Day 2: Get your clickers ready! Motion - Position - Velocity Reminders: Register Your Clickers...
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Transcript of Day 2: Get your clickers ready! Motion - Position - Velocity Reminders: Register Your Clickers...
![Page 1: Day 2: Get your clickers ready! Motion - Position - Velocity Reminders: Register Your Clickers Reading for Tues: 1.2, 1.3 (p.24-28) Reading quiz on Tuesday.](https://reader035.fdocuments.us/reader035/viewer/2022070608/5a4d1b887f8b9ab0599bd67e/html5/thumbnails/1.jpg)
Day 2: • Get your clickers ready!• Motion - Position - Velocity
Reminders:Register Your Clickers
Reading for Tues: 1.2, 1.3 (p.24-28) Reading quiz on Tuesday
Homework 1 due Monday at midnight
Using Physics to Understand the World:The Physics of Everyday Life
Physics 1010: Dr. Eleanor Hodby
Find your clicker!
![Page 2: Day 2: Get your clickers ready! Motion - Position - Velocity Reminders: Register Your Clickers Reading for Tues: 1.2, 1.3 (p.24-28) Reading quiz on Tuesday.](https://reader035.fdocuments.us/reader035/viewer/2022070608/5a4d1b887f8b9ab0599bd67e/html5/thumbnails/2.jpg)
Office Hours & Problem Solving Sessions
Homework too hard to do alone, but ok & learn lot when work together.We will help interactions, coach, NOT give answers.
• Today – Thursday• In Physics Helproom (G2B90) - Enter building opposite Buffalo - Down stairs to basement, - G2B90 across corridor, - Ask anyone if lost
• EH: 1.30 – 2.30pm• JL: 9-11am (for 3 weeks)• PSS: 3.30-5pm at back of room• We want to help you! Let me know if these times are totally incompatible with your schedule
![Page 3: Day 2: Get your clickers ready! Motion - Position - Velocity Reminders: Register Your Clickers Reading for Tues: 1.2, 1.3 (p.24-28) Reading quiz on Tuesday.](https://reader035.fdocuments.us/reader035/viewer/2022070608/5a4d1b887f8b9ab0599bd67e/html5/thumbnails/3.jpg)
Describing motion
We want to understand how and why all sorts of things move: balls, cars, bikes, people, atoms…
But before we get to how or why, we need to be able to describe motion, using words, graphs, equations.
![Page 4: Day 2: Get your clickers ready! Motion - Position - Velocity Reminders: Register Your Clickers Reading for Tues: 1.2, 1.3 (p.24-28) Reading quiz on Tuesday.](https://reader035.fdocuments.us/reader035/viewer/2022070608/5a4d1b887f8b9ab0599bd67e/html5/thumbnails/4.jpg)
Position
Unit: meters (abbreviation m)Meter sticks; sonarSymbol: Often represented by ‘x’
![Page 5: Day 2: Get your clickers ready! Motion - Position - Velocity Reminders: Register Your Clickers Reading for Tues: 1.2, 1.3 (p.24-28) Reading quiz on Tuesday.](https://reader035.fdocuments.us/reader035/viewer/2022070608/5a4d1b887f8b9ab0599bd67e/html5/thumbnails/5.jpg)
Position versus time graphs
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posi
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time
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posi
tion
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1. Person moving away from origin, in straight line at steady speed
Sketch position versus time graphs for:
origin origin
2. Person moving towards origin, in straight line at steady speed
![Page 6: Day 2: Get your clickers ready! Motion - Position - Velocity Reminders: Register Your Clickers Reading for Tues: 1.2, 1.3 (p.24-28) Reading quiz on Tuesday.](https://reader035.fdocuments.us/reader035/viewer/2022070608/5a4d1b887f8b9ab0599bd67e/html5/thumbnails/6.jpg)
Position versus time graphs
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posi
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time
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posi
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1. Person moving away from origin to right, straight line, steady speed
Sketch position versus time graphs for:
origin origin
2. Person moving away from origin to left, straight line, steady speed
![Page 7: Day 2: Get your clickers ready! Motion - Position - Velocity Reminders: Register Your Clickers Reading for Tues: 1.2, 1.3 (p.24-28) Reading quiz on Tuesday.](https://reader035.fdocuments.us/reader035/viewer/2022070608/5a4d1b887f8b9ab0599bd67e/html5/thumbnails/7.jpg)
Distance versus time graphs
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dist
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time
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dist
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time
1. Person moving away from origin to right, straight line, steady speed
Sketch distance versus time graphs for:
origin origin
2. Person moving away from origin to left, straight line, steady speed
![Page 8: Day 2: Get your clickers ready! Motion - Position - Velocity Reminders: Register Your Clickers Reading for Tues: 1.2, 1.3 (p.24-28) Reading quiz on Tuesday.](https://reader035.fdocuments.us/reader035/viewer/2022070608/5a4d1b887f8b9ab0599bd67e/html5/thumbnails/8.jpg)
So……what’s the big difference
between position and distance????
