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The article presents questions and answers about light. Topics covered include the speed of light, how sunlight changes the color of leaves and plants, rainbows, and light pollution.

The article describes several experiments an individual can perform the better understand the properties of light. One test will prove that light, though it may appear white, is actually made up of all to colors in the color spectrum. One can observe the different colors which are broken up by water. Another experiment is described. INSETS: What you need:;What you need:.

Answers questions about sound. Why whales sing; How cats purr; Why fingernails on a chalk board can hurt the ears.

Offers information on how to make a flute. Materials you will need; Directions on how to cut a straw to make a flute; How blowing into a straw makes vibrations that sound like a flute; How changing the length of the straw changes the pitch.

The article describes a number of experiments an individual can perform to learn more about how gravity works. INSETS: What you need:;What you need:.

The article describes an experiment an individual can perform at home to learn more about force and motion. The experiment involves an individual spinning in a chair and pulling the hands against the body to spin faster. Isaac Newton discovered that the closer the mass of an object is to the center of the spin, the faster the object will spin. INSET: What you need:.

The article discusses the different layers that make up an atom. The electrons go around the nucleus in layers. They can jump from layer to layer if a force effects them. Every atom has a different amount of electrons. This number is the charge of the atom. Niehls Bohr developed a theory called the Quantum Theory in 1913. In 1932 scientists discovered that neutrons are inside the nucleus with the protons. Neutrons have no charge.

The article describes an experiment an individual can perform to better understand the movement of electrons. INSET: What you need:.

The article presents a list of terms and phrases associated with light.

The article describes the various colors of light. There are seven colors in the color spectrum -- red, orange, yellow, green, blue, indigo, and violet. Our eyes are most comfortable looking at green. The white and yellow that we see in sunlight are actually a mixture of all the colors of light.

The article describes hot and cool light. Light comes in many forms, such as in fires and in light bulbs. Different types of light have different energy levels. Sunlight has ultraviolet light, which can harm skin and be unhealthful. Ultraviolet light is powerful because it has a high frequency. Light that gives off heat is called incandescent light. A cool light is luminescent. An example of this would be a fluorescent light.

The article describes how fast light travels. Light travels at about 186,000 miles per second (300,000 kilometers per second), which is faster than anything else. Light is an energy that travels in a wave. Light will not bend unless something bends it like a glass lens or water.

The article describes the benefits of light. Light helps individuals see. When an individual is looking at an object, we are actually seeing light bounce of the object. Sunlight provides energy for plants to grow. Animals eat plants, then humans eat animals.

The article asks questions about light.

Discusses musical instruments and how they are made. How instruments made of wood make different sounds than ones made of brass.

Discusses what factors affect sounds. How frequency can be slow or fast; How people choose sounds they like by their tone; Definition of tone; How sounds that have changing tones or frequencies can sound unpleasant.

Discusses what makes sounds different. How different vibrations make different kinds of sounds; How the rate of the vibration is called the frequency.

Discusses how astronauts are able to talk to people on earth if there is no sound in space. How the sounds astronauts hear are actually sound waves that have been changed into electromagnetic waves and back again.

Discusses where sound can be heard. How sound is everywhere but in a vacuum; How sound travels faster through water than air; Reason why there is no sound in a vacuum such as outer space.

Discusses how sound is a vibration. How sound can be either beautiful or terrible; How people can feel vibrations of loud music.

Focuses on sound. Questions on what sound is and what it is made of; How ears hear sounds and the body feels sound.

The article presents a list of terms and phrases associated with electricity.

The article describes Isaac Newton and Albert Einstein. Isaac Newton figured out why things fall at the same speed, or with different force, by watching an apple fall from a tree. Albert Einstein improved on Newton's research in the study of physics. Physics is the study of heat, light, motion, sound and matter.

The article presents a list of questions and answers regarding astronauts, life in outer space, and the international space station.

The article describes force. The more mass an object has, the more force it takes to move it. The faster an object moves, the more force required to stop it.

The article describes how we could get sick in outer space. Gravity affects our balance. Our ears contain fluid that makes our bodies stay in balance. We feel motion sickness when our bodies are out of balance. This effect can be felt when you spin around in circles then try to stand up straight.

The article describes how gravity makes us strong. Our bones do not stay as strong in space because they are not pushing or pulling anything. If you were in outer space for a long time, your bones would become weaker than on Earth.

The chapter describes where gravity can be found. Gravity is everywhere, even in space. The gravitational pull of the Earth keeps the Space Shuttle in orbit around it. Centrifugal force is discussed.

The article describes the law of gravity. The law of gravity states that the gravitational force between two objects depends on the mass of the two objects and the distance between them. The Earth's gravity is six times greater than the moon because the Earth has more mass.

The article describes how mass and distance affect gravity. The force of gravity depends on the mass of the objects and the distance between them. The Earth is caught in the sun's gravitational pull because the sun is so massive.

The articles describes what gravity looks like. The effects of gravity can be seen when you see objects falling down. In outer space, objects would float because there is less gravity there than on Earth. The effects of gravity is called the gravitational force.

The article describes aspects of simple and complex machines. These machines were designed to make work easier by using less force to accomplish the task.

The article describes the use of complex machines. Complex machines are made of two or more simple machines. A car is a complex machine made up of wheels and axles, levers, and pulleys. All machines make work easier, or efficient.

The article describes the use of wedges. The wedge is simple machine similar to an inclined plane. A wedge consists of two inclined planes put together to form a blunt edge at one end and a sharp edge at the other end. Examples of wedges are axes and knives.

The article describes the use of inclined planes. Inclined planes are simple machines that allow an individual to climb a hill easier because the work is spread out over a longer distance.

The article describes using a wheel and axle. An axle is a shaft that is attached to the center of a wheel. Turning the axle will move the wheels forward. By using this simple machine, an individual can move an object over a great distance.

The article describes using a pulley. The pulley is a simple machine used to lift objects. Flag poles use a pulley system to raise and lower a flag. The more pulleys used to lift an object, the less force an individual needs to expend.

The article describes the lever. Levers are simple machines that can have moving parts or not. A seesaw has a fulcrum in the middle, which holds and balances weight. Other forms of levers are a wheelbarrow, the claw end of a hammer, and piano keys.

The article describes how machines help us perform work. We use machines to make a task easier to accomplish. Simple machines we use to help with work are levers, pulleys, wheels and axles, inclined planes, and wedges.

The article describes how work affects force and motion.

The article describes an electric current and where it comes from. An electric current is the constant flow of electrons through a conductor, like a wire. Power plants make electricity and send it to your house through cables. Currents can come from chemical reactions in batteries or burning coal or oil at power plants. Solar, water, and nuclear power can also create electrical currents.