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The sine of the angle times the weight of your box is the component of the weight along the plane's surface.

The cosine of 20 times 215 will give you the component perpendicular the plane. (also called the normal force)

Think of this to help you remember.

If the angle were tiny, like 3 degrees, then almost all the weight would be against (perpendicular to) the plane, and almost none would be making it slide down (parallel to the surface) The cosine of 3 degrees is almost 1 (as large as it can be. cos of zero is one, that is it's maximum value). Sin of 3 is almost zero.

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Q: A 215 N box is placed on an inclined plane that makes a 20.0 angle with the horizontal Find the component of the weight force parallel to the plane's surface?
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