1. Unit 2: Physics!
Kinematics

2. Speed is the rate at which an object moves.
Like distance and displacement, speed and velocity is another scalar-vector pair.
Speed is the rate at which an object moves.
Scalar quantity
Velocity is a vector quantity, so it has both magnitude and direction.
Acceleration is the rate of change of velocity.
Vector quantity

3. Speed Average Speed Vave is:
The total distance divided by the total time for a trip
Instantaneous speed – the speed an object is travelling at a particular instant. Ie. Radar trap
Constant Speed (uniform motion) – if the instantaneous speed remains the same for a period of time. Ie. Cruise control on your car

4. Velocity

8. A car travels 45 km at a speed of 90 km/h. How long did the trip take?
What do you know in the Question
d= 45 km
Vav = 90 km/h
t = ?

9. t = 0.5 h t = 45 km 90 km/h Write a concluding statement if asked:
Substitute the knowns into the formula and solve
t = 45 km
90 km/h
t = 0.5 h
Write a concluding statement if asked:
It takes 0.5 h for the car to travel 45 km at a speed of 90 km/h

10. Problem Solving Summary
List the variables you know
Decide on a formula, rearrange if you need
Substitute what you know into the formula
Solve and write a concluding statement