Motion and Speed. Motion- a change in position. A reference point is needed to know if the position has changed. Speed- the rate of change in position…rate.

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Presentation transcript:

Motion and Speed

Motion- a change in position. A reference point is needed to know if the position has changed. Speed- the rate of change in position…rate of motion.

There are several ways to measure speed. 1.Instantaneous speed- rate of motion at any given instant. Ex: speedometer 2. Constant speed- speed that does not change.

3. Average speed- total distance traveled divided by the total time of travel. This is the best way to describe speed when the rate of motion changes.

Speed Equation VariableEnding Units d = distance meter or kilometer t = timesec. or hr. or min. s = speedmeter/sec. or (or v) kilometer/hr.

d = s (v) X t t = d / s (v) s (v) = d / t d s (v)t X

Ex: A passenger elevator operates at an average speed of 8 m/s. If the 60 th floor is 219m above the first floor, how long does it take the elevator to go from the first floor to the 60 th floor?

Ex: A motorcyclist travels an average speed of 20 km/h. If the cyclist is going to a friend’s house 5 km away, how long does it take the cyclist to make the trip?

Ex: Sound travels at a speed of 330 m/s. If a lightning bolt strikes the ground 1km away from you, how long will it take for the sound to reach you? (Watch out for this one!!!)