UNIT 3 Forces Newtons Laws of Motion HONORS

UNIT 3 Forces & Newton’s Laws of Motion

HONORS – TUESDAY 11/19 Upcoming: • Physics Fun Fact! – Scott Kelly Newton’s Law Video Newton’s Law Quiz • Pass back Unit 2 Test (Fri/Mon) • (absent? Take it now!) Newton’s 2 nd Law Lab Friction Lab • Newton’s Law Video After Break: Toothpick Bridge Project • Groups of 3 Physics Fun Fact • Research Newton’s Laws of Motion. Create a video Presentations teaching each law with a visual demonstration for each.

CONCEPTUAL – TUESDAY 11/19 • Physics Fun Fact! – Scott Kelly • Pass back Unit 2 Test • (absent? Take it now!) • Newton’s Law Video • Groups of 3 Upcoming: Newton’s Law Video Newton’s Law Quiz (Fri/Mon) Friction Lab After Break: Toothpick Bridge Project Physics Fun Fact Presentations • Research Newton’s Laws of Motion. Create a video teaching each law with a visual demonstration for each.

HONORS – THURSDAY 11/21 • Physics Fun Fact! – Scott Kelly • Discuss Newton’s Laws • Types of Forces • Weight vs. Mass • Complete 2 nd Law Lab • Newton’s Law Quiz Next Class Upcoming: Newton’s Law Quiz (Next Class) Free Body Diagram Homework After Break: Free Body Diagram Quiz (12/3 & 12/4) Friction Lab Toothpick Bridge Project Physics Fun Fact Presentations

CONCEPTUAL – THURSDAY 11/21 • Physics Fun Fact! – Scott • Discuss Newton’s Laws • 2 nd Law Lab discussion • Free Body Diagrams • Station introduction Upcoming: Newton’s Law Quiz (Next Class) Kelly Free Body Diagram Homework (due next class) After Break: Free Body Diagram Quiz (12/3 & 12/4) Friction Lab Toothpick Bridge Project Physics Fun Fact Presentations • Formative. (1 st page homework due fri/mon) • Newton’s Law Quiz Next Class

HONORS – FRIDAY 11/22 • Newton’s Laws Quiz • Physics Fun Fact! – Scott Kelly • Free Body Diagrams • 2 nd Law Lab Recap • #4 on Warm Up • FBD Homework (all pages) Upcoming: Free Body Diagram Homework After Break: Free Body Diagram Quiz (12/3 & 12/4) Friction Lab Toothpick Bridge Project Physics Fun Fact Presentations

CONCEPTUAL – FRIDAY 11/22 • Physics Fun Fact! – Scott Kelly • Newton’s Laws Quiz • Continue Free Body Diagrams • Complete Worksheet 2 • Balanced Forces/Equilibrium Upcoming: Free Body Diagram Homework After Break: Free Body Diagram Quiz (12/3 & 12/4) Friction Lab Toothpick Bridge Project Physics Fun Fact Presentations

SIR ISAAC NEWTON • 1643 – 1727 England • Described as a Natural Philosopher • Mathematician, Physicist, Author, Astronomer. • Created Calculus • Founded the Laws of Motion & Law of Universal Gravitation. • https: //www. youtube. com/watch? v=D 6_UVBAfd. HA

FORCE • A force is a push or pull acting upon an object as a result of its interaction with another object. There a variety of types of forces. Force is a Vector quantity. • Measured in Newtons [N] • Types of Forces: • Frictional Force • Tension Force • Normal Force • Air Resistance Force • Gravitational Force • Magnetic Force • Etc.

FRICTION • Friction is the resistance to motion of one moving object relative to another. • Types of Friction: Static Friction – Force that keeps an object at rest. Must be overcome to move an object Kinetic Friction: • Sliding Friction – Force that resists the movement of a sliding object • Rolling Friction – Force that resists the movement of a rolling object • Liquid Friction – Force that resists the movement of an object through a liquid

NEWTON’S LAWS OF MOTION • First Law – An object in motion or at rest will remain in motion or at rest until acted on by an outside force • Second Law – F = ma • Third Law – For every action, there is an equal but opposite reaction

WEIGHT VS. MASS • Mass – Amount of matter an object contains. Doesn’t change. • Weight – The pull of gravity on an object. Weight is a Force. W = mg Unit: 2 [N] Gravity on Earth = 9. 8 m/s Gravity on the Moon = 1. 62 m/s 2 To convert your Weight (N) to Weight (lbs) you can convert using the method to the left.

INERTIA • The tendency to do nothing or to remain unchanged • Represented by Newton’s 1 st Law of Motion • Mass directly effects an object’s Inertia • https: //www. youtube. com/watch? v =7 COUk 5 eh 6 j. Y

FREE BODY DIAGRAMS • Also known as Force Diagrams • A universal way of notating and communicating Forces acting on an object. • Net Force (Sum of Forces) – A numerical combination of all forces acting on an object.

BALANCED & UNBALANCED FORCES • Balanced forces – Will NOT move an object • Normal Force – Book sitting on a desk • 2 students applying equal forces to opposite sides of a box • Unbalanced forces – Will move an object • 1 student pushing a box, accelerating it • A ball falling through air

ATWOOD MACHINE • Invented by Mathematician George Atwood in 1784 as a laboratory experiment to verify mechanical laws of motion with a constant acceleration. • Created after Newton’s laws of motion • When solving an Atwood Machine problem, ALWAYS begin with an analysis of Sum of Forces.

FRICTION LAB Part 1 Part 2 • Measure Static & Kinetic Frictions • Add 0. 5 kg (Total mass = 1 kg) • Use different surface areas • Measure Static & Kinetic Frictions on wide side only • 500 g (0. 5 kg) Part 3 Part 4 • Add 0. 5 kg (Total mass = 1. 5 kg) • Using 3 different surfaces, observe friction at different angles. • Measure Kinetic Friction at different speeds • USE CARDBOARD AS INSTRUCTED!!

BRIDGE PROJECT • Groups of 3 students • Materials: • 1 sheet wax paper • 100 toothpicks • Elmer's Glue Thur sday Test 12/6 Bridg es & Sum m b egin a t i (Lap ve w top C rite u p arts in cla ss) • Must hold 1 textbook (each extra will be a bonus) • Testing distance: 10 Inches • Toy car must be able to drive through