Simple Machines

1. Work

1.1. Using a force to move an object a distance (when both the force and the motion of the object are in the same direction.)

1.2. W=F*D

1.3. Joule

1.4. Force being applied to an object

1.5. Simple machines reduce the amount of work that needs to be done

2. Power

2.1. The rate of doing work

2.2. P = W / t

2.3. Watt

2.4. Lightbulb

2.5. Simple machines reduce the amount of power that is used to do something

3. Mechanical Advantage

3.1. The ratio of the output force (acting on a load) produced by a machine to the applied effort (the input force).

3.2. Actual: output/input Ideal: input/output

3.3. No units

3.4. How much a wheelbarrow helps

3.5. Mechanical advantage shows how much work a simple machine is doing

4. 1st Class Levers

4.1. A lever in which the fulcrum is positioned between the load and the effort.

4.2. Crowbar

4.3. A 1st class lever is a simple machine.

5. 2nd Class Levers

5.1. A lever in which the load lies between the fulcrum and the effort.

5.2. Seesaw

5.3. A 2nd class lever is a simple machine.

6. 3rd Class Levers

6.1. A lever in which the effort is placed between the fulcrum and the load.

6.2. Baseball bat

6.3. A 3rd class lever is a simple machine.

7. Inclined Planes

7.1. A plane whose angle to the horizontal is less than a right angle.

7.2. Ramp

7.3. An inclined plane is a simple machine that makes it easier to move objects upwards.

8. Wedge

8.1. An inclined plane turned on its side.

8.2. Axes

8.3. An wedge is a simple machine that makes it easier to lift, or cut objects

9. Screw

9.1. A spirally grooved solid cylinder and a correspondingly grooved hollow cylinder into which it fits.

9.2. Screw

9.3. A screw is a simple machine that can help hold things together, and set them into place.

10. Pulley

10.1. A wheel over which a pulled rope or chain runs to change the direction of the pull used for lifting a load.

10.2. A pulley

10.3. A pulley is a simple machine that can make it easier to move things through equal distribution of weight.

11. Wheel and Axle

11.1. A simple machine consisting of an axle to which a wheel is fastened so that torque applied to the wheel winds a rope or chain onto the axle, yielding a mechanical advantage equal to the ratio of the diameter of the wheel to that of the axle.

11.2. Doorknob

11.3. A wheel and axle is a simple machine that can make it simpler to twist and move objects.