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4. Friction: Kinetic Friction: Static Problem-Solving With Friction and Inclines Friction The Laws of Motion: Applications of Newton's La... > Friction Free to share, print, make copies and changes. Get yours at www.boundless.com www.boundless.com/physics?campaign_content=book_4071_section_56&campaign_term=Physics&utm_campaign=powerpoint&utm_medium=di rect&utm_source=boundless

5. Kinetic (or dynamic) friction occurs when two objects are moving relative to each other and rub together (like a sled on the ground). Friction: Kinetic Free to share, print, make copies and changes. Get yours at www.boundless.com www.boundless.com/physics/textbooks/alternative-to-physics-principles-and-problems-paul-zitzewitz-0078458137-9780078458132/the-laws-of- motion-applications-of-newton-s-laws-of-motion-5/friction-56/friction-kinetic-252- 7734?campaign_content=book_4071_section_56&campaign_term=Physics&utm_campaign=powerpoint&utm_medium=direct&utm_source=boun dless Friction View on Boundless.com The Laws of Motion: Applications of Newton's La... > Friction

6. The force of friction can be represented by an equation [Equation 1]where [Equation 2] is the coefficient of friction and is a unitless number that represents the strength of the friction of the surface. The Laws of Motion: Applications of Newton's La... > Friction Free to share, print, make copies and changes. Get yours at www.boundless.com www.boundless.com/physics/textbooks/alternative-to-physics-principles-and-problems-paul-zitzewitz-0078458137-9780078458132/the-laws-of- motion-applications-of-newton-s-laws-of-motion-5/friction-56/friction-kinetic-252- 7734?campaign_content=book_4071_section_56&campaign_term=Physics&utm_campaign=powerpoint&utm_medium=direct&utm_source=boun dless Equation 1 View on Boundless.com Equation 2 View on Boundless.com

7. Kinetic friction and static (stationary) friction use two different coefficients for the same material. Free to share, print, make copies and changes. Get yours at www.boundless.com www.boundless.com/physics/textbooks/alternative-to-physics-principles-and-problems-paul-zitzewitz-0078458137-9780078458132/the-laws-of- motion-applications-of-newton-s-laws-of-motion-5/friction-56/friction-kinetic-252- 7734?campaign_content=book_4071_section_56&campaign_term=Physics&utm_campaign=powerpoint&utm_medium=direct&utm_source=boun dless The Laws of Motion: Applications of Newton's La... > Friction

8. Static friction is a force that acts to resist the start of motion. It is borne of macroscopic inconsistencies in the surfaces of materials in contact as well as intermolecular interactions between the materials, such as hydrogen bonding, Van der Waal's interactions and electrostatic interactions. Static friction uses a different, usually higher, coefficient than kinetic friction does. Friction: Static Free to share, print, make copies and changes. Get yours at www.boundless.com www.boundless.com/physics/textbooks/alternative-to-physics-principles-and-problems-paul-zitzewitz-0078458137-9780078458132/the-laws-of- motion-applications-of-newton-s-laws-of-motion-5/friction-56/friction-static-253- 419?campaign_content=book_4071_section_56&campaign_term=Physics&utm_campaign=powerpoint&utm_medium=direct&utm_source=boundl ess Static Friction View on Boundless.com The Laws of Motion: Applications of Newton's La... > Friction

9. The force of static friction is [Equation 3]. Where μs is the coefficient of static friction which varies by material and Fn is the normal force. The Laws of Motion: Applications of Newton's La... > Friction Free to share, print, make copies and changes. Get yours at www.boundless.com www.boundless.com/physics/textbooks/alternative-to-physics-principles-and-problems-paul-zitzewitz-0078458137-9780078458132/the-laws-of- motion-applications-of-newton-s-laws-of-motion-5/friction-56/friction-static-253- 419?campaign_content=book_4071_section_56&campaign_term=Physics&utm_campaign=powerpoint&utm_medium=direct&utm_source=boundl ess Equation 3 View on Boundless.com

10. Motion on an incline is resisted by friction. Problem-Solving With Friction and Inclines Free to share, print, make copies and changes. Get yours at www.boundless.com www.boundless.com/physics/textbooks/alternative-to-physics-principles-and-problems-paul-zitzewitz-0078458137-9780078458132/the-laws-of- motion-applications-of-newton-s-laws-of-motion-5/friction-56/problem-solving-with-friction-and-inclines-254- 4752?campaign_content=book_4071_section_56&campaign_term=Physics&utm_campaign=powerpoint&utm_medium=direct&utm_source=boun dless Block and incline system View on Boundless.com The Laws of Motion: Applications of Newton's La... > Friction

