Let's review what we've learned so far!

Let's review what simple machines we've learned about so far:

1. Wheel and Axle

Here's a real life example:

Let's look at the wheel and axle scientifically again:

Figure 1 shows force and load like the wheels on a bike or car.

Figure 2 shows force and load like a car's steering wheel or a doorknob.

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2. Pulley

Here's a real life example:

Let's look at the pulley scientifically:

On a pulley system, pulling down on the rope is the force and what we're pulling up is the load. 

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3. Wedge

Here's a real life example:

Let's look at this scientifically:

 Imagine the green wedge in the picture is an axe going into wood. 

The force is the effort you used to hit the wood with the axe.

The load is the axe head. 

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4. Inclined Plane

 Here's a real life example:

 

Let's look at the inclined plane scientifically:

 

So in this picture, the force is you pushing the the box, or load, up the inclined plane.

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5. Screw

Let's look at a real life example:

Let's look at the screw scientifically:

We can see the load is the screw and the force is the effort used to screw it into the wood.