Mr. Rogers' AP Physics C: Mechanics (With IB Physics Topics) Objectives

Syllabus 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter
Newton's Laws (4)
Friction (5) Mech Energy (7) Momentum Semester Exam

Chapter 5 (Continued): The Laws of Motion

AP Physics C Newtonian Mechanics: B. Newton's laws of motion approx 2%, cumulative 30%
    1.Static equilibrium (first law) 
    2.Dynamics of a single particle (second law) 
    3.Systems of two or more bodies (third law) 

 

Practice Test Study Guide

Objectives

Essential Question: Can you push an object with a rope?

Cable Problems

  1. State the nature of idealized massless ropes used with friction free massless pulleys.
  • can pull but not push
  • tension is = to the force acting on one end.
  • zero net force is required to accelerate the rope, hence, the net force acting on the rope is always zero.
  • the rope essentially transmits a force from one location to another
  1. Draw freebody diagrams of accelerating objects attached with ropes.
  2. Solve various cable problems.
  3. Derive the equation for finding g (the strength of the gravity field) using an Atwood machine.

  4. By studying the equation decide the best strategy for setting up the Atwood machine for the most accurate results.

 

Homefun Complete the Atwood machine lab

 

 

 

Essential Question: How can I make an "A" on the test?

Newton's Laws Review

  1. Work the practice test.
  2. Review the objectives.
  3. Correctly draw FBDs.
  4. Review the study guide

Summative Assessment: Unit Exam objectives 1- 25

 

Activities

Lesson 4

Key Concept: Atwood machine.

Purpose: Measure the gravity field constant g

Derivation: Atwood machine

In Class Problem Solving:  

  1. Atwood machine
  2. Pulley on an icy slope
  3. Jackie and Samo on a slope

Formal Lab: see below

Formal Lab Investigation

Title Estimating g using an Atwood machine
Category Newton's Laws
Purpose Determine if the gravity constant really is 9.8 m/s/s.
Models Atwood equation: g = a(m1 + m2)/(m1 - m2)

Kinematic equation: a = 2D/t2

Overview After attaching a pulley to a fixed point, we hook masses to the string over the pulley. We then lower one of the masses until it touches the floor. We finally release the lower mass and time the descent of the higher mass, measuring this time and, through our equations, determining the gravitational constant.
Safety Issues Be careful to regulate the descent of the higher mass so that it will occur slowly and not crash to the floor.
Equipment Limitations Possible equipment limitations include friction between the pulley and the string, which will slow the rate of descent of the mass. This friction can be minimized by using a low-friction string or by greasing the pulley. Air resistance is a source of error that cannot be prevented, although its effects should not be substantial. The size of the error can be estimated by evaluating the differences between estimated values and the predicted gravitational constant.

 

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