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Physics 11 Mr. Jean March 30th, 2012
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The plan: Video clip of the day Unbalanced forces
Forces & Acceleration Inclined Plane problems Inclined Planes & 2d forces
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Situation:
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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.?
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HW for Monday: Read pages 188 – 194
Chapter #5 from McGraw-Hill Ryerson.
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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.
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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.
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Draw the “Force Diagram”:
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Acceleration?
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Lessons to follow:
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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?
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Draw the “Force Diagram”:
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Write down the known variables:
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Begin to solve the problem:
Find normal force: NOTE: We must account for upwards pull by rope. (Fvertical will reduce Fn’s load) Fn =
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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.
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Problems to work on: P. 171 Question #11 & 12 Solutions in 20 minutes
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Solutions:
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