a) No difference – 2 words for the same thing
b) Position includes both distance AND direction
c) Distance includes both position AND direction
d) Position is just about a direction
origin
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![Page 9: Day 2: Get your clickers ready! Motion - Position - Velocity Reminders: Register Your Clickers Reading for Tues: 1.2, 1.3 (p.24-28) Reading quiz on Tuesday.](https://reader035.fdocuments.us/reader035/viewer/2022070608/5a4d1b887f8b9ab0599bd67e/html5/thumbnails/9.jpg)
Scalars and vectors• Distance is a SCALAR quantity
– Fully described by one number e.g. 5m, 1mile etc– Just says how far you are from origin, but not exactly where– Always positive
• Position is a VECTOR quantity– Contains BOTH a number (distance) AND a direction– Says how far you are from origin and in what direction – precisely
describes your location– Can be positive or negative (determined by direction)– Often represented by an arrow
• Length represents magnitude of vector (distance)• Point of arrow give direction.
• IMPORTANT CONCEPT: Many other VECTOR and SCALAR quantities to appear in this course!
![Page 10: Day 2: Get your clickers ready! Motion - Position - Velocity Reminders: Register Your Clickers Reading for Tues: 1.2, 1.3 (p.24-28) Reading quiz on Tuesday.](https://reader035.fdocuments.us/reader035/viewer/2022070608/5a4d1b887f8b9ab0599bd67e/html5/thumbnails/10.jpg)
Speed and velocity• Speed is a scalar quantity
– Says how fast you are moving– Physics units m/s– Always positive
• Velocity is a vector quantity– Says how fast you are moving and in what direction– Physics units m/s– Can be positive or negative depending on direction– Speed is the magnitude or size of the velocity– Often represented by symbol ‘v’
![Page 11: Day 2: Get your clickers ready! Motion - Position - Velocity Reminders: Register Your Clickers Reading for Tues: 1.2, 1.3 (p.24-28) Reading quiz on Tuesday.](https://reader035.fdocuments.us/reader035/viewer/2022070608/5a4d1b887f8b9ab0599bd67e/html5/thumbnails/11.jpg)
Speed experiment: about how fast did the cardboard move? (pick the closest value)
a) 100 m/sb) 10 m/sc) 1 m/sd) 0.1 m/se) 0 m/s
speed = distance it traveled
time it took
Hint:
![Page 12: Day 2: Get your clickers ready! Motion - Position - Velocity Reminders: Register Your Clickers Reading for Tues: 1.2, 1.3 (p.24-28) Reading quiz on Tuesday.](https://reader035.fdocuments.us/reader035/viewer/2022070608/5a4d1b887f8b9ab0599bd67e/html5/thumbnails/12.jpg)
Velocity versus time graphs
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velo
city
time
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velo
city
time
1. Person moving away from origin, in straight line at steady speed
Sketch velocity versus time graphs for:
origin origin
2. Person moving towards origin, in straight line at steady speed