1. Monday, November 18, 2013 Physics
Warm Up
A ball travels 50 meters to the west in 20 seconds. Find the speed of the ball. Find the velocity of the ball.
Standards: Students know Newton’s 2nd Law
Objective: SWBAT draw free body diagrams
Homework
P.3 #F6
P.5,6 Finish Graphing & Problem Solving Worksheets and turn in tomorrow.
Agenda
Warm Up
P.3 Turn in Graphing & Problem Solving Worksheets
Force Stations Lab
P.5,6 Test

2. Tuesday, November 19, 2013 Physics
Warm Up
Find the acceleration of a car that speeds up from rest to 10 m/s in 5s?
Standards: 1c Newton’s 2nd Law of Motion
Objective: SWBAT create free body diagrams of various physical situations.
Homework
#F6 P.4
Agenda
Warm Up
P.2 Take Test
P.4 Free Body Diagram Mini-Lecture
Force Stations: Elaborate Section

3. Wednesday, November 20, 2013 Physics
Warm Up
A cart rolls across a table with an applied Force of 10N, a frictional force of 5N, no air resistance, and a mass of 2kg. It’s acceleration is unknown. draw a free body diagram for this situation.
Standards: 1.c newton’s 2nd law.
Learning Objective: SWBAT create free body diagrams
Agenda:
Warm Up
Continue working on Force Stations Lab
Practice Free body diagrams
Homework
#F6

4. Thursday, November 21, 2013 Physics
Warm Up
Draw a Free Body Diagram for a car skidding to a stop.
Standards: : 1c Newton’s 2nd Law of Motion
Learning Objective: SWBAT solve problems using Free Body Diagrams
Homework
#F7
Finish Force Stations lab
FBD Quiz 6 Friday
Agenda:
Warm Up
P.6,P.7Finish Force Stations Lab
P.3 FBD Problem Solving: Guided Practice
P.3 Solving Free Body Diagram Problems.

5. Friday, November 22, 2013 Physics
Warm Up
Create a free body diagram of a car driving down a hill where friction & air resistance will affect the car’s motion.
Standards: 1c Newton’s 2nd Law of Motion
Learning Objective: SWBAT solve problems using free body diagrams.
Agenda:
Warm Up
Review HW & Collect Labs
Quiz
FBD practice.
Homework
#F7&8 p.6,7

6. Symbols, units and equations Study Guidev
m/s a
m/s2 F
kgm/s2 or N Δx m
Constant Velocity
Constant Acceleration
Forces
The Two equations of Motion
The Two equations of Motion for Falling Objects 1.
ag=-9.8m/s2 2.

7. Modeling the Graphing Process
Step One – label each axis with the symbol and the units being represented by the graph. 1st column x-axis, 2nd column y axis Step Two – Create your x and y axis scales. To create a scale(your numbering system on the graph) look at your smallest and largest data points. Then pick a number sequence (ex. 1,2,3,4 or 2,4,6,8) that will allow all of the points to fit on your graph. Step Three – Plot the Points. Step Four – Make a best fine line. It has to be straight and you need to make it go through the center or through the average of your points. See board for more explanation. Step Five – Find the slope of the graph. Step Six (Honors Only) – Find the equation of the graph by substituting your data into the formula y=mx+b

8. Physics Problem Solving Process
Step 1: Read the problem twice. Answer: Is the object in the problem traveling at some average or constant speed or is the speed changing or accelerating Step 2: Look at the group of equations that applies to your situation: Constant Velocity or Acceleration. Then begin to write down the givens and pick their symbols based on the symbols you find in the equations. Step 3: Draw a diagram using the conventions we’ve learned. Be sure to represent all of the givens in your diagram. Step 4: Next pick your equation. The equation should only have one symbol that you don’t know. If it has more than one either pick a different equation with only one, or you may need to think about using another equation in addition. Step 5: Use the equation/s that you’ve picked, plug in the givens (don’t forget to include units) and solve for your unknown.
Physics Problem Solving Process
Step 1: Read the problem twice. Answer: Is the object in the problem traveling at some average or constant speed or is the speed changing or accelerating
Step 2: Look at the group of equations that applies to your situation: Constant Velocity or Acceleration. Then begin to write down the givens and pick their symbols based on the symbols you find in the equations.
Step 3: Draw a diagram using the conventions we’ve learned. Be sure to represent all of the givens in your diagram.
Step 4: Next pick your equation. The equation should only have one symbol that you don’t know. If it has more than one either pick a different equation with only one, or you may need to think about using another equation in addition.
Step 5: Use the equation/s that you’ve picked, plug in the givens (don’t forget to include units) and solve for your unknown.

