Demonstrate friction and inertia, Newton's First Law of Motion that states that an object resists any change in its motion until a force acts upon the object, by demonstrating the tablecloth trick. This simple trick is accomplished by simply yanking a tablecloth out from under a place setting, such as a dinner plate, saucer and glass, without destroying the place setting. This proves that objects at rest, tend to stay at rest as friction acts on the objects to stay in place.
Demonstrate the science of gravity by spinning a marble upside-down in a wine glass. Place a marble inside the glass and spin the glass to get the marble to spin inside. Gradually tilt the glass while still spinning the marble and continue to do so until the glass is upside down. The marble continues to spin inside the glass, demonstrating the inertia of the spinning marble. Both the glass and the marble create a relative gravitational force.
Learn about vibrations by conducting the "rod" demonstration. Hold an approximately 5/8 inch in diameter aluminum rod that is about 24 inches long in the middle with your first and second fingers. Use rosin, a type of resin used on violins, to slide your thumb and index fingers across the rod from the middle to the end of the rod. Keep on repeating this process until you hear the sound of the vibrations. The repeated stick and sliding is what causes the vibrations in the bar.
See how UV rays are blocked with a demonstration that uses brownish/orange UV blocking prescription bottles and some color-changing UV beads, also known as solar beads. UV beads change color when exposed to sunlight. When you place the beads inside the bottle, the colorful beads turn white because the light is blocked.
Demonstrate how polymer molecules work by using a plastic zip-lock bag, water and pencils. Fill the plastic bag half full with water and hold the top of the bag. Simply push several sharp pencils halfway through the bag, making sure not to poke through the other side. The water does not seep through because the polymers that give the bag its stretchy properties, enable the plastic to seal back around the pencil.
Break a bar of "Ivory" soap, which has air whipped into it during the manufacturing process, into several pieces and place the pieces in the middle of a piece of paper towel. Microwave the pieces on high for about two minutes and watch as it expands into a puffy cloud shape. When you remove the soap from the microwave, notice that when you touch it, it is puffy but rigid. As the temperature of a gas increases, so does its volume. This is a demonstration of Charles' Law, which states that volume increases as temperature of a gas increases. Therefore, when the soap is heated, the molecules of air in the soap move far away from each other, thereby causing the soap to expand.
Use a raw egg, salt and water to conduct a demonstration about density. Dissolve about 4 tbsp. of salt in 2 cups of water. Pour 2 cups of tap water in another glass. Gently drop an egg into each of the glasses and notice how the egg floats in the salty water but sinks in plain water. This happens because salt water is denser than regular water.
See density at work by creating a tower of layers of different liquids. Use a tall, clear, 500 mL or 1000 mL graduated cylinder and 50-100 mL each of vegetable oil, rubbing alcohol, tap water, milk, maple syrup and honey. Start by pouring the honey into the cylinder followed by slowly pouring the maple syrup, milk, water, vegetable oil then the rubbing alcohol. Allow the layers settle and notice that they remain in the order you poured them because of the varying densities of each liquid.