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AQA GCSE Physics Distance and displacement

Distance and displacement

This page covers the following topics:

Distance is defined as how far in total an object has travelled. Distance is a scalar quantity, meaning that it is measured only by magnitude and its direction is insignificant. It is usually measured in metres (m). Kilometres (km) can be used for greater distances, and centimetres (cm) and millimetres (mm) can be used for shorter distances.

Distance

Displacement is defined as the total change in position of an object. Displacement is a vector quantity, meaning that it is measured by both magnitude and direction. It is usually measured in metres (m). The same units (m, km, cm, mm) as distance are used to measure displacement.

Displacement

The motion of an object travelling in a straight line can be modelled using a velocity-time graph, where velocity is the y-axis and time is the x-axis. The area under the graph represents the displacement of the object, whereas the gradient of the graph is the acceleration. When the lines of the graph are straight, simple geometry can be used to calculate the area under the graph and thus the displacement of the object, whereas when the lines of the graph are curved, the technique of counting squares can be used instead.

Area under velocity-time graphs

Work is done when a force causes a body to move. It can be calculated using W = force Γ— distance travelled in direction of force, and has units joules (J). The distance covered by an object can be calculated when the work done on the object and the force being applied to it are known.

Work done and distance

1

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What is a good unit of measurement for a large distance?

AQA GCSE Physics Distance and displacement What is a good unit of measurement for a large distance?
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2

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Adam is 300 m away from a supermarket, which is 950 m from his house. Adam decides to walk to the supermarket and then walk back home. Calculate the total distance travelled by Adam.

AQA GCSE Physics Distance and displacement Adam is 300 m away from a supermarket, which is 950 m from his house. Adam decides to walk to the supermarket and then walk back home. Calculate the total distance travelled by Adam.
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3

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Define displacement.

AQA GCSE Physics Distance and displacement Define displacement.
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4

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A runner is running up and down a straight track of 200 m. At a particular point they have traveled a distance of 650 m. Calculate the displacement of the runner if they started running at the start of the track.

AQA GCSE Physics Distance and displacement A runner is running up and down a straight track of 200 m. At a particular point they have traveled a distance of 650 m. Calculate the displacement of the runner if they started running at the start of the track.
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5

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William goes on a walk of distance 2 km. Is William's displacement also equal to 2 km?

AQA GCSE Physics Distance and displacement William goes on a walk of distance 2 km. Is William's displacement also equal to 2 km?
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6

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A velocity-time graph is drawn to model the motion of an object, measuring velocity in m/s and time in s. In a given time interval, the area under the graph is calculated to be 10. Explain what this means.

AQA GCSE Physics Distance and displacement A velocity-time graph is drawn to model the motion of an object, measuring velocity in m/s and time in s. In a given time interval, the area under the graph is calculated to be 10. Explain what this means.
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7

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Using the velocity-time graph, calculate the total displacement of the modelled object between the second and sixth second, given that the maximum velocity of the object is 12 m/s and at t = 6 s, v = 6 m/s.

AQA GCSE Physics Distance and displacement Using the velocity-time graph, calculate the total displacement of the modelled object between the second and sixth second, given that the maximum velocity of the object is 12 m/s and at t = 6 s, v = 6 m/s.
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8

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Use the given velocity-time graph to calculate the total displacement of the object that is modelled by it in the last 7 seconds of its motion from 5 s to 12 s.

AQA GCSE Physics Distance and displacement Use the given velocity-time graph to calculate the total displacement of the object that is modelled by it in the last 7 seconds of its motion from 5 s to 12 s.
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9

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A runner produces a force of 47 N in the forward direction. Given that the work done by the runner is 2350 J, calculate the distance travelled by the runner.

AQA GCSE Physics Distance and displacement A runner produces a force of 47 N in the forward direction. Given that the work done by the runner is 2350 J, calculate the distance travelled by the runner.
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10

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A bodybuilder does 375 J of work to lift a bar of 150 kg at a certain distance above the ground. Calculate the distance.

AQA GCSE Physics Distance and displacement A bodybuilder does 375 J of work to lift a bar of 150 kg at a certain distance above the ground. Calculate the distance.
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