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

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

Speed Distance object travels in a certain amount of time
a description of motion tells how fast an object moves

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

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

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

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

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

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

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

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