1. Machines make a job easier. 2. F A light bulb is a kind of lever.

A screwdriver increases force by exerting the output force over a shorter distance.

This force is called the input force. A wheel and axle does not change the direction of the input force. However, the force put out by the machine, called the output force, is either greater than the input force or else applied over a greater distance.

Wheel and axle, basic machine component for amplifying force. In its earliest form it was probably used for raising weights or water buckets from wells. Its principle of operation is demonstrated by the large and small gears attached to the same shaft, as shown at A in the illustration.

A screw is an inclined plane wrapped in a spiral around a cylindrical post.

The wheel and axle is a machine consisting of a wheel attached to a smaller axle so that these two parts rotate together in which a force is transferred from one to the other.

thread. The inclined plane that is wrapped around and protrudes from the shaft of a screw. traction. The amount of friction between two surfaces that allows one surface to travel across another. wedge.

In order to calculate the mechanical advantage of a wheel and axel, you can divide the radius of the wheel by the radius of the axle. If a wheel’s radius is 60cm and its axle is 30cm, what is the mechanical advantage of the wheel and axle? The output force of the wheel and axle is 2 times greater than the input force.

pulley. a grooved wheel with a rope wrapped around it. compound machine.

In a Class Three Lever, the Force is between the Load and the Fulcrum. If the Force is closer to the Load, it would be easier to lift and a mechanical advantage. Examples are shovels, fishing rods, human arms and legs, tweezers, and ice tongs. A fishing rod is an example of a Class Three Lever.