1. Section 1 Distance and Displacement
Chapter 11 Motion
Section 1 Distance and Displacement

2. Practice Questions 1. How many m are in 28 Km?
2. Rearrange the following equation to solve for d ; v = d/t
3. What are the SI units for distance and time?

3. Frame of Reference How fast are you moving right now?
Earth is moving at 1000 mph
If you are sitting in a desk you are not moving at all compared to the person next to you.
In a car you may be moving at 55 km/hr compared to the world around you, but compared to the person sitting across from you, you’re not moving.

4. Frame of Reference
Frame of Reference- is a system of objects that are not moving with respect to each other.

5. Video!!! Which way does an apple fall???

6. Relative Motion
How fast you are moving also depends on your relative motion.
Relative motion- is movement in relation to a frame of reference.
Compared to the people in the seat of the car next to you, you are not moving.
Compared to the people on the side of the road you are traveling at 55 km/hr

7. Distance Distance- length of a path between two points.
Remember to use appropriate units when measuring distance.

8. Displacement
Displacement is the length of a straight line from the starting point to the ending point and the direction from starting point to ending point.
Example- distance- I walked 5 blocks
Example- displacement- I walked 5 blocks north

9. Displacement as a Vector on a straight line
Vector- is a quantity that has magnitude (a number) and direction.
You can find displacement using vector addition.
Ex. 5 blocks East then 4 more blocks East.
Ex. 5 blocks East then 2 blocks back West.
5 blocks
4 blocks +
5 blocks
2 blocks +

10. Displacement not along a straight line
If you graph the total distance and draw a straight line from the starting point to the finishing point you can find the total displacement