Why is the Normal Force Neglected in Certain Scenarios?

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SUMMARY

The normal force is often neglected in scenarios involving wheels transitioning off the ground, such as when a wheel ascends to the next step. In these cases, if the force exerted on the wheel exceeds the gravitational force (mg), the wheel will lift off the ground, resulting in the absence of a normal force. This principle is crucial in understanding the dynamics of rolling objects and their interactions with surfaces.

PREREQUISITES
  • Understanding of Newton's laws of motion
  • Basic concepts of forces and free-body diagrams
  • Knowledge of gravitational force (mg) and its implications
  • Familiarity with the mechanics of rolling motion
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  • Study the principles of rolling motion and its equations
  • Learn about free-body diagrams and how to analyze forces
  • Explore scenarios involving normal force in static and dynamic contexts
  • Investigate the effects of different surfaces on normal force and friction
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Physics students, mechanical engineers, and anyone interested in the mechanics of motion and forces, particularly in relation to wheels and rolling objects.

nomorenomore
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attachment.php?attachmentid=67312&stc=1&d=1394118481.jpg


So why does normal force of the wheel not counted or drawn in the diagram??
Isn't it that whenever there's mg, there's also Fnormal?

Thanks!
 

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It looks like it's because the problem involves the wheel going up off the ground to the next step, so if the force is large enough, then the wheel will be up off the ground and so there won't be a normal force.
 
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