Here are some suggested projects that you can try at home.

Homemade Hovercraft

This is a project that demonstrates a nearly friction less surface.  By creating a thin layer of air beneath the moving object you change sliding friction to fluid friction and reduce friction dramatically.  I often use the hovercraft or air puck to demonstrate Newton's laws in class and this gives you the chance to create one and experiment with it yourself.  This project can be created several different ways and here are a few suggestions that have worked in the past.

Materials:

Balloon
Twist top from a mustard or white glue bottle
Discarded CD

Steps:

1. Using a hot glue gun (be careful) attach the twist top to the CD and let it cool.
2. Pull the balloon over the twist top and hold it on with a rubber band.
3. To use it open the twist top nozzle and hold the base of the CD up to your mouth.  Blow through the hole to fill the balloon.
4. Twist the nozzle closed to hold in the air.
5. Set the CD on the table, twist the nozzle open and let the hovercraft float across the desk.

The twist top can be replaced with a piece of wooden dowel rod with a hole drilled in it, but you won't be able to turn it on and off.
 
 

Homemade Spinning Top

This project demonstrate circular motion.  I use tops to show how planets spin around their axis in my Earth science classes and for changing velocity and acceleration in my Physical science classes.

Materials:

Twist top from a mustard or white glue bottle (8-ounce)
Discarded CD

Steps:
 

1. Turn the twist top to open.
2. Push the twist top through the center of the CD.
3. Close the twist top locking the CD in position between the twist top and the bottle cap.