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The inclined plane consists of a smooth plane hinged to a base so that it can be set at any desired angle. Consider a heavy metal roller connected to a scale pan by a light extensible string passing over a frictionless pulley resting on the plane as shown in the figure given below.
If a body of mass (say m) is placed over an inclined plane, that is inclined at an angle θ with the horizontal, its weight mg acts vertically downward. The component mg cos θ of the weight acts normally downward on the plane balances the upward normal reaction (say R) of the inclined plane. The component mg sin θ of the weight acting parallel to the inclined plane downwards, produces motion in the body.
If total weight W1=m1g moves the body up and total weight W2 = m2g makes the body move down,
Then the downward force acting on the body along the inclined plane,
which must be equal to
Thus, a graph between sin θ along X-axis and W along Y-axis must be a straight line.
Simulator Procedure (as performed through the Online Labs)
Real Lab Procedure: