Physics 218: Mechanics Instructor: Dr. Tatiana Erukhimova Lecture 10.

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Presentation transcript:

Physics 218: Mechanics Instructor: Dr. Tatiana Erukhimova Lecture 10

The advantage of a pulley What minimum force F is needed to lift the piano of mass M?

The Elevator Problem

WORK (Chapter 7)

2 or 3 D motion Definition of work: Kinetic energy: Work-energy theorem:

A person carries a bag of groceries of mass M with a constant velocity at the same height from the ground. Find the work done by a person on a bag.

Problem 1 p. 122 A man pushes up on a 100 kg block with a force such that it drops from 2 meters to the ground at a constant velocity. a)How much work is done by gravity? b)What is the magnitude of the force he exerts?

Have a great day! Hw: All Ch6 problems and exercises