Quick friction concept question

  • Thread starter jcpwn2004
  • Start date
  • #1
49
0

Homework Statement



A box is pulled across a rough horizontal surface with force F. Each time the box moves a distance D, howeveer the angle of F varies. Which angle causes the most/least amount of friction. An angle above/below/horizontal to the surface.



Homework Equations





The Attempt at a Solution



I know that the least friction is caused by a force above horizontal and the most is caused by a force below horizontal but I have no clue how to explain it using physics.
 

Answers and Replies

  • #2
218
0
Try imagining the forces resolved into horizontal and vertical components. Does that help?
 
  • #3
16
0
2. Homework Equations ,

Force of Friction = mu*Normal Force


So if u are pulling bellow the horiziontal, u are pusing the box into the ground, thus increasing the normal force => increasing friction.

If you pull above horizontal, then u are pulling up the box => less Normal force => less friction

make sense?

question ? ask me

ZPOWER
 

Related Threads on Quick friction concept question

  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
13
Views
2K
Replies
4
Views
2K
  • Last Post
Replies
4
Views
2K
Replies
6
Views
6K
  • Last Post
Replies
1
Views
3K
Replies
5
Views
9K
  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
2
Views
5K
  • Last Post
Replies
8
Views
2K
Top