Describing Motion.

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Presentation transcript:

Describing Motion

How to Describe Motion Words - the car is traveling 30 m/s due east Equations and values - d/t = speed 100m/20s = 5m/s Graphically -

With pictures

Vectors and Scalars A vector is a number with units and includes direction. Velocity is a vector - 130mph West A scalar quantity is a number with units but does not specify the direction Speed is a scalar quantity - 130mph

Vocabulary Reference point - a zero point Position - separation of object and reference point Distance - separation of two objects or locations, needs no reference point. Displacement - distance and direction between two positions

Calculating Motion Ave. Speed = total distance s=d/t total time Ave. Velocity = total displacement v = d/t Or velocity 1 + velocity 2 2 only if traveling at each velocity for the same amount of time This does not give you instantaneous speed or velocity.

Units for speed are m/s or cm/s or km/h When calculating average speed or average velocity, can the instantaneous speeds change along the way? Units for speed are m/s or cm/s or km/h If velocity is known, you can calculate distance. Δd = vt or df = di + vt

3 Step Method Write out the equation s = d/t Substitute in your values with units s = 30m/10s 3) Write out answer with units. s = 3m/s

A car travels 450m in 9.0 seconds find the average speed of the car. A train is traveling 45km/hr east for 2.5 hrs. Find the displacement of the train. A person on a bike is traveling 20m/s for 10s and then speeds up to 50m/s for 10s. Find the ave. speed of the bike. A person on a bike is traveling 20m/s for 100m and then speeds up to 50m/s for 100m. Find the ave. speed of the bike.