Friction & Gravity: Relations & Independence

In summary, friction is independent of velocity and surface area, but it is proportional to the normal reaction force. This means that the maximum friction force depends on gravity, which is represented by the normal force. This relationship is important to consider when solving high school physics problems involving friction. Additionally, in situations where there is no gravity, such as in space, astronauts must use additional measures, such as springs or elastic, to create a normal force and generate friction.
  • #1
nil1996
301
7
What is the relation between friction and gravity?Is friction independent of gravity?
 
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  • #2
Would you please make the statement more clear? If the question is involving high school physics problems, I would say that [itex]\text{friction is proportional to pressure not gravity, given a certain coefficient of friction} \; \mu.[/itex]
 
  • #3
Friction is pretty complicated. Several assumptions are usually made to try and simplify it. For example..

Friction is independent of velocity
Friction is independent of surface area
Friction is proportional to the normal reaction force (eg weight)

The normal force is the mass * acceleration due to gravity so in short yes, the max friction force depends on gravity.

EDIT: Astronauts using a treadmill in space have to be pulled down onto it using springs/elastic.
 
Last edited:
  • #5
thanks

thanks for all your replies.You are helping me a lot.
 

1. What is the difference between friction and gravity?

Friction is the force that opposes motion between two surfaces in contact, while gravity is the force of attraction between two objects with mass.

2. How does friction affect an object's motion?

Friction can slow down or stop an object's motion, as it acts in the opposite direction of the object's motion.

3. What factors affect the amount of friction between two surfaces?

The amount of friction between two surfaces depends on the types of surfaces, the force pressing the surfaces together, and the roughness of the surfaces.

4. Is friction always a disadvantage?

No, friction can be both advantageous and disadvantageous. For example, friction allows us to walk and drive, but it also causes wear and tear on surfaces and objects.

5. How is gravity related to friction?

Gravity plays a role in the amount of friction between two surfaces, as it affects the force pressing the surfaces together. The stronger the force of gravity, the greater the friction between two surfaces.

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