Starter quiz
- Five yachts have a sailing race around the same course. Their completion times are shown. Starting with the fastest, put them in order of average speed.
- 1⇔1 hour 15 minutes
- 2⇔1 hour 19 minutes
- 3⇔1 hour 20 minutes
- 4⇔1 hour 28 minutes
- 5⇔1 hours 49 minutes
- An electric scooter has a maximum speed of 2.5 m/s. Calculate the maximum distance it can travel in 50 s.
- 2.5 m
- 20 m
- 47.5 m
- 52.5 m
- 125 m ✓
-
- Which word is used to describe an object which has a decreasing velocity?
- 'decelerating' ✓
- Which of these is the correct unit for acceleration?
- m
- m/s
- ms
- m/s ✓
- m/s
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- A satellite travels a distance of 10 800 km in 1 hour. What is the speed of the satellite in km/s?
- 10 800 km/s
- 180 km/s
- 3.0 km/s ✓
- 0.33 km/s
- 3.0 m/s
-
- A train speeds up from 2 m/s to 8 m/s in a time of 50 s. Calculate the acceleration of the train.
- 0.12 m/s ✓
- 0.16 m/s
- 0.04 m/s
- 8.3 m/s
- 6.0 m/s
-
Exit quiz
- Match the key words and phrases to their explanations.
- displacement-time graph⇔this shows the displacement of an object over a period of time ✓
- velocity-time graph⇔this shows the velocity of an object over a period of time ✓
- acceleration⇔the rate of change of velocity ✓
- deceleration⇔used to describe an object which is slowing down ✓
Find the change in velocity between 0 s and 8 s shown in this graph.- 2 m/s
- -2 m/s ✓
- -8 m/s
- 8 m/s
- 6 m/s
-
- When is the magnitude (size) of the acceleration greatest according to the velocity-time graph?
- between 0 s and 2 s
- between 2 s and 4 s
- between 4 s and 5 s
- between 5 s and 7 s ✓
- between 7 s and 8 s
-
The graph shows an electric car with changing velocity. At which of these times is the acceleration greatest?- 1 s ✓
- 2 s
- 3 s
- 4 s
- 8 s
-
The velocity-time graph shows the movement of a robotic arm in a factory. Calculate the velocity of the arm in m/s when the time is 10 s. You do not need to include the units in your answer.- '0.15 m/s' ✓
- A car starts from rest and accelerates at a constant 3.5 m/s. Calculate its velocity after 6.0 s.
- '21 m/s' ✓
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- A velocity-time graph shows how velocity changes with time.
- Acceleration is equal to the gradient of a velocity-time graph.
- A falling line shows decreasing velocity called deceleration, which is a negative acceleration.
Common misconception
Pupils often consider time in the acceleration equation to be moment in time (perhaps read from a graph) rather than a change in time.
Label the value of t in the acceleration as a change of time rather than just time.
Keywords
Displacement-time graph - A displacement-time graph shows the displacement of an object over a period of time.
Velocity-time graph - A velocity-time graph shows the velocity of an object over a period of time.
Acceleration - The acceleration of an object is the rate of change of velocity. This is how much the velocity changes per second.
Deceleration - Deceleration is used to describe a change in velocity where the object slows down.
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