Find Frictional force on a block

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SUMMARY

The discussion centers on calculating the frictional force acting on a 9 kg block resting on a 30° inclined plane with a static coefficient of friction of 0.7. The correct frictional force is determined using the equation Ff = μ * Fn, where Fn is the normal force. The participants confirm that the frictional force is not 53.4684 N, and the correct answer is calculated to be 9.36841 N based on the provided parameters.

PREREQUISITES
  • Understanding of Newton's second law (F=ma)
  • Knowledge of static friction and its coefficient (μ)
  • Ability to calculate normal force (Fn) on an inclined plane
  • Familiarity with free body diagrams for analyzing forces
NEXT STEPS
  • Learn how to calculate normal force on an inclined plane
  • Study the principles of static and kinetic friction
  • Explore free body diagram techniques for complex systems
  • Investigate the effects of varying angles on frictional force
USEFUL FOR

Students studying physics, particularly those focusing on mechanics and forces, as well as educators looking for examples of frictional force calculations in inclined planes.

trivk96
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Homework Statement



A block of mass 9 kg rests on a plane inclined
at an angle of 30◦
. The static coefficient of
friction between the block and the plane is
0.7.
What is the frictional force on the block?
1. 9.36841 N
2. 76.3834 N
3. 53.4684 N
4. 44.1 N
5. 30.87

It is not # 3. I know that for sure.

Homework Equations



F=ma
Ff=μ*Fn

The Attempt at a Solution


I have no idea
 
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Have you tried drawing a free body diagram?
 

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