Answer to Question #160233 in Physics for Ines

Question

Problem No2: /6 marks

1. A man cleaning a frictionless floor pulls a vacuum cleaner with a force F of magnitude 

50 N at an angle of 30° with the horizontal.

a) Draw a labelled free body diagram showing all the forces that act on the vacuum 

cleaner.

b) What is the magnitude of the work done by the weight of the vacuum cleaner? 

Answer 1

(a) Let's draw a FBD:

(b) Since the weight acts perpendicular to the displacement of the vacuum cleaner the work done by the weight of the vacuum cleaner equals zero.