1. Distance, speed and acceleration
Physics 2
Chapter 15
GCSE Additional Science

2. Distance, speed and acceleration
V × t
Speed = distance (metres)
time (seconds)
Click here for the answers
Aled walks 200m in 40s. What is his speed?
Lowri travels 2km in 1000s. What is her speed?
How long would it take for Dafydd to run 100m if he runs at a speed of 10m/s?
Heledd travels at a speed of 50m/s for 20s. How far does she travel?
A car travels at a speed of 85 mph (about 40m/s). How long would it take for him to travel 20km?
1) 5m/s
2) 2m/s
3) 10s
4) 1000m/s
5) 500s
Chapter 15
GCSE Additional Science

3. Distance-Time Graphs 40 30 20 10 GCSE Additional Science Chapter 15
4) Straight line at a downwards angle =
2) Straight horizontal line = 40 30 20 10
Motionless
Constant speed in reverse
3) Straight line at a greater angle upwards =
Distance (metres)
Chapter 15
GCSE Additional Science
Straight line at an upwards angle =
Time/s
Constant speed forwards (high)
Constant speed forwards (low)

4. GCSE Additional Science40 30 20 10
Distance (m)
Time (s)
Chapter 15
GCSE Additional Science
What is the speed during the first 20s?
How far is the object from the start after 60 seconds?
What is the speed during the last 40s?
When was the object travelling at its fastest?
Click here for the answers
1) 0.5m/s
2) 40m
3) 2m/s in reverse
4) 40 – 60s

5. Speed v Velocity GCSE Additional Science Chapter 15
Simply, speed is the distance travelled per second …
This car’s speed is 20m/s
Velocity is the distance travelled per second in a specific direction …..
Chapter 15
GCSE Additional Science
Speed of 20m/s to the right

6. Acceleration change in velocity (m/s) acceleration (m/s2) = time (s)
V - U
a × t
A biker speeds up from 0 to 10m/s in 5 s. What is the acceleration?
A ball is dropped with an acceleration of 10m/s2 for 12s. By how much will the velocity of the ball change?
A car speeds up from 10 to 20m/s with an acceleration of 2m/s2. How much time did this change take?
A rocket speeds up from 1 000m/s to 5 000m/s in 2s. What is its velocity?
Click here for the answers
Chapter 15
1) 2m/s2
2) 120m/s
3) 5s
4) 2000m/s2
GCSE Additional Science

7. Constant deceleration Constant acceleration (lower)
Velocity-Time Graphs
Line at an upwards angle = 80 60 40 20
Constant acceleration
4) Line at a downwards angle =
Constant deceleration
3) Line at an upwards angle =
velocity (m/s)
2) Horizontal line =
Chapter 15
GCSE Additional Science
t(s)
Constant velocity
Constant acceleration (lower)

8. Calculating the Distance80 60 40 20
Velocity (m/s)
t/s
Chapter 15
GCSE Additional Science
To calculate the total distance of the journey, you must calculate the area under the graph.

9. GCSE Additional Science80 60 40 20
Velocity (m/s)
t/s
Chapter 15
What is the velocity after 10s?
What is the acceleration between 20 a 30s?
What is the deceleration between 30 and 50s?
What was the distance of the journey?
Click here for the answers
GCSE Additional Science
1) 40m/s
2) 2m/s2
3) 3m/s2
4) 1700m