1. Describing Motion

3. Speed The distance an object travels in a certain amount of time.
Average speed – Total distance divided by total time
Constant speed - Speed that does not change over time
On your paper, describe an example of an object at a constant speed.

4. What is the formula for calculating speed?
Speed equals distance divided by time. S = d t

5. Let’s Practice Calculating Speed
In your notebook, calculate this problem. Make sure you show all work!
One side of a track is about 100 meters long. If it takes a person 20 seconds to run its length, how fast was the person running?

6. Remember to label the UNITS!!
Check Your Work
One side of a track is about 100 meters long. If it takes a person 20 seconds to run its length, how fast was the person running?
Speed = Distance ÷ Time
Speed = 100 m ÷ 20 s
Speed = 5m/s
Remember to label the UNITS!!

7. Velocity An object’s speed and direction at a given time
The wind is blowing 65 km/hr from the North.
On your paper, describe an example of velocity.

8. Acceleration
A change in the direction or velocity of an object over time – which may be:
A change in speed
Starting
Stopping
Speeding up (positive acceleration)
Slowing down (negative acceleration)
A change in direction
Acceleration is caused by unbalanced forces.
On your paper, describe an example of an object accelerating.

13. Our first super hero is Fire Hawk, he represents Speed.
Our second hero is Rocket Man, he represents Velocity.
For our final super hero we changed it up and made him a super villain, his name is Steam Roller. He represents Acceleration.