Solving Static Friction Problems: Finding n from Velocity

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SUMMARY

The discussion centers on the relationship between static friction and normal force (n) when only velocity is provided. It is established that static friction is calculated using the formula F_static = Us * n, where Us represents the coefficient of static friction. Participants agree that without additional information, such as mass or surface angle, determining the normal force solely from velocity is not feasible. The consensus is that normal force is typically derived from the weight of the object and external forces acting on it.

PREREQUISITES
  • Understanding of static friction and its formula (F_static = Us * n)
  • Knowledge of forces acting on objects, including weight and external forces
  • Familiarity with basic physics concepts such as mass and acceleration
  • Ability to analyze problems involving inclined surfaces and angles
NEXT STEPS
  • Research the concept of normal force in different physical scenarios
  • Study the effects of inclined planes on normal force calculations
  • Explore the relationship between mass, weight, and normal force in static friction problems
  • Learn about the role of external forces in determining normal force
USEFUL FOR

Students studying physics, educators teaching mechanics, and anyone seeking to understand the principles of static friction and normal force calculations.

hellomister
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Hello,

the Force of static friction = Us*n , if i am given a Velocity then how do i find n (normal force)? There is no mass given just a velocity. I am not asking for help for a solution for homework, i am just asking for clarification.

Thank you.
 
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Welcome to PF.

Often normal forces are due simply to the weight of the object, and possibly the angle or slope of the surface.

Normal forces are also affected by forces that push an object into a surface (or pull on it, but without actually pulling it off of the surface.)

I don't know of any case where the velocity is used to find n. There would have to be some other information given to find n, or if not then perhaps n is not needed in order to solve the problem.

You may need to post a specific problem in the Homework section, if this is not clear.
 

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