11. The frictional force on an incline is dependent on the angle of the incline. [Equation 4] is the maximum friction force on an incline. The Laws of Motion: Applications of Newton's La... > Friction Free to share, print, make copies and changes. Get yours at www.boundless.com www.boundless.com/physics/textbooks/alternative-to-physics-principles-and-problems-paul-zitzewitz-0078458137-9780078458132/the-laws-of- motion-applications-of-newton-s-laws-of-motion-5/friction-56/problem-solving-with-friction-and-inclines-254- 4752?campaign_content=book_4071_section_56&campaign_term=Physics&utm_campaign=powerpoint&utm_medium=direct&utm_source=boun dless Equation 4 View on Boundless.com

12. If the friction force is greater than or equal to the forces in the direction of motion, then the net force is 0 and the object is in equilibrium. Free to share, print, make copies and changes. Get yours at www.boundless.com www.boundless.com/physics/textbooks/alternative-to-physics-principles-and-problems-paul-zitzewitz-0078458137-9780078458132/the-laws-of- motion-applications-of-newton-s-laws-of-motion-5/friction-56/problem-solving-with-friction-and-inclines-254- 4752?campaign_content=book_4071_section_56&campaign_term=Physics&utm_campaign=powerpoint&utm_medium=direct&utm_source=boun dless The Laws of Motion: Applications of Newton's La... > Friction

13. Free to share, print, make copies and changes. Get yours at www.boundless.com Appendix

14. Key terms equilibrium The state of a body at rest or in uniform motion, the resultant of all forces on which is zero. friction A force that resists the relative motion or tendency to such motion of two bodies in contact. incline A slope. kinetic Of or relating to motion kinetic energy The energy possessed by an object because of its motion, equal to one half the mass of the body times the square of its velocity. static Fixed in place; having no motion. Free to share, print, make copies and changes. Get yours at www.boundless.com The Laws of Motion: Applications of Newton's La...

15. Friction Frictional forces, such as f, always oppose motion or attempted motion between objects in contact. Friction arises in part because of the roughness of the surfaces in contact, as seen in the expanded view. In order for the object to move, it must rise to where the peaks can skip along the bottom surface. Thus, a force is required just to set the object in motion. Some of the peaks will be broken off, also requiring a force to maintain motion. Much of the friction is actually due to attractive forces between molecules making up the two objects, so that even perfectly smooth surfaces are not friction-free. Such adhesive forces also depend on the substances the surfaces are made of, explaining, for example, why rubber-soled shoes slip less than those with leather soles. Free to share, print, make copies and changes. Get yours at www.boundless.com Connexions. CC BY 3.0 http://cnx.org/content/m42139/latest/Figure_06_01_01a.jpg View on Boundless.comCC BY 3.0http://cnx.org/content/m42139/latest/Figure_06_01_01a.jpgView on Boundless.com The Laws of Motion: Applications of Newton's La...

16. Kinetic Friction Introduction Here, I'll explain the microscopic justification of friction and what we can know about it. The coefficient of friction, too! Free to share, print, make copies and changes. Get yours at www.boundless.com View on Boundless.com The Laws of Motion: Applications of Newton's La...

17. Static Friction and some friction challenges Here, I talk about sneaky ol' static friction. Free to share, print, make copies and changes. Get yours at www.boundless.com View on Boundless.com The Laws of Motion: Applications of Newton's La...

18. Block and incline system Forces on the block Free to share, print, make copies and changes. Get yours at www.boundless.com Connexions. CC BY 3.0 http://cnx.org/content/m14079/latest/ai15.gif View on Boundless.comCC BY 3.0http://cnx.org/content/m14079/latest/ai15.gifView on Boundless.com The Laws of Motion: Applications of Newton's La...

19. Static Friction To move a block at rest on a surface, a force must be applied which is great enough to overcome the force of static friction. Free to share, print, make copies and changes. Get yours at www.boundless.com Connexions. CC BY 3.0 http://cnx.org/content/m14068/latest/f2.gif View on Boundless.comCC BY 3.0http://cnx.org/content/m14068/latest/f2.gifView on Boundless.com The Laws of Motion: Applications of Newton's La...

