Standard: Analyze data to support the claim that Newton’s second law of motion describes the mathematical relationship among the net force on a macroscopic object, its mass, and its acceleration. By the end of today, IWBAT… Define force and differentiate between balanced and unbalanced forces Essential Question: What is force? Topic: Force 11/2/15- Place notes on pg. 29

Pg of Interactive Notebook

Why it matters in LIFE: You already know how to calculate an object’s motion – now we are going to learn about WHY objects move Why it matters in LIFE: You already know how to calculate an object’s motion – now we are going to learn about WHY objects move Why it matters in THIS CLASS: Our Goal = 80% Mastering today’s lesson (focused participation, asking questions, etc) is the first brick that will help us reach our goal for this unit, and eventually for the year Why it matters in THIS CLASS: Our Goal = 80% Mastering today’s lesson (focused participation, asking questions, etc) is the first brick that will help us reach our goal for this unit, and eventually for the year By the end of the day today, IWBAT… Define force and differentiate between balanced and unbalanced forces By the end of the day today, IWBAT… Define force and differentiate between balanced and unbalanced forces

What is force?  FORCE = A push or pull that changes an object’s velocity  A change in velocity = acceleration  As a result, forces can cause objects to speed up, slow down, or change direction

What are the units for force?  UNIT: Newton (N) MeasurementUnit DistanceMeters (m) TimeSeconds (s) Velocitym/s Accelerationm/s 2 ForceNewton (N)

Yes! By making it speed up! Is the pitcher exerting a force on the baseball?

Yes! By making it stop! Is the outfielder exerting a force on the baseball?

Yes! By changing its direction! Is the batter exerting a force on the baseball?

What is Net Force?  Usually more than one force is acting on an object  NET FORCE = the overall force acting on an object

What are Balanced Forces?  Forces are balanced when the net force = 0  When two or more equal forces act on an object in opposite directions  Generally, NO ACCELERATION occurs

What are Unbalanced Forces?  Forces are unbalanced when net force ≠ 0  When unequal forces act on an object. One force is greater than another  Object Accelerates

BrainPop Video- FORCE BrainPop Username- katyisd Password- katyisd

Summary Questions 1. What is net force? 2. What is true about net force when all the forces acting on an object are balanced? 3. What is true about net force when all the forces acting on an object are unbalanced?

Exit Ticket Hand them to me on your way out Answer: _____ Defend your answer: _________________________________________________________________________________

Standard: Analyze data to support the claim that Newton’s second law of motion describes the mathematical relationship among the net force on a macroscopic object, its mass, and its acceleration. By the end of today, IWBAT… identify the types of forces acting on an object Essential Question: What are the major types of forces? Topic: Force Place Notes on Pg. 31

Announcement  DO NOW: 5-minutes to complete foldables on pg. 28.

Examples of Forces 1.Applied 2.Friction 3.Gravity 4.Normal Force

Applied Force  The force one applies to push an object in a particular direction.

Friction Force  Friction is a force that opposes motion between two surfaces that are in contact.  The roughness of two objects rubs together, which slows the object down – slowing down = deceleration, which means friction must be a force!

Gravitational Force  Gravity is the force that attracts a body toward the center of the earth, or toward any other physical body having mass  If gravity causes objects to accelerate at a rate of m/s2, then it must be a force!

Normal force (Support Force)  Normal Force (Support Force) = The upward force that balances the weight of an object on a surface.  Doesn’t cause an object to accelerate.

LAB: Let’s Measure Force!! 1. Read through the Background information for the lab. (2 mins) 2. We will read through the procedure as a class.