1. Simple Machines Pulley, Screw, and Wheel & Axel Pulley, Screw, and Wheel & Axel the six types of simple machines are the lever, wheel and axle, inclined plane, wedge, screw, and pulley

2. Simple Machines Amachine is something that makes work easier by changing the size of a force needed, the direction of the force needed, or the distance over which a force acts. Amachine is something that makes work easier by changing the size of a force needed, the direction of the force needed, or the distance over which a force acts.

3. Wedge Wedge – a V-shaped object whose sides are two inclined planes sloped toward each other Wedge – a V-shaped object whose sides are two inclined planes sloped toward each other uses: uses: lift things lift things separate things separate things tighten and attach things tighten and attach things Examples - ??? Examples - ???

4. Inclined plane inclined plane – a slanted surface along which a force moves an object to a different elevation Examples - ???

5. Screw Screw – an inclined plane wrapped around a cylinder Screw – an inclined plane wrapped around a cylinder Examples - ???? Examples - ????

6. Simple Machines a machine is something that makes work easier by changing the size of a force needed, the direction of the force needed, or the distance over which a force acts. a machine is something that makes work easier by changing the size of a force needed, the direction of the force needed, or the distance over which a force acts.

7. Work Machines do not decrease the amount of work, they lower the force that is needed to do the same work by increasing the distance the force is applied. Machines do not decrease the amount of work, they lower the force that is needed to do the same work by increasing the distance the force is applied. Work – the product of force and distance Work – the product of force and distance Work is done when a force acts on the object in the direction the object moves. Work is done when a force acts on the object in the direction the object moves. w = F xd w = F xd work = Force x distance work = Force x distance

8. examples of Work w = F xd w = F xd work = applied force x distance work = applied force x distance A box weighs 450 N and a boy lifts it 1 m into the back of a truck. How much work is done to move the box? 450 N x 1 m = 450 J (Joules)

9. examples of Work cont. Now think of it this way…. A girl moves the box instead of the boy but she uses an inclined plane that is 3 m long to move the box into the back of the truck using only 150 N of force. How much work has been done to move the box? w = F xd w = 150 N x 3 m w = 450 J (Joules)

10. Both the boy and the girl did the same amount of work, but the girl used less force to do the same amount of work. Who had the advantage??? Why??