1. Welcome to Physical Science

2. Distance traveled divided by the time elapsed
Speed
Distance traveled divided by the time elapsed

3. speed at any specific instance speedometer Average Speed
Instantaneous Speed
speed at any specific instance
speedometer
Average Speed
Total distance covered divided by elapsed time
Ave Speed = Total Distance / Total Time

4. Speed Problem
If a car travels at an average of 47.3 miles per hour, how long will it take to get from Ephraim to Las Vegas which is 300 miles away?

5. Velocity
Speed plus Direction

6. An arrow representing velocity
Vector
An arrow representing velocity
Length = speed of object
Direction = direction of motion

7. Velocity Vectors

8. How fast is the plane moving in respect to the ground?

9. How fast is the plane moving in respect to the ground?

10. How fast is the plane moving in respect to the ground?

11. How fast is the plane moving in respect to the ground?

12. How fast is the plane moving in respect to the ground?

13. How fast is the plane moving in respect to the ground?

14. Change in velocity divided by the change in time
Acceleration
Change in velocity divided by the change in time
Δ V
A = ——
Δ T
Δ = Change

15. Acceleration due to gravity formula
Free Fall
Acceleration due to gravity formula
D = ½ gt2
D = Distance g = gravity (9.8 m/s2) t = time (seconds)
Gravity = 9.8 m/s2 or ft/s2

16. If a rock is dropped from a building, and it takes 18 seconds to reach the ground, how tall is the building.

17. Assignment Due for Discussion of Monday
Find a high place (bridge, building, cliff) and drop an object off of it. Determine how high you are. Then estimate to see if you answer seems reasonable.