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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 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 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 suggests Web sites where an individual can learn more about physics.

The article presents a list of terms and phrases associated with force, motion, and simple machines.