationary?

(b) When is the object travelling at a constant speed?

(c) When is the object accelerating?

Example

The graph below shows the speed of an object over time.

(a) When is the object stationary?

Between C and D

(b) When is the object travelling at a constant speed?

A to B and E to F

(c) When is the object accelerating?

O to A and D to E (also B to C)

Example

The graph below shows the speed of an object over time.

What is the acceleration over the first five seconds? Give the units of your answer.

Example

The graph below shows the speed of an object over time.

What is the acceleration over the first five seconds? Give the units of your answer.

2 metres per second per second or 2 metres per second squared.

Drawing Speed-time graphs

The graph below shows the distance travelled by an object over 30 seconds.

Draw a speed time graph for the object over the 30 seconds.

Example

Velocity (m/s)

(a) At which times are the object not accelerating or decelerating.

(b) At which time is the object's speed 0.

(c) Estimate the acceleration of the object after 3 seconds.

Example

Velocity (m/s)

(a) At which times are the object not accelerating or decelerating.

After 2 and 6 seconds.

(b) At which time is the object's speed 0.

At 4 seconds

(c) Estimate the acceleration of the object after 3 seconds.

Approx -1 m/s

2

Activity

Complete the Speed and Velocity time graphs worksheet.

1) (a) The graph is a straight line. (b) 8 metres per second squared.

2) (a) After 10 seconds and also 25 seconds. (b) Approx -1.6 ms

3) (b) 3.75 m/s (c) 12.5/1.5 = 8.3333 m/s

4) (a) 4 ms (b) After about 4 seconds.

5) (a) After 40 seconds, 69 seconds, and 92 seconds (b) 0.6 ms

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