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# sport velocityVelocity-time graphs

2022-6-21 02:51| 发布者: m7SxQNScFYv9sP| 查看: 6| 评论: 0 When an object is moving with a constant velocity, the line on the graph is horizontal. When the horizontal line is at zero velocity, the object is at rest. When an object is undergoing constantacceleration>

Thevelocityof an object isits speed in a particular direction. Two cars travelling at the same speed but in opposite directions have different velocities.

The steeper the line, the greater the acceleration of the object. The purple line is steeper than the green line because it represents an object with a greater acceleration.

Average speed is distance divided by time. Velocity is speed in a given direction. Acceleration is change in velocity divided by time. Movement can be shown in distance-time and velocity-time graphs.

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Acceleration can be calculated by dividing the change in velocity (measured in metres per second) by the time taken for the change (in seconds). The units of acceleration are m/s/s or m/s2.

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= change in velocity (m/s) time taken (s)

The vertical axis of a velocity-time graph is the velocity of the object. The horizontal axis is the time from the start.

We can calculate the acceleration shown in the first section of the green line as follows:

The acceleration shown in the purple line can be calculated as follows:

This is the gradient of the purple line.

Notice that a line sloping downwards - with a negative gradient - represents an object with a constant deceleration (it is slowing down).

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. The diagram shows some typical lines on a velocity-time graph.

= change in velocity (m/s) time taken (s)

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, the line on the graph is straight but sloped.

Curved lines on velocity-time graphs also show changes in velocity, but not with a constant acceleration ordeceleration>

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A velocity-time graph shows the speed and direction an object travels over a specific period of time. Velocity-time graphs are also called speed-time graphs.

This is the gradient of the first section of the green line.

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