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Published byJonah Fisher Modified over 6 years ago

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Do Now: Distinguish between distance and displacement. Which directions are positive? Which directions are negative?

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Kinematics = study of motion How many dimensions do we live in? 4.

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1.What is motion? Define it! 2. Are you in motion right now? Explain.

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How do you know something is moving? Need frame of reference – backdrop.

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Objects In Motion change position in space, along x, y, z relative to reference frame. Symbol for change . Means subtract: x = x f - x i.

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Simplest form of motion is 1 dimensional or 1-d. Straight line motion.

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Speed & Velocity

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Speed & Velocity Scalar & Vector Speed rate an object covers distance – scalar (v) Velocity – rate of an object’s displacement - includes direction. (v)

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Speed = total distance/time SCALAR. No direction indicated. speed = d tot /t tot. Velocity = displacement/time VECTOR. Includes direction. v = x/t, v= s/tv = d tot /t tot. Vel direction/sign = displacement. Average Speed & Velocity

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Text In class Problems pg 44 #1, 4, 6.

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1. A car travels 200 km north in 1.8 hours, turns and drives 30 km south in 0.6 hours. Calculate the average: a. Speed b. Velocity

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2. A bus travels 55 km west in 0.25 hours, stops for 30 minutes, turns and travels 145 km east. The eastward trip takes 2 hours. Calculate the average: a. Speed b. Velocity

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Equations are for average not instantaneous velocity. Only if object travels at constant velocity, average = instantaneous.

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Read text pg 40 - 42 Do Wksht Introduction to Motion

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Take out Homework Jot down the answer in you notes. What is the acceleration of a turtle moving east at 0.25 m/s. A car driving west at 20 m/s slows to a stop. What is the sign of the acceleration? If a car is moving to the east, can its acceleration be west? Explain and give an example.

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Graphs of Motion Position/Distance/Displacement – time Constant v. What is the difference btw the 2 Starting point

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Uniform/ constant velocity v = slope. Calculate the velocity.

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Slope = 0

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Constant vs. Changing speed

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Displacement has direction includes neg quadrant.

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Describe what is going on

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Many objects in motion

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Uniform/Constant Acceleration Instantaneous velocity = slope of tangent.

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Hwk Text Rd p 45 – 46. Do pg 69 #1 - 5, #10, #14.

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