1. AP Physics Monday 14.11.17 Standards: Kinematics 1D & 2D: Big Idea 3
Warm Up
Draw both free body diagrams, find T and find a
Fnetx=T=ma
Fnety=Mg-T=Ma
Standards: 3a3 A force exerted on an object is always due to the interaction of that object with another object
I –Independent Resilient Individuals RST Synthesize information from a range of sources into coherent understanding of a process, phenomenon, or concept,…
m=6 kg
M=2kg
Learning Goal: SWBAT solve problems involving pulleys
Agenda:
Warm Up
Finish Pulley Lab
Homework
Finish HW 10 & 11

2. AP Physics Tuesday 14.11.18 Standards: Kinematics 1D & 2D: Big Idea 3
Warm Up
Draw FBD’s. Which expression goes with which mass? Find T & a.
1. Fnety=T-Mg=ma
Standards: 3a3 A force exerted on an object is always due to the interaction of that object with another object
I –Independent Resilient Individuals RST Synthesize information from a range of sources into coherent understanding of a process, phenomenon, or concept,…
M=6kg
m=2kg
2. Fnety=mg-T=Ma
Learning Goal: SWBAT set up a pulley system and measure the net acceleration of the masses.
Agenda:
Warm Up
Finish Classwork 18
Begin FAP#12
Homework
FAP #12 Worksheet
Quiz Friday

3. Warm Up .
AP Physics Wednesday Standards: 3a3 A force exerted on an object is always due to the interaction of that object with another object I –Independent Resilient Individuals RST Synthesize information from a range of sources into coherent understanding of a process, phenomenon, or concept,…
M=4kg
m=3kg
60°
Learning Goal: SWBAT draw free body diagrams and write out expressions for many different scenarios
Homework
FAP#13 Worksheet
Agenda:
Warm Up
Free Body Diagram Recap/Activity

4. AP Physics Thursday 14. 11. 20 I- Independent, resilient Ind
AP Physics Thursday I- Independent, resilient Ind. Standards: 3a3 A force exerted on an object is always due to the interaction of that object with another object RST Synthesize information from a range of sources into coherent understanding of a process, phenomenon, or concept,… WHST : research to aid in problem solving
Warm Up
Draw a FBD and write expressions for each object in the system
Learning Goal: SWBAT review forces in preparation for multiple choice exam m1 μk θ
Agenda:
Warm Up
Review HW
Test Review Practice m2
Homework
FRQ quiz Friday
Turn in up to FAP #14

5. AP Physics Friday Standards: 3a3 A force exerted on an object is always due to the interaction of that object with another object
RST Meaning of symbols, key terms, technical jargon Problem Solvers
Warm Up
What part of working with forces are you least comfortable with? Why and what might you need to help you prepare for your test?
Learning Goal: SWBAT obtain a perfect score on your quiz.
Agenda
Warm Up
Take Quiz
Continue Reviewing
Homework
FAP #14 FRQ’s

6. Newton’s 3rd Law Activity 17
Newton’s 3rd Law Means what? - Research in Book and online, write down a definition in your own words.
What does that definition mean? Create 2 scenarios or situations where forces are acting. Draw each scenario and label their action/reaction pairs.
Example A box on a table.
Find all of the action/reaction pairs at each station. N W
Mass hanging from strings.
Ball accelerating down a ramp.
Car decelerating due to friction
Pith Ball Suspended in air between ruler and Van de Graff
plastic cap floating on water

7. Newton’s 3rd Law Pulley’s 18
There are two main types of pulley setups you will need to be familiar with for the AP Test. 1. Mass & Pulley 2. Atwoods Machine m M m M
Directions: Build each pulley system.
Set up 10g mass and a blue cart
Calculate the acceleration of the cart. (Hint use 2 FBD’s & create expressions for each)
Collect distance & time measurements to find the acceleration of the block & mass.
Find % error.
Set up a 40 g & 50 g mass on each side of Atwood’s machine.
Calculate the acceleration of the cart.
Measure the change in height over time in order to find the acceleration of the masses.
Find % error.