20. Free to share, print, make copies and changes. Get yours at www.boundless.com The Laws of Motion: Applications of Newton's La... What is a consequence of converting kinetic energy to heat via friction? (1) Rubbing wood together to start a fire, (2) Melting ice in a glass but stirring with a straw, (3) Brakes stop a car A) (1), (2), (3) B) (1), (2) C) (2), (3) D) (1), (3)

21. Free to share, print, make copies and changes. Get yours at www.boundless.comwww.boundless.com Boundless - LO. "Boundless." CC BY-SA 3.0 http://www.boundless.com/CC BY-SA 3.0http://www.boundless.com/ The Laws of Motion: Applications of Newton's La... What is a consequence of converting kinetic energy to heat via friction? (1) Rubbing wood together to start a fire, (2) Melting ice in a glass but stirring with a straw, (3) Brakes stop a car A) (1), (2), (3) B) (1), (2) C) (2), (3) D) (1), (3)

22. Free to share, print, make copies and changes. Get yours at www.boundless.com The Laws of Motion: Applications of Newton's La... What is the force of friction given a coefficient of friction of 60% and natural force of 2 N? A) 120 N B) 1.2 N C) 3.33 N D) 30 N

23. Free to share, print, make copies and changes. Get yours at www.boundless.comwww.boundless.com Boundless - LO. "Boundless." CC BY-SA 3.0 http://www.boundless.com/CC BY-SA 3.0http://www.boundless.com/ The Laws of Motion: Applications of Newton's La... What is the force of friction given a coefficient of friction of 60% and natural force of 2 N? A) 120 N B) 1.2 N C) 3.33 N D) 30 N

24. Free to share, print, make copies and changes. Get yours at www.boundless.com The Laws of Motion: Applications of Newton's La... How does the coefficient of kinetic friction generally relate to the coefficient of static friction? A) The coefficient of kinetic friction is usually less than the the coefficient of static friction B) The coefficient of kinetic friction is usually more than the coefficient of static friction C) The coefficient of kinetic friction is equal to static friction D) There is no relationship between coefficient of kinetic friction and static friction

25. Free to share, print, make copies and changes. Get yours at www.boundless.comwww.boundless.com Boundless - LO. "Boundless." CC BY-SA 3.0 http://www.boundless.com/CC BY-SA 3.0http://www.boundless.com/ The Laws of Motion: Applications of Newton's La... How does the coefficient of kinetic friction generally relate to the coefficient of static friction? A) The coefficient of kinetic friction is usually less than the the coefficient of static friction B) The coefficient of kinetic friction is usually more than the coefficient of static friction C) The coefficient of kinetic friction is equal to static friction D) There is no relationship between coefficient of kinetic friction and static friction

26. Free to share, print, make copies and changes. Get yours at www.boundless.com The Laws of Motion: Applications of Newton's La... How does static friction differ from kinetic friction? A) Static friction acts to resist the motion of a moving object, unlike kinetic friction B) Static friction acts to resist the start of motion, unlike kinetic friction C) The force of static friction is given by a coefficient multiplied by normal force, unlike kinetic D) The coefficient of static friction is usually less than coefficient of kinetic friction

27. Free to share, print, make copies and changes. Get yours at www.boundless.comwww.boundless.com Boundless - LO. "Boundless." CC BY-SA 3.0 http://www.boundless.com/CC BY-SA 3.0http://www.boundless.com/ The Laws of Motion: Applications of Newton's La... How does static friction differ from kinetic friction? A) Static friction acts to resist the motion of a moving object, unlike kinetic friction B) Static friction acts to resist the start of motion, unlike kinetic friction C) The force of static friction is given by a coefficient multiplied by normal force, unlike kinetic D) The coefficient of static friction is usually less than coefficient of kinetic friction

28. Free to share, print, make copies and changes. Get yours at www.boundless.com The Laws of Motion: Applications of Newton's La... Given the coefficient of static friction is 50% and the normal force is 10 N, what is the maximum force of static friction? A) 5 N B) 500 N C) 0.2 N D) 20 N

29. Free to share, print, make copies and changes. Get yours at www.boundless.comwww.boundless.com Boundless - LO. "Boundless." CC BY-SA 3.0 http://www.boundless.com/CC BY-SA 3.0http://www.boundless.com/ The Laws of Motion: Applications of Newton's La... Given the coefficient of static friction is 50% and the normal force is 10 N, what is the maximum force of static friction? A) 5 N B) 500 N C) 0.2 N D) 20 N

