Monday, November 2, 2015 Unit Question What role do forces play in the world around us? Guiding Question / Learning Target What are the Newton’s 3 Laws of Motion Warm-up What is acceleration? Agenda 1.Newton’s 3 Law’s of Motion 2.Modern Marvels Car Crash and Newton Practice Homework 1.Quiz Friday A change in velocity from slowing down, speeding up, or changing direction.

Newton’s Laws of Motion

Newton’s 1 st Law: Inertia An objects resistance to any change in motion. Objects with greater mass have greater inertia.

Newton’s Law of Inertia A body (object) at rest will stay at at rest; a body in motion will stay in motion.

Inertia Examples:

Newton’s Second Law Force = mass x acceleration (F = m x a)

F = m x a Force, mass, and acceleration are all connected. –For any object, the greater the force applied to it, the greater its acceleration will be.

Learning Checkpoint Calculate the force on an object that has a mass of 12 kg and an acceleration of 4 m/s/s. F = m x a F = 12 kg x 4 m/s/s F = 48 kg x m/s/s = 48 N F ma

Learning Checkpoint What is the acceleration of a 200 kg object with 3,000 N of net force acting on it? a = F / m a = 3,000 kg x m/s/s / 200 kg a = 15 m/s/s F ma

Newton’s Third Law To every action there is an equal and opposite reaction. –Remember: Action-Reaction Forces are NOT the same as balanced or unbalanced forces. Balanced or unbalanced forces act on the same object, sometimes resulting in its motion. Action-Reaction forces act on two different objects.

Learning Checkpoint When a force is exerted on a box, an equal and opposite force is exerted by the box. These forces are known as action-reaction forces.

Examples: