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Lecture 5: Work and Energy
September 9, 2025
Reading Assignment
- Read: Chapter 6 (typo correction: the second paragraph on p. 95 should begin “Here in Part 1, we'll focus on \textit{mechanical energy}, associated with \textbf{motions and configurations} of macroscopic objects such as cars, \dots”)
- Study: Figs 6.3, 6.4; Exs 6.1, 6.2, 6.4; Fig 6.15; Eq 6.14; Ex 6.6
- Ignore: “Power and Velocity” on p. 107
Objectives
- (Continuing objective) Relate concepts of classical mechanics to “everyday” situations and discuss various applications of the concepts to practical problems in various fields of science, medicine and engineering.
- From a given constant force and the straight-line motion of an object, calculate the work done on the object by that force.
- Determine the work done during one-dimensional motion from a force-vs-displacement graph, or by integration of \(F(x)\).
- Apply the work-kinetic energy theorem to a moving object subject to one or more forces.
- Understand the definition of power, and be able to relate power, work, and time.
Homework
- Wednesday's Assigned Problems:
- Monday's Hand-In Problems:
Lecture Materials
Videos of example problems
To see the problem statement, click on the link below. To play the video example, click on the underlined words "Video Demonstration" near the top of the page with the problem statement.Pre-Class Entertainment