3.3 Describing movement [Must Do]

Which of these can be worked out from a distance/time graph? (a)  

• The force on an object.
• The speed of an object.
• The mass of an object.
• The weight of an object.

Tags

NGSS.MS-PS3-1

Look at the distance/time graph for a train.

Which of these distance/time graph shows the train going faster?

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Answer explanation

When the train going faster, it is moving a larger distance within shorter time and hence the graph should be steeper.

Tags

NGSS.MS-PS3-1

Look at the distance/time graph for a train.

Which of these distance/time graph shows the train going slower?

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Answer explanation

When the train going slower, it is moving a smaller distance each second and hence the graph should be less steep.

Tags

NGSS.MS-PS3-1

Which of these distance/time graph for an object moving at a constant speed away from a starting point?

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Answer explanation

The train travels the same distance in each second, and so it is moving at constant speed.

Which of these distance/time graph for an object moving at a constant speed back towards the starting point?

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Answer explanation

The distance of the train decreases with time shows it is moving back to the starting point.

Which of these distance/time graph for an object which is stationary or not moving?

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Answer explanation

A horizontal straight line graph shows the distance from a starting point does not change even though the time still passes.

Look at the distance/time graph for a runner.

What is the speed of the runner?

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Tags

NGSS.MS-PS3-1

Both graphs have the same axes for a faster and a slower runner.

Both runner run at constant speed.

Match the following graph with the right runner.

• fastest

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• slower

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• faster

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Answer explanation

The steeper the graph, the higher the speed.

The distance/time graph shows part of a cyclist's journey. The speed of the cyclist increases in ascending order as ​ (a)   > ​ (b)   > ​ (c)   .

• C
• A
• B

Tags

NGSS.MS-PS3-1

Look at the distance/time graph of an animal whose speed is changing all the time.

Calculate the average speed of the animal.

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Tags

NGSS.MS-PS3-1