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Motion Energy and Simple
Machines
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Isaac Newton first published his three laws of motion in 1687 in Philosophiae Naturalis Principia Mathematica. These mathematic principles have stood the test of time. They have been used as the groundwork for a lot of further investigation into physics by other scientists.
TeacherTech explains the laws in fun and easy-to-understand terms.
Newton's first law is also called the law of inertia. It says, "A body continues to maintain its state of rest or of uniform motion unless acted upon by an external unbalanced force." In other words, an object will not start or stop moving unless something else causes it to do so. Another familiar way to say it is, objects that are at rest stay at rest, and those that are in motion stay in motion.
The second law says that when m is an object's mass, a is the object's acceleration, and F is the applied force, F = ma. The greater the force applied to an object, and the less mass the object has, the faster it will move. It takes less force to move an object that has little mass. An applied force is a force that one object applies to another.
The most well known of Newton's laws of motion is the third one. It is usually stated as,
"To every action there is an equal and opposite reaction." Every time something moves, there is an equal force in the opposite direction back onto the object that caused the movement.
Home Science Tools
Simple ideas for demonstrating each law
Physics Demonstrations
A long list of experiments with directions and explanations
Newton's Three Laws of Motion
An eighth grade lesson plan
Martha Stewart and Newton
Martha talks to a physics professor who demonstrates Newton's laws
Energy, in simple terms, is usually defined as the ability to do work. Understanding and using energy is a major part of the field of physics. Many types of energy exist, including light, potential, gravitational, and kinetic energy. These are explained in basic terms at
Scientific Forms of Energy.
What is Energy?
An extensive list of activities and experiments
Energy Science Fair Projects
Organized into categories like wind energy, biodesel, wood energy, and more
Simple machines are things that use energy to make work easier without having moving parts. There are six different kinds of simple machines. They are the pulley, wheel and axle, lever, wedge, screw, and inclined plane.
Simple Machines
A great resource for elementary lesson plans and activities
Edheads
Fun online activities that explain simple and complex machines
Equipment Lease Machines and ways companies
finance them to enhance business
ProTeacher
Another wonderful list of lesson plans and experiments
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