1.  The Big Thrill Section 4.1

2. Roller Coaster Fun  When did Kris’ expression change?

3. Measuring Velocities and Calculating Acceleration  How do you calculate speed?  What do you need for it to be a velocity?  How do you calculate acceleration?

4. Vocabulary  Scalar – a quantity that has magnitude, but no direction  Vector – a quantity that has both magnitude and direction

5. Scalar Quantities  Time  Temperature  Volume  Mass  Speed

6. Vector Quantities  Velocity  Acceleration  Force  Weight

7. Vocabulary  Speed – the change in distance per unit time; speed is a scalar; it has no direction  Velocity – speed in a given direction; displacement divided by the time interval; velocity is a vector quantity; it has magnitude and direction  Acceleration – The change in velocity per unit time

8. v av ΔdΔd ΔtΔt WHAT IS SPEED?

9. a ΔvΔv ΔtΔt WHAT IS ACCELERATION?

10. Practice Problems  A roller coaster changes from a speed of 4 m/s to 16 m/s in 3 s. Calculate the magnitude of the acceleration of the ride?

11. Practice Problems  A cart is 10 cm long. It travels through a photogate in 2 s. Calculate the cart’s speed.