Here you can explore the physics of the inclined plane. For the mass M, we show all forces, gravity and normal force, acting on it. As you change the angle, you can see how the components of the forces change.
A good collection of science related activities and lessons that could be used for science fairs.Topics include: Astronomy, Biology, Chemistry, Earth Science, Physical Science and Technology.
Students will build a magnetic field viewing bottle from baby oil and steel wool fibers to see the magnetic field align with a magnet. A similar experiment is offered to make an electric field viewing bottle; both experiments yield dramatic results for elementary students. The second link above offers