27_inclined - Lesson 27: Gravity on Inclined Planes You...

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Lesson 27: Gravity on Inclined Planes You need to be especially careful when you are doing problems involving gravity pulling something down a slope. The physics involved is considerably more complex than it might first seem, mostly because everything is tilted. Let’s look at a standard question of gravity on an inclined plane (slope) to see how we would figure it out. Example 1 : Determine the acceleration of a 15 kg box down a 30° slope if the coefficient of friction is 0.13 on this surface. The first thing we should do is sketch a free body diagram of the situation. There are a few special things you have to notice about this diagram: Force due to Gravity (F g ) is pointing straight down. Even though we are on a slope nothing will ever change that gravity points straight down. The only reason for this box to move down the slope will be a component of gravity's force. Normal Force (F N ) Remember that a normal force is always perpendicular to the surface that you are on. Since this surface is slanted at a bit of an angle, the normal force will also point at a bit of an angle. In these questions
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This note was uploaded on 12/02/2011 for the course PHYSICS 235 taught by Professor Staff during the Fall '08 term at Rutgers.

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27_inclined - Lesson 27: Gravity on Inclined Planes You...

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