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Frictional Force.

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Presentation on theme: "Frictional Force."— Presentation transcript:

1 Frictional Force

2 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

3 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 Randy Courtney Lionel Perryon Kendall Christine Khrisjan Isaiah Akiara Asia Ty Annamaria Alexandria Tareek Malik D Diane Christie Carmani BLACK DESKS ONLY: None

4 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 Joslyn Tashauna Taliyah Jalen Gary Tyreke Amari Stephanie Cathie Sammiyah Gammoni Jordan Brooklyn Kenosha Brittany J Devin Dre Tylauna Jayla Calvin Brandie Sanquan BLACK DESKS ONLY: Teki

5 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

6 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

7 8 Find your assigned seat Start on your Do Now for points
BOARD Find your assigned seat Start on your Do Now for points Shavonna Jada Sa’koyia Anbriana Cameron O Cameron P Nick R Ahmari Chris F Richard Colay Essence Alvin Camille Hayley Kiyem Antonio Candie Jamal Lance Tazion Dacia Kyree Diante Jakyyah Johneda Nesha Johnny Ms. King desk Cabinets computers: Jeannie, Courtney

8 Quiz – No Talking What is the unit of Force?
What is the name of the force applied through ropes? Which is the weakest of all elementary forces but reaches the farthest? Draw a force vector of 25 N upward. Scale: 1 box = 5 N

9 Media Clip  7:40 to 8:38 https://www.youtube.com/watch?v=bkHd6cSz104
NEEDS: questions

10 5.1 Gravity The force of gravity on an object is called weight.
At Earth’s surface, gravity exerts a force of 9.8 N on every kilogram of mass.

11 5.1 Weight vs. mass Weight and mass are not the same.
Mass is a property of matter measured in kilograms (kg). Weight is a force measured in newtons (N). Weight depends on mass and gravity.

12 Weight depends on mass and gravity
A 10-kilogram rock has the same mass no matter where it is in the universe. On Earth, the10 kg. rock weighs 98 N.. On the moon, the same rock only weighs 16 N.

13

14 CFU What is the mass of a 20 N rock?
What is the weight of a chair that has a mass of 5.5 kg?

15 5.2 Friction Friction is a force that resists the motion of objects or surfaces. Many kinds of friction exist.

16 5.2 Friction

17 5.2 Friction and two surfaces
Friction depends on both of the surfaces in contact. When the hockey puck slides on ice, a thin layer of water between the rubber and the ice allows the puck to slide easily.

18 5.2 Identifying friction forces
Friction is a force, measured in newtons just like any other force. Static friction keeps an object at rest from moving.

19 5.2 Identifying friction forces
Sliding friction is a force that resists the motion of an object moving across a surface.

20 5.2 A model for friction Friction depends on a material’s properties such as roughness, how clean the surfaces are, and other factors. The greater the force squeezing two surfaces together, the greater the friction force.

21 5.2 Reducing the force of friction
Unless a force is constantly applied, friction will slow all motion to a stop eventually. It is impossible to completely get rid of friction, but it can be reduced.

22 5.2 Using friction Friction is also important to anyone driving a car.
Grooved tire treads allow space for water to be channeled away from the road-tire contact point, allowing for more friction in wet conditions.

23 5.2 Using friction How do you think these shoes increase friction?
Shoes are designed to increase the friction between their soles and the ground. How do you think these shoes increase friction?

24 5.2 Friction and energy Friction changes energy of motion into heat energy.

25 5.2 Friction and energy Each time two moving surfaces touch each other, tiny bits of material are broken off by friction. Breaking off bits of material uses energy.

26 Task 2 Task 1 Pg. 116 Create Vocabulary Flip-Chart
Word/Definition/Visual Example Words: Force Tension Extension Compression Contact Force Complete questions #1-6 Write the question and the answer inside your journal

27 Quiz – No talking! 60 kg 12 kg 20 kg A? B? C? What is the weight of box A, box B, and box C? Show your work.

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