Physics Chapter 4: 8 Force, Friction, and Inclined Planes

Homework

Reading Preparation
Key Equations
WebLecture
Study Activity
Chat Preparation Activities
Chapter Quiz
Lab Work

Reading Preparation

Text Reading: Giancoli, Physics - Principles with Applications, 4: 8

Study Points

Section 8: There are two types of friction: that which resists motion starting in an unmoving object is static friction and that that which resists the motion of a moving object is kinetic friction. Problems involving friction and inclines can be resolved with careful application of free-body diagrams to analyze and identify all forces.

Key Equations

\begin{array}{l} Kinetic Friction F_{fr} = μ_{k} F_{N} \\ Static Friction F_{fr} \leq μ_{s} F_{N} \end{array}

Web Lecture

Read the following weblecture before chat: Friction on a flat surface

Study Activity

Take a look at Friction on a Ramp to get a sense of what is happening when we have a block on a incline with friction present.

Identify the graph lines with the force vectors (colors match). Note that the slope turns red when there is not enough static friction to keep the block at rest, where the magnitude of gravitational pull along the block equals the friction due to the normal force and coefficient of friction μ.
What is the smallest angle where the block slides if μ is 0.1? if it is 0.5? if it is 1.0?
Will the block slide if the angle is at extremes, 0° or 90°, with any value of μ

Physics at Boston University

Chat Preparation Activities

Forum question: The Moodle forum for the session will assign a specific study question for you to prepare for chat. You need to read this question and post your answer before chat starts for this session.
Mastery Exercise: The Moodle Mastery exercise for the chapter will contain sections related to our chat topic. Try to complete these before the chat starts, so that you can ask questions.

Chapter Quiz

Required: Complete the Mastery exercise with a passing score of 85% or better.
Go to the Moodle and take the quiz for this chat session to see how much you already know about astronomy!

Lab Work

If you want lab credit for this course, you must complete at least 18 labs; you may complete more if you are preparing for the AP exam.. One or more lab exercises are posted for each chapter as part of the homework assignment. We will be reviewing lab work at regular intervals, so do not get behind!

Lab Instructions: Inclined Planes (frictionless surface)

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Physics

Chapter 4: 8 Assignment