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Applying Newton's Three Laws

Problems

The Normal Force

Frictional Forces

Problem :

A block of 10N rests on a plane inclined 45 o . In addition a horizontal force of 10N is applied to the block. What is the normal force applied by the inclined plane?

We solve the problem by drawing a free body diagram, and resolving all force vectors into components parallel and perpendicular to the plane:

Solution 1
The component of the gravitational force perpendicular to the plane is given by:

F Gâä¥ = F Gsin 45 o = 10 sin 45 o = 7.07N    

Similarly, the component of the applied force perpendicular to the plane is:

F âä¥ = F sin 45 o = 10 sin 45 o = 7.07N    

Thus the normal force on the block is simply the sum of the two perpendicular forces, or 14.14N .

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