If you are teaching elementary school children about force and inertia, you can be more effective by providing the kids with an interactive project that will show them how everyday materials -- such as a toilet paper roll and a balloon -- can be used to make a race car that speeds across the room. You can construct this fast race car in a few minutes, and the kids will enjoy watching as you instruct them about simple physics.
Things You'll Need
Hot glue gun or hot glue stick
2 craft wheel sets with axles
Toilet paper tube
Squeeze a pea-sized dollop of hot glue onto the middle of an axle for a set of craft wheels.
Press the glued area onto a toilet paper roll, placing it about 1 inch from the end.
Repeat this process, placing a second glued set of wheels onto the toilet paper roll, placing it about 1 inch from the free end of the roll.
Let the hot glue cool and harden completely.
Place a piece of double-sided tape onto the side of a balloon.
Insert the balloon into the toilet paper tube, and stick the tape to the inside of the tube.
Blow up the balloon until it fills the toilet paper tube, and clamp the end with a clothespin.
Place the car onto a flat surface, and release the clothespin to see the car race across the surface.
By placing the balloon inside of the toilet paper tube, instead of on top of it, it will cause the car to go faster.