Question

relation between downward force and angle of inclination

Answer 1

If a body of mass (say m) is placed over an inclined plane, that is inclined at an angle  with the horizontal, its weight mg acts vertically downward. The component mg cos of the weight acts normally downward on the plane balances the upward normal reaction (say R) of the inclined plane. The component mg sin  of the weight acting parallel to the inclined plane downwards, produces motion in the body. 

Answer 2

Explanation:

When an object is kept on a friction less inclined plane and in absence of external force, then only weight of the object acts downwards.

Consider, angle of the inclined plane as θ

If mass of the object is m, then the weight of the object is mg.

On inclined plane, consider components of the weight. Along the plane,

Fx = mg sin θ

Perpendicular to it, Fy = mg cos θ

Refer to the attached diagram below.

Learn more about: Motion on inclined plane

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