Date post: | 18-Jan-2016 |
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Speed, Velocity, & Acceleration
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You know a car is in motion if you see it in one place
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then in another place in relation to an object
3 ways to change motion
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1. Speed2. Velocity3. Acceleration
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Vocabulary:
speed
The distance something moves in a certain time
Speed = Distance Time
Many people can walk 2 miles in 1 hour
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Speed =2 miles1 hour
Their speed is 2 miles per hour
It is often written 2 miles / hour
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Some people can run 7 miles an hour
or7 miles / hour
The speed of 7 miles / hour is faster than 2 miles / hour
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Vocabulary:
velocity
Speed in a certain direction
If you are running at 7 miles / hour along a straight path
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your velocity is the same as your speed
But if you are running around a track you are changing
direction
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Your speed is the same, but your velocity is changing
Velocity changes when the direction of the motion
changes
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Vocabulary:
acceleration
a change in velocity
If you pedal a bicycle so that it speeds up
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that is positive acceleration
If you use the brakes to slow down
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that is negative acceleration