Equilibrium 5.3 10 minutes! Do now: If you had a car with a mass of 458g, what is its weight? If you took your car (mass=458g) and brought it to the Moon, what would its mass be? Which of Newton's laws applies to the following scenarios: An astronaut uses a fire extinguisher to propel herself over to a satellite. When I add more weight to my car it moves slowly. My marker will remain on my desk until someone moves it. Equilibrium 5.3 10 minutes!

Jamya, Cooper, Breonna, Matthew, Sapphira, Justice, Christian 1 BOARD Find your assigned seat Start on your Do Now for points Ms. King desk Cabinets Kenneth Torien Donovan Davon B Destiney H Dearell Terronda Kiana Chiarrah Tayia Eddie Diamond Steven C Sierra Rhyannon Mikesha Nyri Alexia Mirisa Isaiah Elijah Ronica Darius Kenjy Denice Kanisha Jordan H Damion BLACK DESKS ONLY: Jamya, Cooper, Breonna, Matthew, Sapphira, Justice, Christian

2 Find your assigned seat Start on your Do Now for points BOARD Find your assigned seat Start on your Do Now for points Ms. King desk Cabinets Donquavis Semaj Cedric Tyquan Destini Deondre Jakeria Desean Carun Diane Lionel Perryon Kendall Christine Khrisjan Isaiah Akiara Asia Ty Annamaria Alexandria Tareek Malik D Courtney Christie Carmani BLACK DESKS ONLY: None

4 Find your assigned seat Start on your Do Now for points BOARD Find your assigned seat Start on your Do Now for points Ms. King desk Cabinets Raheem Terrell Lakahla Deondra Brooklen Ivory Tashauna Taliyah Jalen Gary Tyreke Amari Stephanie Cathie Sammiyah Gammoni Jordan Joslyn Kenosha Brittany J Devin Dre Tylauna Jayla Calvin Brandie Sanquan BLACK DESKS ONLY: Teki

6 Find your assigned seat Start on your Do Now for points BOARD Find your assigned seat Start on your Do Now for points Ms. King desk Cabinets Whitney L Kenya Joshua Emely S Jasmine H Derreonte Kyceem Xavier Darius M Jovon Cornel M Billy Khai Tyrah Jonothan Chaiashia Diamond Crystal Sammiyah Stephen Sarah M Jasmine D Justen F. Zachary G BLACK DESKS ONLY: None

Erika G, Raven S, Cayla S, Michelle, Tiffany, Raven M 7 BOARD Find your assigned seat Start on your Do Now for points Nelson Carrie Amir Regina D Ah’Drevious Shakira Cianne Taylor John M Diane Alexis Jamauri Destiney M Zakera Keniya Faith Gabriella Shantrell Tyler W Jakquese Raquan Caitilyn Russell Ty Jonothan Lakeioria Khayla S Briana E. emogie Ms. King desk Cabinets BLACK DESKS ONLY: Erika G, Raven S, Cayla S, Michelle, Tiffany, Raven M

8 Find your assigned seat Start on your Do Now for points BOARD Find your assigned seat Start on your Do Now for points Essence Lance Sa’koyia Shavonna Anbriana Cameron P Nick R Ahmari Chris F Richard Colay Johneda Alvin Camille Hayley Kiyem Antonio Candie Jamal Cameron O Tazion Dacia Kyree Diante Jakyyah Jada Nesha Johnny Noemi Ms. King desk Cabinets Black desks: Jeannie, Courtney

Present your shoe! 10 minutes! Come up and present your shoe to the class for extra credit. Talking point: What is the name of your shoe? Which surfaces is it designed for? Why?

MOTIVATION VIDEO

Expectations for Notes 10 minutes! C – only with elbow buddy H – textbook page 124 A – notes on Equilibrium M – none; raise your hand to get up P – everyone! SUCCESS!

5.3 Forces and Equilibrium 15 minutes! 5.3 Forces and Equilibrium The sum of all the forces on an object is called the net force. The word net means total but also means the direction of the forces has been taken into account. In what direction will this plane go?

5.3 Adding forces To figure out if or how an object will move, we look at ALL of the forces acting on it. Four forces act on a plane: weight drag (air friction) the thrust of the engines, and the lift force caused by the flow of air over the wings.

5.3 Equilibrium When several forces act on the same object: The net force is zero, or The net force is NOT zero.

5.3 Normal forces When the forces are balanced, the net force is zero. When the net force on an object is zero, we say the object is in equilibrium.

5.3 Equilibrium and normal forces A normal force is created whenever an object is in contact with a surface. The normal force has equal strength to the force pressing the object into the surface, which is often the object’s weight. The normal force is sometimes called the support force.

5.3 The free body diagram How do you keep track of many forces with different directions? Draw a free-body diagram that contains the objects, like a book on a table.

5.3 Solving equilibrium problems For an object to be in equilibrium, all the forces acting on the object must add up to zero. Is this object in equilibrium?

Solving Problems Two chains are used to support a small boat weighing 1,500 newtons. One chain has a tension of 600 newtons. What is the force exerted by the other chain?

Upward force of chains = weight of boat 600 N + tension2 = 1,200 N Solving Problems Solution: Draw free body diagram Upward force of chains = weight of boat 600 N + tension2 = 1,200 N tension2 = 900 N

Check for Understanding #1 If you push down on a table with a force of 5 Newtons, what is the normal force pushing back on you?

Check for Understanding #2 A child weighing 200 N is sitting in the center of a swing. The swing is supported evenly by two ropes, one on each side. What is the tension force in one of the ropes?

Check for Understanding #3 A train is climbing a gradual hill. The weight of the train creates a downhill force of 150,000 newtons. Friction creates an additional force of 25,000 newtons acting in the same direction (downhill). How much force does the trains engine need to create so the train is in equilibrium?

Group Project 10 minutes In groups of two: Pick a scenario Draw the scenario Draw allllll the forces acting on the object/person Tell me if all the forces acting upon the object are balanced or unbalanced

Example This picture shows balanced forces acting upon a plane. How could I show this unbalanced?

Word, Definition, Picture or Visual Example Vocabulary Flip Chart Newton Friction Net Force Balanced Force Equilibrium Normal Force Word, Definition, Picture or Visual Example

Write the question and the answer. Pg.129 Write the question and the answer. #1,3, 5, 6, 9 **If you copy you will receive a “0” there will be no other verbal warning