1. Physics 11
Mr. Jean
March 30th, 2012

2. The plan: Video clip of the day Unbalanced forces
Forces & Acceleration
Inclined Plane problems
Inclined Planes & 2d forces

3. Situation:

4. Questions:
Using the image of Wile E. Coyote, determine the following values.
1) What is the coefficient of friction?
2) What is the mass of the rocket & Wile E.?
3) What is the acceleration of Wile E.?

8. HW for Monday: Read pages 188 – 194
Chapter #5 from McGraw-Hill Ryerson.

9. Example: Old TV’s and computer monitors produce pictures by firing electrons into a screen. The viewers sees the electron as a light change and this creates the resulting image.

11. TV Example: An electron with mass 9
TV Example: An electron with mass 9.1 x 10-31kg is accelerated from rest. Find the velocity of the electron if it experiences 5.8x10-15 N over a distance of m.

12. Draw the “Force Diagram”:

13. Acceleration?

15. Lessons to follow:

16. Forces in two-dimensions:
A 45kg crate is being pulled eastwards horizontally across the floor. The coefficient of friction is 0.2. You pull the crate with a force of 115 N at an angle of 15 degrees. What is the acceleration?

18. Draw the “Force Diagram”:

19. Write down the known variables:

20. Begin to solve the problem:
Find normal force:
NOTE: We must account for upwards pull by rope. (Fvertical will reduce Fn’s load)
Fn =

22. Find Force of Friction:
Ff = is opposing the horizontal acceleration
Once we find Ff we can then compare the Fnet to determine the horizontal motion.

24. Problems to work on:
P. 171
Question #11 & 12
Solutions in 20 minutes

25. Solutions: