1. Welcome! Warm up: No warm up today Get ready to take Cornell notes Title your notes “Intro to 1-D Motion” Warm ups due this Friday Quiz later this week 1

2. 2 MOTION

3. Position vs. Time position Time m s What is the slope measuring? Velocity What unit do we use for position? What unit do we use for time? Combine these units and you get the unit for velocity. Or….m/s

4. 4 Kinematics KINEMATICS – the study of motion UNIFORM MOTION - Uniform=constant Uniform motion means that for every unit of time you are travelling an equal amount of distance

5. Distance vs. Displacement Distance – how far something has traveled Displacement – the DIFFERENCE between where something started and where something ended: the total change in position Ex: What distance have you travelled if you run around a 400m long track 2 times? 800 meters Ex: What is your displacement if you run around a 400 m long track 2 times? HINT: how far are you away from where you started? Ans: 0 m 5

6. More Displacement Displacement always includes a SPEED and a DIRECTION + means “up” or “right” or “forward” “North” or “East” - means “down” or “left” or “back” or “South” or “West” Think of it like you would a graph in Math 6

7. 7

8. 8 Speed – Definitions Speed –how fast something is moving (always a positive number) Units: Distance = m Time = s V = m/s

9. Difference between speed and velocity Velocity - is speed with a direction. “Direction” is expressed as + or – Velocity is always expressed with a speed and direction Ex: 20 m/s North We use the same units AND equation for both speed and velocity

10. Acceleration Acceleration – change in speed or direction Can be speeding up OR slowing down If velocity is towards the left and an object is slowing down, it is said to have a rightward acceleration If velocity is towards the right and the car is slowing down, it has a leftward acceleration 10

11. 11 “Ticker Tape” Diagrams Are a type of motion diagrams The term ticker-tape referred originally to the use of the paper output of ticker tape machines, which were remotely- driven devices used in brokerages to provide updated stock market quotes (Wikipedia). Ticker tape parades

12. 12 “Ticker Tape” Diagrams In Physics, a long tape or paper is attached to a moving object A device places a “tick” on the paper at even intervals (ex: every 0.1s, every 1s, etc.) As the object moves, it pulls the paper with it and the device places the ticks, tracking the motion Trail of dots represents the object’s motion through time

13. 13 “Ticker Tape” Diagrams Distance between the dots represents the objects position change during that time interval Small distance between dots – object moving slow Large distance between dots – object moving fast

14. 14 “Ticker Tape” Diagrams Analysis also shows if the object is moving with a constant velocity or accelerating