Physics 11

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Instantaneous Speed Question Instantaneous speed is the speed at which an object is traveling at a particular instant. It is not affected by its previous speed, or by how long is has been moving. High instantaneous speeds contribute to the seriousness of road traffic accidents. The two most familiar instruments that measure instantaneous speed were designed to improve road safety: the speedometer and the radar gun. For any object moving at a constant speed, the instantaneous speed is the same at any time, and equals the constant speed. Example: Calculate the instantaneous speed of the graph below: Movement of an object over time

displacement North [m]

25

20

15

10

5

0 0

10

20

30

time [s]

40

50

60

For objects that have changes in speed, the instantaneous speed is calculated by finding the slope of a tangent that touches a curve at only one point. Example: Calculate the instantaneous speed of the graph below: Movement of an object over time 120

displacement North [m]

100

80

60

40

20

0 0

5

10

15

20

time [s]

25

30

35

40

Instantaneous Speed Question.pdf

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