This lesson introduces the learner to the concepts of distance and displacement and explains how to differentiate between the two. It is 3 of 3 in the series titled "Introduction to Distance and Displacement."

This lesson will introduce the concept of friction and explain how it can affect forces. It is 4 of 5 in the series titled "Friction."

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."

Need some practice drawing free-body diagrams? This slideshow lesson gives several examples of different situations and the forces that need to be shown in the free-body diagram.

This lesson provides the learner with examples on how to properly define a system, when solving physics problems. It is 2 of 2 in the series titled "Practice w/ Systems."

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 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 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."