Newton’s Laws of Motion
Newton's Laws of motion are taught in almost every school physics course. At the time Newton published them they were an exceptional insight into the physics of motion.
The first law highlights the fact that frictional forces inhibit all motion on Earth and that gravity is a constant force everywhere on Earth. Without these an object will remain still or move in a straight line at a steady speed.
The second law relates the force applied to an object to the the acceleration it gains.
The third law is the one most often quoted (to every action there is a equal and opposite reaction). The Law is widely used in the physics of collisions and "explosions".
There are a number of video lessons on Newton's Laws and other aspects of motion available to buy on flash drive, here.