8. Types of Forces Force Symbol Definition Direction Friction f or Ff
Resistive Force. Comes from rubbing against or sliding across surfaces.
Parallel to the surface and opposite the direction of sliding
Normal
N or FN
The force exerted on an object by the ground, a table, a platform, or any surface.
Perpendicular to and away from the surface.
Spring
Fsp
Restoring Force. The push or pull a spring exerts on an object.
Opposite the displacements of the object at the end of the spring.
Tension
T or FT
The pull exerted by a string, rope, or cable when attached to something.
Away from the object and parallel to the string, rope, or cable at the pont of attachment.
Thrust
Fthrust
A general term for the forces that move objects such as rockets, planes, cars and people.
In the same direction as the acceleration of the object.
Weight
W or Fg
Attractive Force of two objects due to gravity. Usually Earth and and object
Straight down towards the center of the earth.
Air Resistance/Drag
FAR
Resistive Force, comes from air/wind hitting moving objects
Opposite of Motion
Electric FE
Force between atoms with electric charge (protons & electrons)
Like charges repel +
Opposite charges attract -
Magnetic FB
Force between magnetic poles & force created when electric current is in flux.
Same Pole repels
Opposite Pole Attracts
Applied Force
FAP
A Force applied by a person, thing, or individual that does not fall into any of the above categories
any

9. Fap#10
Identify the equal and opposite force for each of the following situations.
Draw Free Body Diagrams of each. Pulleys require 2 free body diagrams, one for each mass.
Write the Net Force Expressions for Each FBD. m M m M
for m W & N, T & Fblock , possibly block & frition also for M W & T
see board

10. HW: FAP#7
After you create each free body diagram, use your free body diagram to make an Fnet=ma expression in the x direction and in the y direction. Ex ` FN Fg
FAP FF
FAR
Fnetx=Fap-Ff-FAR=macar-x-direction
Fnety=FN-Fg=macar y-direction

11. F#11 Pulley’s & Newton’s 3rd Law
For 1 & 2. Find M if a=-2 m/s2 and a=2m/s2 For 3 & 4. Find M if a is downward at 4m/s2 and 2m/s2 as the arrow shows
no Friction
μ=0.1
4 kg M 2. M
8kg 1. a a
no Friction
no Friction
4kg M M
2kg 4. 3. a a

12. #19 Free Body Diagram/Expression Station
on sheets

13. FAP #14
1976B1. The two guide rails for the elevator shown above each exert a constant friction force of 100 newtons on the elevator car when the elevator car is moving upward with an acceleration of 2 meters per second squared. The pulley has negligible friction and mass. Assume g = 10 m/s2.
a. On the diagram below, draw and label all forces acting on the elevator car. Identify the source of each force.
b. Calculate the tension in the cable lifting the 400-kilogram elevator car during an upward acceleration of 2 m/sec2. (Assume g 10 m/sec2)
c. Calculate the mass M the counterweight must have to raise the elevator car with an acceleration of 2 m/sec2
B2007b1 (modified) A child pulls a 15 kg sled containing a 5.0 kg
dog along a straight path on a horizontal surface. He exerts a
force of 55 N on the sled at an angle of 20° above the horizontal, as shown in the figure. The coefficient of friction between the sled and the surface is 0.22.
a. On the dot below that represents the sled-dog system, draw and
label a free-body diagram for the system as it is pulled along the
surface.
b. Calculate the normal force of the surface on the system.
c. Calculate the acceleration of the system.
d. At some later time, the dog rolls off the side of the sled. The child continues to pull with the same force. On the axes below, sketch a graph of speed v versus time t for the sled. Include both the sled's travel with and without the dog on the sled. Clearly indicate with the symbol tr the time at which the dog rolls off.

14. A 10-kilogram block rests initially on a table as shown in cases I and II above. The coefficient of sliding friction between the block and the table is 0.2. The block is connected to a cord of negligible mass, which hangs over a massless frictionless pulley. In case I a force of 50 newtons is applied to the cord. In case II an object of mass 5 kilograms is hung on the bottom of the cord. Use g = 10 meters per second squared. a. Calculate the acceleration of the 10-kilogram block in case I. b. On the diagrams below, draw and label all the forces acting on each block in case II c. Calculate the acceleration of the 10-kilogram block in case II.
10kg
5kg