Friction Books Experiment

Last week our class conducted an experiment where we wanted to know which materials increased friction and decreased friction.  First, we pushed a heavy book only on a cardboard and recorded our observations.  Second, we pushed the heavy book on the cardboard over some pencils and recorded our observations.  Lastly, we pushed the heavy book on the cardboard over some marbles and again, recorded our observations. 

We concluded that the marbles had the reduced friction because they are round and smooth and rolled easily on the carpet.  The cardboard alone had the most (increased) friction because the cardboard did not slide easily when pushed.

Force & Motion

Let's review all we know about force and motion.

1. Here you will review force & motion such as friction, gravity, inertia and don't forget magnetism!

	BrainPOP Jr. Simple Machines
	BrainPOP Jr. Gravity
	BrainPOP Jr. Pushes and Pulls BrainPOP Jr. Magnets BrainPOP Work BrainPOP Power BrainPOP Newton's Laws of Motion BrainPOP Inclined Plane

2.  Watch this Bill Nye YouTube video on friction:

:	3.  Watch this Billy Nye YouTube Video on gravity: 4.  Play this interactive Harcourt game on gravity. 5.  Watch this video -  Bill Nye the Science Guy - A Gravity Demonstration