Physical Science 2 nd Semester Physics Draw motion.

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Presentation transcript:

Physical Science 2 nd Semester Physics Draw motion

1. Draw a map from school to your house. 2. Place a dot at your house. 3. Place a second dot at the school. 4. Write a paragraph describing the directions.

 Distance – the length of a path between two points (How many steps taken)  Ex: 40m + 30m = 70m  Displacement – shortest path between two points with direction  (How far away from start and direction)  Ex: 50m east then 40m west is calculated as 50m east - 40m west = 10m east

 Below your notes draw the following: 1. Draw a dot at the top of the space on your paper. 2. Connect the two dots using 5 straight lines in a zigzag pattern. 3. Use a ruler to determine the distance of your path. 4. Use a ruler to determine the displacement from start to finish in cm. Distance (how far your pencil moved) = ______ cm Displacement (line from first to last dot) = ______ cm

 Motion – change in position with frame of reference  Speed – distance moved in a given time  (How fast are you going?) ratio or rate  s=d/t s=speed d=distance t=time  SI unit: m/s m=meter s=second

Velocity – speed plus direction  Ex: m/s north  (How fast are you going in a direction?  Ques: If you are going the same speed around a race track does your velocity change?

 Instantaneous – rate at a specific instant Ex: radar gun measures how fast right now  Constant Speed – your speed remains the same Ex: using cruise control in your car  Average Speed – total distance travelled in total time (How fast was the whole trip?)  Ex: Average speed to Greenville is 42 mi/hr