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A ball rolling in a straight line
Age 11 · Physics
The path of a moving object is called its trajectory, and here the ball’s positions form a straight line. The gaps are equal, so the ball goes the same distance in each moment, and its speed is the distance divided by the time.
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Age 11: open this week
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In the picture
- The row of ball positions: the trajectory, a straight line
- The measuring tape: the distance the ball travels
- The stopwatch: the time the trip takes
Examples
- A car on a straight motorway that covers 100 km every hour is moving at 100 km/h.
- If you walk 10 metres in 5 seconds, your speed is 10 ÷ 5 = 2 metres per second.
Key takeaways
- A trajectory is all the positions an object passes through, one after another.
- Speed = distance ÷ time; equal gaps in equal times mean the speed stays the same.
Quiz: A ball rolling in a straight line (Age 11)
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What is the trajectory of a moving object?
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How do you work out an object’s speed?
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A ball travels the same distance in each equal amount of time. What can you say about its speed?
The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.
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