Physics 11 Advanced Mr. Jean April 12 th, 2012. The plan: Video clip of the day Inclined planes Quest Assignment reminder 2d force questions.

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Presentation transcript:

Physics 11 Advanced Mr. Jean April 12 th, 2012

The plan: Video clip of the day Inclined planes Quest Assignment reminder 2d force questions

How did you sleep last night?

Inclined Plane Intro:

Inclined Planes Force Diagrams: Step #1: –Draw the coordinate system with the x-axis parallel to the ramp. Step #2: –Let the direction pointed downwards be in the positive direction.

Step #3: –Break the diagram into it’s components. F g = Force of gravity perpendicular to inclined plane. F g = Force of gravity parallel to inclined plane. Step #4: –The force of gravity will remain the force of gravity regardless of what we do to the situation, thus we can solve for the component of the normal force.

Force Diagram with components:

Situation: Emma is standing on an icy hill holding a heavy box. The slope of the hill is 30 degrees. Their combined mass is 100kg. Brooklyn gives Emma a small push which starts Emma’s down hill motion. The kinetic coefficient of friction between Emma and the ice is 0.3. –A) What is Emma’s acceleration? –B) How long will it take Emma to slide 500m? –C) At what speed is Emma traveling at after 500m of sliding?

Force Diagram

Known Implied Unknown

Newton’s Second Law: Apply second law perpendicular to ramp to find the supporting force of the ramp.

Newton’s Second Law: Apply second law parallel to ramp to find the acceleration down the ramp.

B) How long will it take Emma to slide 500m? Eq #4?

C) At what speed is Emma traveling at after 500m of sliding?

To do: P. 208 –#25 –#36 P. 213 –#35