1. Frame of Reference

2. Imagine this… You are sitting in the back seat of a moving car on the highway. You look out the window to observe the scenery outside. You notice a water tower in the distance. As the car you are in gets closer and closer to the water tower, it looks like the water tower is moving towards you. When you tell the other people in the car that the water tower is moving toward you, they say that is impossible because the water tower is motionless. Who is right in this situation? Is the water tower moving?

3. Canon Ball Shot out of Truck

4. Motion (don’t write, just listen) Motion is relative. – This is just a way of saying that sometimes different people will say different things about the motion of the same object. This is not because one of them is wrong, but because they are using different frames of reference. The best way to see how this is possible is to look at some examples.

5. Problem # 1

6. Problem # 2

7. Motion & Frame of Reference (record in notebook) Motion: An object is in motion if its position changes relative to another object. Frame of Reference: place or object used for comparison to determine if something is in motion  An object is in motion if it changes position relative to the frame of reference of another object.  In other words, motion is relative to your point of view (or the object’s point of view)!

8. Example # 1 Sitting at your desk right now, how fast are you moving from the ground’s frame of reference? (point of view) – How fast are you moving from frame of reference of someone in space above Earth? – How fast are you moving from MY frame of reference if I am walking towards you at 1 m/s?

9. Example # 2 Billy and Wanda are both at the bottom of the staircase & escalator. The escalator moves up at 1 m/s. If Billy starts walking up the stairs, while Wanda takes the escalator at the same time, how fast must Billy be walking up the stairs to be considered NOT MOVING from Wanda’s frame of reference? WHY?

10. East West

13. Closure Questions (answer in your physics notebook) 1.The Earth is rotating at approximately 1000 mi/hr to the East. What would happen to YOU if the Earth suddenly stopped spinning? 2.You are on a plane with all the windows closed. Are you moving? How can you tell? If you cannot tell, tell me what you would need to do in order to figure it out! 3.With the NEW knowledge you have gained, what did Mr. Albano tell the cop that pulled him over?

14. Problem # 3

15. Videos Video 1 Video 2 Video 3 Video 4