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Published byJonathan Dwayne Simmons Modified over 4 years ago

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2-1 Describing Motion What factors are important when describing motion? Time Distance

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**Speed Distance object travels in a certain amount of time**

a description of motion tells how fast an object moves

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Calculating Speed What two sets of data need to be collected in order to calculate speed? Distance Time

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Speed Equation Combining all of the information along with the definition of average speed the equation is

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Where v is average speed, units of m/s d is distance, units of meters t is time, units of seconds

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**a speed that stays the same and doesn’t vary Instantaneous speed**

Constant speed a speed that stays the same and doesn’t vary Instantaneous speed rate of motion at an exact time look at a speedometer to find

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**average speed Most speeds aren’t constant, they vary**

bike riding in the wind passing a car going down hill running slower because you are tired Use average speed-total distance divided by total time. Unable to determine instantaneous speeds or if speed was constant

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**Velocity Velocity vs speed**

If you are to out run a storm, what information would you want to know? Velocity is a speed in a certain direction

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**Can you keep constant velocity, but change your speed?**

Can you keep constant speed, but change your velocity?

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