Physics Unit 2 Study Guide

Motion

1 The table gives values of distance and time for a child travelling along a straight track competing in an egg and spoon race.
Time (seconds) |0 |5 |10 |15 |20 |25 | |Distance (metres) |0 |8 |20 |20 |24 |40 | | a Copy the graph axes below on to graph paper. Plot a graph of distance against time for the child. [pic] (3) b Name the dependent variable shown on the graph.

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c What type of variable is this?

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d Use your graph to estimate the distance travelled in 22 seconds.

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e Use your graph to estimate the time taken for the child to travel 15 metres.

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f Describe the motion of the child between 10 seconds and 15 seconds. Give a reason for your answer.
[pic] a What was the distance of the race?

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b How long did it take the runner to complete the race?

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c For how long did the runner rest during the race?

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d Between which two points was the runner moving the fastest? Give a reason for your answer.

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e Between which two points did the runner travel at the same speed as they did between A and B?

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f Calculate the speed of the runner between B and C in metres per second. Show clearly how you work out your answer.

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3 A cyclist is travelling along a straight road. The graph shows how the velocity changes with time for part of the journey. [pic] a Explain how is acceleration found from a velocity–time graph.

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b Copy and complete the following sentences using the list of words and phrases below. Each one can be used once, more than once or not at all. is stationary travels at a constant speed accelerates decelerates

i Between A and B the cyclist ……………………