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inclined plane
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A diagram of an inclined plane shows a block resting on a sloped surface. The angle of inclination is labeled theta, with arrows representing the force parallel to the plane (F) and the weight acting downward (W). A diagram displays six types of simple machines with labeled illustrations: inclined plane, wedge, screw, lever, wheel and axle, and pulley, each shown with real-world examples like ramps, axes, screws, seesaws, door handles, and pulleys lifting objects.
What is a simple machine?
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A diagram of an inclined plane shows a block resting on a sloped surface. The angle of inclination is labeled theta, with arrows representing the force parallel to the plane (F) and the weight acting downward (W).
inclined plane In this representation of an inclined plane, D represents a block to be moved up the plane, F represents the force required to move the block, and W represents the weight of the block. Expressed mathematically, and assuming the plane to be without friction, F = W sin θ.

inclined plane

simple machine
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inclined plane, simple machine consisting of a sloping surface, used for raising heavy bodies. The force required to move an object up the incline is less than the weight being raised, discounting friction. The steeper the slope, or incline, the more nearly the required force approaches the actual weight. Expressed mathematically, the force F required to move a block D up an inclined plane without friction is equal to its weight W times the sine of the angle the inclined plane makes with the horizontal. Referring to the Figure, F = W sin θ.

The principle of the inclined plane is used widely—for example, in screws and bolts, where a small force acting along a slope can produce a much larger force.