I Have to create a working model machine, it has to have three simple machines in it; any ideas?The model has to have three working simple...

All machines are composed of simple machines.  A simple
machine is a device that changes the direction or magnitude of a force.  Simple machines
are devices that make the work required easier, or multiply it, causing more work to be
done than normal.  There are six (6) types of simple machines, listed
below:

1. Lever- a lever is a movable bar which works
against a fixed point called a fulcrum.  Levers are useful for prying things, such as
using a screwdriver to open a paint can lid.

2. Wheel and
Axle- a wheel and axle is a basically a large circumference wheel surrounding and
connected to a small circumference wheel.  Think of a bicycle tire's outer rim and the
axle it is connected to.

3. Pulley- pulleys are wheel and
axle combinations that use a rope, chain, or a series of ropes/chains to both change the
direction a force is applied and the magnitude of the force
used.

4. Inclined Plane- an inclined plane is a fixed
incline device that divides the height something is to be lifted (or lowered) over a
linear distance, literally rise/run.  A set of stairs is a good example of an inclined
plane.

5. Wedge- a wedge is a double combination of
inclined planes put together to deliver a "splitting" force; a wedge used to split
firewood is a good example.

6. Screw- a screw is a
combination of a wheel and axle and an inclined plane.  Screws are used to increase the
force used to hold something up or together, such as screws used in the construction
industry.

For ideas about a model working machine, pick any
machine in your house and examine it for examples of the six simple machines mentioned
above.  Decide what your machine will do and design the construction using any three of
the simple machines listed here.  Feel free to borrow what you observe with the machines
in your home.