Force and Motion
There's three simple laws.
Newtons 1st Law
Newtons 2nd law
Newtons 3rd Law.
An example of a lever is a seesaw. The bar sits in the middle of the fulcrum and when one person sits on it, it goes up and down.
An example of this simple macine is when you pull the rope on a window shade. When you pull each time pull the shade goes up.
A screw is just an inclined plane wrapped around a cylinder.
An example of a screw is a scew. It has the inclined plane wrapped around a cylinder.
Wheel and axle
A wheel and axle is just a bar with a wheel attached to it so they rotate together at the same speed.
An example of a wheel and axle is a ferrice wheel. It has the wheel that spins and the bar that rotates with the wheel.
A wedge is an object having one thick end and tapering to a thin edge that is driven between two objects to separate them.
An example of this machine is a door stopper. When the door stopper goes in between the door and the floor it becomes a wedge.
An inclined plane is a flat surface tilted at an angle with one end higher than the other end.
An example of an inclined plane is a slide. It has one end higher than the other.
Compound machines are machines that uses two or more various machines to make one compound machines.
Let's take a look at a few compound machines.
As you can see the picture below it shows the different simple machines on a wheelbarrow.
Another compound machine is a pencil sharpener.
A pencil sharpener has many different simple machines in one.
When you look at the picture below it will tell you the different simple machines.