Review!!!!!!!!!!!!!!

Let's look at everything we've learned!

If you leave with nothing else, know only this:

Simple machines make work easier.

Ok, here we go:

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.

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6. Lever 

 Frank was the 1st person to use a teeter totter.

1st Class: Frank's Favorite  Lever

                Force    Fulcrum Load

Fido is a 2 foot tall elf. 
Frank is always trying to steal his wheelbarrow.

2nd Class: Fido's Lever, Frank!
                      Force Load   Fulcrum 

 3rd Class: Flo's Favorite Lever
                  Fulcrum Force Load

Th- Th- Th- Th- Third Class Levers!!!!!

Third Class Levers are so cool, dude!

 Remember: We use FORCE instead of EFFORT. 

So, a 3rd Class Lever is:

Load           Force           Fulcrum

Here are some real life examples:

 

SECOND CLASS LEVERS!!!!!!!!!!!!!!!!!!!!!

You're going to love these!

SECOND CLASS LEVERS!

Remember: We use FORCE for EFFORT. 

So......

A 2nd Class Lever is:

FORCE              LOAD          FULCRUM

Here are some real life examples:

Levers!

We're going to learn about the first of three levers: 

the First Class Lever!

Let's look at this website to see some neat animations!

http://www.enchantedlearning.com/physics/machines/Levers.shtml

First Class Levers:

But in this picture, they use the word EFFORT instead of FORCE.

What things do we use that are 

First Class Levers?

Possible Answers: 

-see saw (teeter totter)

-balance scale

-railroad handcart

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.

____________________________________________________________

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. 

_________________________________________________________

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. 

________________________________________________

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.

___________________________________________________________________

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.

What do you call an inclined plane that's wrapped around a post?

A SCREW!!!!!

 

 The most common place we've seen a screw is in a hardware store.

Look at this spiral staircase.

 

We know that stairs are inclined planes. 

So, when an inclined plane is wrapped around a post, it's a screw!

Did you know that the screw exists in many more places?

Here are some examples:

 Maybe it's on your jar of vegetables?

Look! A light bulb is a screw!

What about the drink you had at the basketball game? 

The top is a screw, too!

This is called an auger. 

It's a screw we use to drill into the ground.

Inclined Planes!

Oh, hello again!

Welcome back to my classroom.

Let's look at INCLINED PLANES!

Wow, inclined planes really make work easier!

What real-life examples can you think of?