AP Physics Monday 14.12.01 Standards: Warm Up Assuming Friction is negligible, what is the Force F? F 2N 3kg 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.11-12.9 Synthesize information from a range of sources into coherent understanding of a process, phenomenon, or concept,… 1kg (Remember, start with FBD. Learning Goal: SWBAT solve MC problems in preparation for their test. Agenda: Warm Up Continue Solving AP Multiple Choice Problems MC Test Tomorrow Homework MC Test Tuesday

AP Physics Tuesday 14.12.02 Standards: Warm Up Find the normal force exerted on the block by the surface if the block (with a weight of W) is being pulled with a constant speed. F 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.11-12.9 Synthesize information from a range of sources into coherent understanding of a process, phenomenon, or concept,… θ W Learning Goal: SWBAT score 3,4,or 5 on their MC exam v Agenda: Warm Up Forces MC Test Homework Work on Notebook

Warm Up What could you have had more practice on that would have improved your test performance? AP Physics Wednesday 14.12.03 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.11-12.9 Synthesize information from a range of sources into coherent understanding of a process, phenomenon, or concept,… WHST.11-12.7: research to aid in problem solving 60° Homework Correct Test Mistakes FAP#15 Learning Goal: SWBAT correct their test mistakes Agenda: Warm Up Review Test

AP Physics Thursday 14. 12. 04 I- Independent, resilient Ind AP Physics Thursday 14.12.04 I- Independent, resilient Ind. Standards: f3A! describing forces with velocity, acceleration, etc. RST.11-12.9 Synthesize information from a range of sources into coherent understanding of a process, phenomenon, or concept,… WHST.11-12.7: research to aid in problem solving Warm Up What do you know about the physics behind objects spinning in circles? Try and explain the physics behind an object spinning around a string? Learning Goal: SWBAT experimentally determine the period of a pendulum Agenda: Warm Up Review HW Period & Frequency Homework NA

AP Physics Friday 14.12.05 f3A describing forces with velocity, acceleration, etc. RST.11-12.4 Meaning of symbols, key terms, technical jargon Problem Solvers Warm Up A child attempts to measure the period of a ball on a string. The child found that it took 60 seconds to make 20 revolutions. Did the child succeed? What would be the actual period and frequency of the rotation? Learning Goal: SWBAT experimentally determine the period of a pendulum Agenda: Warm Up Stamp HW Review Lab Pendulum Lab Homework Study for Test

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. 1976 B1 a. T up, W =4000 N down, Ff=100 N down, Ff=100N down b. 5000 N c. 625 kg B2007 b1 8.75 s b. friction up the ramp, N perpendicular, mg straight down c. 63.4 ° d. 0.27 i. velocity decreases while its acceleration remains constant ii graph is flat until t alpha then linear downwards to 0.

C#1 period, Frequency, and Circles If a car speeds around a track 15 times in 20 minutes, what is the car’s frequency & period? If a cowboy swings around a rope with a frequency of 1.2 Hz for a total of 1 minute, what is the period and how many revolutions did the cowboy make? What is the area of a circle with a radius of 4.0 m? What is the circumference of a circle with a 20.0 m radius? How far around will a circle with a radius of 2.0 m be? If a car travels halfway around a circular track that has a 2000.0 m radius, how far did the car travel. If a circle with a radius of 8.2 m is jogged by a student in 6.7 seconds, what was the student’s speed? If a car makes it ¾ of the way across a track with a radius 1.0x104 m in 9 minutes before it crashes. How fast was it going when it crashed? f=0.25 Hz T=40s 0.833s, 72 revolutions 5.0x101 m2 126m 12m 6.283x104m 7.7 m/s 87.3 m/s