1. Six Simple Machines

2. Simple Machines Simple machines are the six machines on which all other machines are based. –Lever –Wheel & Axle –Pulley –Inclined Plane –Wedge –Screw

3. Lever A solid bar that rotates, or turns, around a fixed point. The bar can be straight or curved. The fixed point is called the fulcrum.

4. Levers AMSTI Demonstration

5. Wheel & Axle A Simple machine made of a wheel attached to a shaft, or axle. Effort applied to the wheel turns the axle, or effort applied to the axle turns the wheel. They move together.

6. A wheel with a grooved rim and rope or cable that rides in the groove. As you pull on the rope, the wheel turns. Remember the Pulley lab from yesterday. Fixed and Movable Pulley’s

7. Inclined Plane It can be difficult to lift a heavy object straight up because it’s too heavy. Using a ramp or inclined plane makes work easier.

8. Wedge A simple machine that has a thick end and thin end. Wedges are used to cut, split, or pierce objects—or to hold objects together. It is a type of inclined plane.

9. Screw An inclined plane wrapped around a cylinder or cone to form a spiral. Can be used to raise and lower weights as well as to fasten objects. The advantage of using a screw instead of a nail to hold things together is friction keeps the screw from turning and becoming loose.

10. Mechanical Advantage The mechanical advantage of a machine can be calculated. Mechanical = Output Force AdvantageInput Force The formula works for ALL Machines!

11. Practice Problem If the output force of a machine is 600 N, and the input force is 200 N. What is the mechanical advantage of the machine? MA= Ouput Input MA= 600 N 200 N MA= 3

12. Review Questions 1.What are the 6 types of simple machines and give an example of each. 2.How do you calculate mechanical advantage?