Do Now: Distinguish between distance and displacement.

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Presentation transcript:

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

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

1. A boy rides his bike to the store at an average speed of 18 km/h 1. A boy rides his bike to the store at an average speed of 18 km/h. If the trip takes 30 minutes, what distance has he ridden. Rearrange - isolate unknown. d = vt Plug in w units d = (18 km/h)(0.5 h) Show cancellations Solve w units. d = 9 km List v = 18 km/h t = 30 min t = 0.5 h d = ? Equation: v = d/t

2. A car travels 200 km north in 1 2. A car travels 200 km north in 1.8 hours, turns and drives 350 km south in 2.6 hours. Calculate the average: a. Speed (km/h) b. Velocity (km/h) speed = 125 km/h Velocity = - 34 km/h 34 km/h south

3. 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 Speed = 72.7 km/h Velocity = -1.3 km/h or km/h west

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

Read text pg 40 - 42 Do Wksht “Introduction to Motion”

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.

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

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

Slope = 0

Constant vs. Changing speed

Displacement has direction includes neg quadrant.

Describe what is going on

Many objects in motion

Uniform/Constant Acceleration Instantaneous velocity = slope of tangent.

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