newton and his laws. friction paragraphs hand up if you have it done
TRANSCRIPT
![Page 1: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/1.jpg)
Newton and his laws
![Page 2: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/2.jpg)
Friction Paragraphs
• Hand up if you have it done
![Page 3: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/3.jpg)
Newton
![Page 4: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/4.jpg)
Life
• Scholar– Brilliant mind– Became Head of Oxford Colleges in England– Royal Society of England– Master everything in his age
• Teacher– Help to develop whole branch of Mathematics– Newtonian physics
• Alchemist
![Page 5: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/5.jpg)
Newton’s laws of motion
• Clearly laid down the rules that govern why things move in our world
• Rules start falling apart when at microscopic scale or at high speeds
![Page 6: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/6.jpg)
1st law of motion
• An object at ______, stays at ______
• An object in motion, stays at a _______ rate
Unless
A net outside ________ acts upon it.
![Page 7: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/7.jpg)
How will their motion compare?
![Page 8: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/8.jpg)
What forces effect their ability to roll down a hallway?
![Page 9: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/9.jpg)
• Friction with ground
• Air Resistance
![Page 10: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/10.jpg)
A bowling ball will move with nearly constant velocity
• No significant friction from the ground or air resistance to help change the bowling ball’s motion
![Page 11: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/11.jpg)
A Tennis ball will slow down
• Both friction and air resistance has a greater effect on the ball.
• It has much less mass
![Page 12: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/12.jpg)
Mass
• Mass of an object = the amount of material that makes up the object
• The more massive the object, the harder it is to change its motion
![Page 13: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/13.jpg)
What Does Inertia mean?
The Res
![Page 14: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/14.jpg)
Inertia is the measure of an object’s resistance to change in
motion
![Page 15: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/15.jpg)
Inertia Trick
• Need– Weight (Washer), quarter– Cup– Index Card
![Page 16: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/16.jpg)
Mass and Inertia
• The more massive an object, the more inertia it has
![Page 17: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/17.jpg)
Sumo and inertia
![Page 18: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/18.jpg)
American Sumo
![Page 19: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/19.jpg)
Assignment for Wednesday
• Find 10 examples in life of objects demonstrating the first law
• 10 different objects, 10 different actions
• Denote if object is stopped, at constant velocity or accelerating
• If accelerating, indicate the cause
![Page 20: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/20.jpg)
2nd Law of motion
• The amount of acceleration of an object is related to:– Its mass
• As mass increases, acceleration decreases
– The net force exerted on it• As net force increases, acceleration increases
![Page 21: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/21.jpg)
a = Fnet
m
Fnet = m a
![Page 22: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/22.jpg)
Units
• Some units that are made out of 2 or more fundamental units are renamed after a Famous Scientist
• Units of Force– 1 Kg (m/s2) = 1N (Newton)
![Page 23: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/23.jpg)
Weight is a force
• Weight is the measure of the Force of gravity
• To find your weight in Newtons:
– Take your weight and divide it by 2.2
– Take the result and multiply it by 9.8
![Page 24: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/24.jpg)
What weighs 1000 N?
![Page 25: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/25.jpg)
Football player (220 lbs)
![Page 26: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/26.jpg)
What weighs 100 N?
![Page 27: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/27.jpg)
Freshman backpacks
![Page 28: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/28.jpg)
What weighs 10 N?
![Page 29: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/29.jpg)
The average textbook
![Page 30: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/30.jpg)
What weighs 1 N?
![Page 31: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/31.jpg)
A smallish apple
![Page 32: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/32.jpg)
Homework in book
• What force is necessary to accelerate a 1250 kg car at a rate of 40 m/s2?
![Page 33: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/33.jpg)
Answer?
• Have m, a
• Need F
• Use f = ma
• F= 1250 x 40 = 50,000 N
![Page 34: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/34.jpg)
Question #2
• What is the mass of an object if a force of 34N produces an acceleration of 4 m/s2?
![Page 35: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/35.jpg)
Answer #2
8.5 kg
![Page 36: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/36.jpg)
Mathematical equation for Weight of an object
• Weight =
mass x acceleration due to gravity
On earth’s surface, acceleration due to gravity is = to 10 m/s2
![Page 37: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/37.jpg)
Calculate your mass value
• Take your weight in Newtons and divide by 10
![Page 38: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/38.jpg)
Acceleration due to gravity
• Paper and Book test
• Which drops faster?
• Any other forces at work besides gravity (weight)?
![Page 39: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/39.jpg)
New Homework
• Page 369– Problems 22-29
![Page 40: Newton and his laws. Friction Paragraphs Hand up if you have it done](https://reader035.vdocuments.site/reader035/viewer/2022062309/5697c01d1a28abf838cd09b5/html5/thumbnails/40.jpg)
Newton’s 3rd Law
• For every __________, there is an equal and opposite ________
• If the action force is a pen pressing against a piece of paper, then the reaction force is_______