Demo with Data | College Physics (algebra-based) Macmillan Learning
Work on box in accelerating truck
A box sits on the horizontal bed of a truck accelerating to the left as shown. Static friction between the box and the truck keeps the box from sliding around as the truck accelerates.
Previous question is:
1) The work done on the box by the static friction force as the accelerating truck moves a distance D to the left is
a) positive.
b) zero.
c) negative.
d) dependent on the speed of the truck.
Student Log for the following question:
2) Briefly explain your choice for the above question.
1Instructors gain insight into student understanding and can use these comments as potential starting points in a lecture.
Problems ยป| Student | Answer | Anwser to previous question | Time on Prelecture |
| Stew Dent | I don't know | 1 | 00:42 |
| Adam Smith | Because the work done on the box by the static friction force is positive | 3 | 11:53 |