• Support PF! Buy your school textbooks, materials and every day products Here!

Force Diagram

  • Thread starter forty
  • Start date
  • #1
135
0
(a) Assume that the Earth is a uniform sphere with a radius r which rotates such that the speed of the ground at the equator is v which is constant.

(i) Draw a diagram showing the forces acting on a person standing on the equator.

There would be the following forces acting on the person:

Gravity (mg)
Normal (-mg)
Friction at the point of contact to the earth
Centripetal force (?)

(ii) Explain why a person in this situation must experience a net force even though their speed is constant.

Does this have to do with the centripetal force? So they need to have a net force towards the center of the earth??



Any help with these would be greatly appreciated.
 

Answers and Replies

  • #2
CompuChip
Science Advisor
Homework Helper
4,302
47
Since you are talking about force diagrams, I assume you know about vectors. In (ii) the question says that [itex]|\vec v|[/itex] is constant, but is [itex]\vec v[/itex] constant as well?
 
  • #3
135
0
so the magnitude of v is constant but the direction is changing hence you are accelerating and if you are accelerating your are experiencing a net force?
 
  • #4
Doc Al
Mentor
44,882
1,129
so the magnitude of v is constant but the direction is changing hence you are accelerating and if you are accelerating your are experiencing a net force?
Absolutely. So redo your analysis of the forces acting on the person.
 

Related Threads for: Force Diagram

  • Last Post
Replies
2
Views
839
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
2
Views
6K
  • Last Post
Replies
4
Views
2K
  • Last Post
Replies
2
Views
735
Replies
6
Views
10K
  • Last Post
Replies
3
Views
1K
Top