**Physics II Day 10**

**Velocity and Acceleration**

**Velocity**is the speed of an object in a certain

__direction__.

*How is it any difference from speed? Example: You and your friend walk 10 miles per hour for an hour in opposite directions. You walked the same distance and the same speed, but you are not in the same place*

**In everyday life, we use accelerate to mean something is**

__speeding up.__

**Scientifically, acceleration**is a change in

__speed__,

__direction__, or

__both__OR the rate at which

__motion__changes.

To decide if an object is accelerating or
not:

1)
Visualize it!

**2)**Ask yourself: Is it

__moving__? If it is not, it is

__not accelerating.__
3)
Ask yourself: Has it started
covering a greater (or shorter)

__distance__in the same amount of time? If it is,**it is accelerating.**
4)
Ask yourself: Is it

__turning__?If it is, it**is accelerating.**

__Let’s Try as a Class__*Example 1: Slamming on your brakes and going from 70 mph to 0 mph in 13 seconds.*

It is ________________________________ because
____________________________

________________________________________________________________________________________________.

*With a Partner 1: Going 70 kilometers per hour straight down a highway for 3 hours.*

It is ________________________________ because
____________________________

________________________________________________________________________________________________.

*With a Partner 2: A ballerina skating in a circle.*

It is ________________________________ because
____________________________

________________________________________________________________________________________________.

*Partner Challenge – TPWS - (Think for two minutes, discuss for two minutes)***In the graph to the left, is the object accelerating? HOW DO YOU KNOW?**

**____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________**

__On Your__

__Own__

__: I__

__s it Accelerating?__
It is ________________________________
because ____________________________

________________________________________________________________________________________________.

2) Shamyia runs the 500-meter dash. She
starts off only running 2 meters per second, but halfway through the race she
is running 9 meters per second.

She is ________________________________
because ___________________________

________________________________________________________________________________________________.

3) A swimmer swims across a pool at a rate of
5 meters per second.

He is ________________________________
because ____________________________

________________________________________________________________________________________________.

4) In a traffic jam, Ms. Hamam drives 30 mph
for 10 minutes, 15 mph for 20 minutes, then 40 mph for 5 minutes.

Her car is ________________________________
because _____________________

________________________________________________________________________________________________.

5) This graph above shows a bullet train’s motion.
Is it accelerating?

It is ________________________________
because
________________________________________________________________________________.

6. The graph below shows the motion of a
skateboarder. Is the skateboarder accelerating between 1 and 5 seconds?

It is ________________________________
because ______________________________________________________________________________.

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