This document discusses key concepts of motion including frame of reference, distance, displacement, speed, and velocity. It defines frame of reference as describing motion relative to fixed points. Distance measures how far an object moves while displacement also considers direction of motion. Speed is defined as distance over time and does not include direction, while velocity includes both speed and direction of motion. The document provides examples of calculating speed and solving motion problems using equations.

1. MotionChapter 11

2. Measuring Motion Motion of an object must be observed within a frame of reference. Frame of reference – describes the motion of an object relative to fixed points.What is the fixed point in the photograph?

3. Distance and displacementDistance measures how far or the length of the motion.Displacement not only measures how far but in what direction.50 miles 50 miles west Displacement must describe where the object is moving. (North, south, east, west, up, down, toward Springfield etc.)

4. Speed and Velocity Speed describes how fast an object moves.Speed = distance What does this mean? time The units for speed are (m/s, km/h, mi/h etc)Velocity describes how fast and in what direction. Don’t forget to include the direction. This dog has a velocity of 10 mi/h to the east! Golly, he’s fast. Or is he?

5. Let’s work some problems, shall we.Write the equation for speed.S = D TCould we rewrite this so we don’t have a fraction? YES HOW?Get rid of the T by multiplying both sides by T and there you have it! S x T = D x T TST = D

6. Okay, now for some practice A twizzler is 16 cm in length and you can eat the entire twizzler in 45 seconds. What is your twizzler eating speed? Equation D = ST or S = D/THere we go… Plug in your numbers to the appropriate spot.D = 16 cm X = 16 cmT = 45 sec 45 secS = X X =

7. Motion videovideo

8. Distance vs. time graphYou can determine the speed, distance and time of an object by reading a distance vs time graph.