Quick friction concept question

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The discussion focuses on how the angle of a pulling force affects friction when moving a box across a rough surface. It is established that pulling the box above horizontal results in the least friction due to a reduced normal force, while pulling below horizontal increases the normal force and thus increases friction. The relationship between the angle of the force and the normal force is key to understanding this concept. The explanation emphasizes resolving forces into horizontal and vertical components to clarify the impact on friction. Overall, the angle of the applied force significantly influences the friction experienced by the box.
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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.
 
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Try imagining the forces resolved into horizontal and vertical components. Does that help?
 
2. Homework Equations ,

Force of Friction = mu*Normal ForceSo 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
 

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