Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

JazzyCaz Group Title

2. A 2.0 kg block rests on a level surface. The coefficient of static friction is µs = 0.60, and the coefficient of kinetic friction is µk = 0.40. A horizontal force, F, is applied to the block. As F is increased, the block begins moving. Describe how the force of friction varies as F increases from the moment the block is at rest to when it begins moving. Indicate how you could determine the force of friction at each value of F―before the block starts moving, at the point it starts moving, and after it is moving.

  • 3 years ago
  • 3 years ago

  • This Question is Closed
  1. EdgeOfTheEarth Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    \[\mu = \frac{{F}f}{{F}n}\] Where u is the coefficient of friction, Ff is force of friction, and Fn is the normal force. The normal force is the force perpendicular (going straight up), so in this case, it is equal to the Force of Gravity on the block. 9.8 x 2 = 19.6 N, so this is the normal force. static friction is the friction when there is no motion, and kinetic friction is the friction when there is motion (the blocking moving) \[0.60 = \frac{{F}f}{19.6}\] for static friction \[0.40 = \frac{{F}f}{19.6}\] for kinetic friction So if we solve for both friction forces, we get that the static friction force is 11.8 N, and the kinetic friction force is 7.8 N. Before the block is moving, the force of friction is less than or equal to the static friction force (11.8 N), and when the block begins moving, the friction force is 7.8 N, the kinetic friction force.

    • 3 years ago
  2. JazzyCaz Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    gracias :)

    • 3 years ago
  3. EdgeOfTheEarth Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    de nada :)

    • 3 years ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.