Newton's Laws of Motion - Lesson I.6.4

Key Terms:

Inertia |Galileo's Thought Experiment |

Newton's Second Law of Motion Often stated as: When a net force acts on an object, it accelerates in the direct of the net force. The acceleration varies directly to the net force on it and inversely to its mass. = net force (N) = acceleration m = mass (kg) It is important to reduce the mass of the car to insure maximum acceleration. What is the acceleration of a 1600 kg racecar if the net force was 4500 N? = 4500 N m = 1600 kg What would the acceleration be if the mass was reduced by 150 kg? = 4500 N m = 1450 kg Newton's Third Law of Motion Often stated as: When one object exerts a force on a second object, the second exerts a force on the first that is equal in magnitude but opposite in direction. These forces are called action-reaction forces.        Or For every action force there exists a reaction force that is equal in magnitude but opposite in direction.