1. November 4 physics physics Gateway High School Olycasts Gateway High School Olycasts

2. Table of Contents #. Date Title-Page – Page Number 20. October 5/6 Newtons Laws - 53 21.October 7/8 Newtons Law Problems – 55 22. October 11/12 Newtons Second Law Lab - 58 23. October 14/15 Newtons Second Law Lab II - 61 24. October 18/19 Newtons Law Quiz - 63 25.October 20/21 Friction – 65 26.October 22/November 1 Friction II - 68 27.November 2/3 Mu of the Shoe Lab- 73 28.November 5 Friction Quiz- 75 1

3. In: A 3 kg book slides across a table and decelerates to a stop. The acceleration is -5 m/s 2. What is the force of friction on the table? What is the force of friction on the table? What is the µ of the table/book combination? What is the µ of the table/book combination?

4. Objective: To Show our understanding of the force of friction To Show our understanding of the force of friction Success criteria: To be able to solve friction equations using F f, F n, and μ To be able to solve friction equations using F f, F n, and μ

5. Lab Results Which type of shoe had the highest mu? Why was that? Which type of shoe had the highest mu? Why was that?

6. Turn in homework and lab write ups Turn in homework and lab write ups

7. Ignoring the slippery when wet sign, a 150 kg man steps carelessly. What is the coefficient of friction if the force of friction was 25 N? Ignoring the slippery when wet sign, a 150 kg man steps carelessly. What is the coefficient of friction if the force of friction was 25 N?

8. A glacier has a mass of 5x10 10 kg and moves at a constant velocity of.5 m/day. If the force of friction between glacier and rock is.2, what is the force of friction scraping the rock below the glacier?

9. Slip tech is a product that treats surfaces to make them less slippery. If a 200 kg man stepped on each of these materials, how much more force of friction would he have with this product? Slip tech is a product that treats surfaces to make them less slippery. If a 200 kg man stepped on each of these materials, how much more force of friction would he have with this product?

10. A 20 N block is being pushed across a horizontal table by an 18 N force. If the coefficient of kinetic friction between the block and the table is 0.4, find the acceleration of the block.

11. A 55 N block is being pushed across a horizontal table by an 25 N force. If the coefficient of kinetic friction between the block and the table is 0.2, find the acceleration of the block.

12. A 20 N block is being pushed across a horizontal table by an 18 N force. If the coefficient of kinetic friction between the block and the table is 0.4, find the acceleration of the block. a) 0.5 m/s 2 b) 1 m/s 2 c) 5 m/s 2 d) 7.5 m/s 2 e) 9 m/s 2

13. Friction Video

14. Quiz

15. OOO What still confuses you about friction? Out: