Download - Motion and Speed
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Motion and Speed
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Objects move relative to other objects Video *Motion – Changing position relative to a
fixed point
What is motion?
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*Speed – how fast an object is moving
Speed
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Ex 1 A cheetah covers 50 meters in 2 seconds.
What is the cheetah’s speed? Speed = D/T Speed = 50 m / 2 s Speed = 25 m/s
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Ex 2 A red corvette is speeding down the
highway at 150 km/hr. If it continues at this speed for 1.5 hours, how far has it gone?
Speed = d/t 150 km/hr = d/1.5 hrs 1.5 hrs*150 km/hr = d 225 km = d
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*Instantaneous Speed – speed at a specific moment in time
*Average Speed – average speed over a given period of time
Speed
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A hedgehog wakes up at 10:23. As soon as he wakes up, he starts sauntering towards some bugs to eat. After three seconds, he is moving at 0.5 m/s. After 10 seconds, he has moved 2 meters from where he started.
A. What is the hedgehog’s instantaneous speed after three seconds?
B. What is the hedgehog’s average speed over the 10 second interval?
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Book page 62 #1-4, 26-31
Homework
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In groups of 2-3, go to a computer and use the motion detectors to complete the “lab activity” posted on the website.
Motion Detectors