This lesson introduces Newton's Second Law and explains that force is equal to mass times acceleration. It is 3 of 3 in the series titled "Newton's Second Law."

This lesson introduces Newton's First Law, that inertia causes objects at rest to remain at rest, and objects in motion to remain in motion. It is 3 of 3 in the series titled "Newton's First Law."

This presentation explains why an object remains at rest, despite the fact that the particles within the object are in motion.

This lesson will show that when a force is exerted on an object, an equal and opposite force is produced, as stated in Newton's Third Law. It is 3 of 3 in the series titled "Newton's Third Law."

This lesson explains how momentum is related to Newton's second law of motion.

This lesson introduces the concept a systems and explains why it is important to properly define a system. It is 2 of 2 in the series titled "Introduction to a System."

This lesson introduces the concept of the free-body diagram. It is 2 of 2 in the series titled "Free-Body Diagram."

This lesson demonstrates how to draw free-body diagrams for objects at rest or sliding on an inclined plane. It is 2 of 2 in the series titled "Representing Forces on an Inclined Plane."

Tom Richey offers a thorough slideshow incorporatin Sir Isaac Newton's Third Law of Motion while reviewing the historic details of the Counter-Reformation. Find out who disagreed with the Reformation movement.

Good site explaining the laws of planetary motion and ellipses

This presentation explains why a poorly defined system can lead to incorrect answers in physics problems.

This lesson explains what forces are acting on objects which are at rest or moving in a rope and pulley system. It is 2 of 2 in the series titled "Forces in a Rope & Pulley System."

This lesson demonstrates how to find the net force acting on objects, at rest or, sliding across inclined planes. It is 2 of 2 in the series titled "Inclined Planes & Net Force."

This lesson explains what forces are action on objects which are sliding across an inclined plane. It is 2 of 2 in the series titled "Objects Sliding on an Inclined Plane."

At this site from Cornell University, Kepler's three laws of planetary motion are stated. There are brief explanations of each. The laws are applied to explain the features of planetary orbits as well as the motion of binary star...

An exhaustive (very exhaustive) biographical account of Johannes Kepler. Describes at length his upbringing, childhood, education, personality and scientific endeavors. Focus is on his development of a cosmological model and the laws of...

This site provides directions for a basic activity that allows students to explore Newton's Third Law of Motion.

In this online lesson plan students can experience Newton's Laws of Motion in relation to rockets with this experiment.

In this online lesson plan students can experience Newton's Laws of Motion in relation to rockets with this experiment.

(1642-1727) English natural philosopher, mathematician, and physicist most famous for gravity and his laws of motion.

This image shows Johannes Kepler, a German astronomer famous for his laws of planetary motion. Check out our Johannes Kepler facts page for more information.

A key figure in the scientific revoluion, a German astrologer, astronomer, and mathematician of famed brilliance. He is best known for his laws of planetary motion.