30. Free to share, print, make copies and changes. Get yours at www.boundless.com The Laws of Motion: Applications of Newton's La... How does frictional force affect the motion of the block? A) When the block is being pushed up the incline, the frictional force moves up the incline B) When the block is resting on an incline, the frictional force resists the block from sliding C) When the block is being pulled down the incline, the frictional force will slide the block down D) When the block is equal to the gravitational force, the frictional force will slide the block down

31. Free to share, print, make copies and changes. Get yours at www.boundless.comwww.boundless.com Boundless - LO. "Boundless." CC BY-SA 3.0 http://www.boundless.com/CC BY-SA 3.0http://www.boundless.com/ The Laws of Motion: Applications of Newton's La... How does frictional force affect the motion of the block? A) When the block is being pushed up the incline, the frictional force moves up the incline B) When the block is resting on an incline, the frictional force resists the block from sliding C) When the block is being pulled down the incline, the frictional force will slide the block down D) When the block is equal to the gravitational force, the frictional force will slide the block down

32. Free to share, print, make copies and changes. Get yours at www.boundless.com The Laws of Motion: Applications of Newton's La... How does the maximum frictional force of friction relate to the force of gravity? A) Maximum frictional force must be greater than or equal to force of gravity B) Maximum frictional force must be less than or equal to force of gravity C) Maximum frictional force must be equal to force of gravity D) Maximum frictional force must be greater than force of gravity

33. Free to share, print, make copies and changes. Get yours at www.boundless.comwww.boundless.com Boundless - LO. "Boundless." CC BY-SA 3.0 http://www.boundless.com/CC BY-SA 3.0http://www.boundless.com/ The Laws of Motion: Applications of Newton's La... How does the maximum frictional force of friction relate to the force of gravity? A) Maximum frictional force must be greater than or equal to force of gravity B) Maximum frictional force must be less than or equal to force of gravity C) Maximum frictional force must be equal to force of gravity D) Maximum frictional force must be greater than force of gravity

34. Attribution Wikipedia. "Friction." CC BY-SA 3.0 http://en.wikipedia.org/wiki/Friction#Static_frictionCC BY-SA 3.0http://en.wikipedia.org/wiki/Friction#Static_friction Wiktionary. "friction." CC BY-SA 3.0 http://en.wiktionary.org/wiki/frictionCC BY-SA 3.0http://en.wiktionary.org/wiki/friction Wiktionary. "static." CC BY-SA 3.0 http://en.wiktionary.org/wiki/staticCC BY-SA 3.0http://en.wiktionary.org/wiki/static Wiktionary. "kinetic." CC BY-SA 3.0 http://en.wiktionary.org/wiki/kineticCC BY-SA 3.0http://en.wiktionary.org/wiki/kinetic Connexions. "Motion on accelerated incline plane(application)." CC BY 3.0 http://cnx.org/content/m14079/latest/CC BY 3.0http://cnx.org/content/m14079/latest/ Connexions. "Working with friction (application)." CC BY 3.0 http://cnx.org/content/m14806/latest/CC BY 3.0http://cnx.org/content/m14806/latest/ Wiktionary. "friction." CC BY-SA 3.0 http://en.wiktionary.org/wiki/frictionCC BY-SA 3.0http://en.wiktionary.org/wiki/friction Wiktionary. "incline." CC BY-SA 3.0 http://en.wiktionary.org/wiki/inclineCC BY-SA 3.0http://en.wiktionary.org/wiki/incline Wiktionary. "equilibrium." CC BY-SA 3.0 http://en.wiktionary.org/wiki/equilibriumCC BY-SA 3.0http://en.wiktionary.org/wiki/equilibrium Wikipedia. "Friction." CC BY-SA 3.0 http://en.wikipedia.org/wiki/FrictionCC BY-SA 3.0http://en.wikipedia.org/wiki/Friction Connexions. "Friction." CC BY 3.0 http://cnx.org/content/m42139/latest/CC BY 3.0http://cnx.org/content/m42139/latest/ Wikipedia. "kinetic energy." CC BY-SA 3.0 http://en.wikipedia.org/wiki/kinetic%20energyCC BY-SA 3.0http://en.wikipedia.org/wiki/kinetic%20energy Wikipedia. "Friction." CC BY-SA 3.0 http://en.wikipedia.org/wiki/Friction#Kinetic_frictionCC BY-SA 3.0http://en.wikipedia.org/wiki/Friction#Kinetic_friction Free to share, print, make copies and changes. Get yours at www.boundless.com The Laws of Motion: Applications of Newton's La...