9. HW: #F6
*** Extra Credit:
After you create each free body diagram, use your free body diagram to make an Fnet=ma equation in the x direction and in the y direction like we did during the Explain portion of the lesson. Ex ` FN Fg
FAP FF
FAR
Fnetx=Fap-Ff-FAR=macar-x-direction
Fnety=FN-Fg=macar y-direction

10. Force Stations
For the full 10 pts of credit requires full completion of explore, explain, elaborate, and evaluate sections. Evaluate is Homework worth 10 points.
Objective: Gain an introduction to free-body diagrams (FBDs), and create accurate FBDs of physical systems at stations around room.
Engage
Watch discovery channel video clip on the physics of skydiving (~3 min.): .
Explore
Students rotate around force stations in the room and explore each system ~16 min
Identify the Labeled Station
Explore each station: 2 minutes, identify all the forces acting on the object, and draw all the forces on the object.
1. Object at rest on table
2. Cart rolling across table
3. Object hanging by string
4. Object hanging by two strings at an angle to each other
5. Ball rolling down ramp
6. Object stationary on ramp
7. Ball falling through air
8. Coffee filters falling through air
Explain
Mini-lecture on FBDs (Free Body Diagrams) ~5 min
Students revise any force station FBD that is incorrect.
Students finish guided practice problem.
Elaborate
Using magazines provided in class, cut out a picture that shows an interesting physical scenario. Then students create FBD for one or multiple objects in the cutout picture.
Evaluate
“Free-Body Exercises: Linear Motion” #F6

11. Free Body Diagrams
What are they? – These are diagrams similar to the one’s we are used to drawing, but with one major exception. You only put Forces on them. ` FN Fg
FAP FF
FAR
Why do we make them?
They help us solve problems involving multiple forces.
Looking at the diagram to the right. Fnetx=Fap-Ff-FAR
Fnety=FN-Fg
Question: If the car has a 2000 kg mass, its applied force is 10,000 N, friction is 1500 N, and Air Resistance is 1000 N, find the car’s acceleration and the *Normal Force acting on the car?
When do we make them?
Remember Fnet=ma? You create a free body diagram to help you find the Fnet portion of this equation.
Fnetx=Fap-Ff-FAR=macar-x-direction
Fnety=FN-Fg=macar y-direction

12. Free Body Diagrams #F7
For each problem:
Draw a Free Body Diagram of the problem.
Make an equation for Net Force in the x (horizontal) and y (vertical) directions.
Then plug in the numbers and Calculate the net force in the x direction and then the y direction.
Extra Credit: Find ax and ay
A man pushes a 5kg box with 15 N force to the right while it encounters a 10 N friction force.
An 1kg egg is free-falling from a nest in a tree. Neglect air resistance.
A 2kg flying squirrel is gliding (no flapping wings) from a tree to the ground constant velocity.
A rightward force of 10 N is applied to a 1kg book in order to move it across a desk. Consider a frictional force of 4 N.
A 50kg gymnast is suspended motionless from the ceiling by a bar and two vertical ropes, each with a 25 N force.

13. Problem Solving using FBD’s #F8
If a car’s engine accelerates the car using 50,000 N of Force. Friction is resisting the motion with 12,000 N. Find the acceleration of the 2000kg car?
If a 60kg skydiver is freefalling towards the ground, and the air resistance half way to the ground is 500 N. What is the net force on the skydiver?
From Problem 2, what is the acceleration of the skydiver?
If a 70 kg skydiver is freefalling at terminal velocity, what is the air resistance that the free faller is experiencing.
If a 1200 kg car’s engine applies 50,000 N to accelerate the car and it achieves a 2.5m/s2 acceleration, how much friction is acting on the car? (Assume air resistance is negligible.)
If a 20 kg slab of wood is being accelerated on ice at 1.25 m/s2 and friction is small at 5 N. What is the applied force on the slab of wood?