Give an example of a situation in which there is a force and a displacement, but the force does no work. Explain why it does no work.
Work is said to be done by a force on an object when the force acts on the object and displaces it from its position. When a force acts on an object and displaces it by a distance , then the work done is expressed as , where is the angle between the force and the displacement.
Step 1 of 2
Suppose you lift a bag of books and start walking on a horizontal floor. Now analyze the directions of the force and the displacement. Let us have a look at the following figure to understand the situation.
From the figure above, you have applied a force on the bag in the upward direction. You are walking along the floor as shown above. So, the force and displacement are mutually perpendicular. So, the angle between them is .
According to , when
Hence the work done by you on the bag is zero.
Textbook: College Physics
Author: Paul Peter Urone, Roger Hinrichs
This textbook survival guide was created for the textbook: College Physics , edition: 1. The answer to “Give an example of a situation in which there is a force and a displacement, but the force does no work. Explain why it does no work.” is broken down into a number of easy to follow steps, and 27 words. This full solution covers the following key subjects: work, Force, explain, Example, give. This expansive textbook survival guide covers 34 chapters, and 3125 solutions. The full step-by-step solution to problem: 2CQ from chapter: 7 was answered by , our top Physics solution expert on 07/07/17, 04:39PM. College Physics was written by and is associated to the ISBN: 9781938168000. Since the solution to 2CQ from 7 chapter was answered, more than 2195 students have viewed the full step-by-step answer.