Simple Machines Foldable Pay attention Simple Machines Simple

Simple Machines Foldable Pay attention

Simple Machines �Simple machines assist us in doing work by creating a mechanical advantage. �They do not change the amount of work; they lower the effort force �There are 6 types of simple machines: lever, inclined plane, pulley, wedge, screw, and wheel and axle. �Most machines are a combination of two or more simple machines.

Inclined Plane �Inclined planes are ramps. �The length of the ramp is the effort distance (de), while the height of the ramp is the resistance distance (dr). �The weight of the object is the resistance force. �The force you apply is the effort force. �The length of the ramp is always greater than the height.

Pulleys �Pulleys consist of a supporting cable and a rotating wheel. �Pulleys change the size, direction, or both of the input force. �An easy way to determine the mechanical advantage of a pulley is to count the number of strings supporting the weight. �The weight is the resistance force �The distance the weight is lifted is the resistance distance. �The actual distance you pull the cable is the effort distance.

Levers �Levers consist of an arm that rotates around a fixed point known as the fulcrum. �There are 3 classes of levers. �The effort distance is measured from the fulcrum to where the effort force is applied. �The resistance distance is measured from the fulcrum to where the weight (resistance force) is located.

MA Calculation Examples �A 600 N television is moved up a ramp. The ramp is 2. 0 m high and 6. 0 m long. Find the mechanical advantage of the ramp.

�A 30 kg object is lifted by a system of pulleys. If 100 N of force is required to lift the object, then what is the mechanical advantage of the pulley system.

�A lever is used to lift a 40 N object. If you exert 10 N of force to accomplish this, what is the mechanical advantage of the lever?