Speed & Velocity Scalar & Vector Speed rate an object covers distance – scalar (v) Velocity – rate of an object’s displacement - includes direction. (v)
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
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
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
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. What is the difference btw the 2 Starting point
Uniform/ constant velocity v = slope. Calculate the velocity.