2 I. FORCES – 3.1What is force?1. Please Define Force: A push or pull exerted on an object.
3 2. Changing motion Net force a. Please Define Net Force: Sum of all the forces that are acting on an object.
4 4. Unbalanced forcesa. Please Define Unbalanced Force: An unbalance force is one that is not opposed by an equal and opposite force operating directly against the force and causes the object to change its motion.
5 5. Balanced forcesa. Please Define Balanced forces: Forces are balanced when the forces pushing (or pulling) an object in one direction are the same size as the forces acting in the opposite direction.
6 B. FrictionPlease Define Friction: Force that opposes the sliding motion between two touchingsurfaces.
20 C. Newton’s Second Law of Motion Force and accelerationMass and accelerationRelating force, mass, and accelerationa. Please Define Newton’s second law of motion: That the acceleration of an objectis in the same direction as the net force onthe object, and that the acceleration equals the net force exerted on it divided by its mass.
21 c. Calculating net force (1.) Please write net force as an Equation: Fnet = mass x acceleration
22 D. Newton’s Third Law of Motion Please Define Newton’s Third Law of Motion:That when one object exerts a force on a second object, the second object exerts a force on the first object that is equal in strength and in the opposite direction.Or for every action there is an equal and opposite reaction.
23 Forces on different objects do not cancel Forces are interactions
24 III. USING NEWTON’S LAWS -3.3 What happens in a crash?a. Safety beltsb. Air bags
35 IV. CHAPTER 3 REVIEWPlease do Check Concepts 34-42, found on page 98 in your Text.Please do Standardized Test Practice 1-8, found on page 100 in your Text.I will give you a Pre-Test on Chapter 3 problems for your Chapter 3 Test.