Exploring the Role of Friction: How Does it Affect Walking and Balance?

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In summary, the conversation discusses the possibility of walking in place with no friction and the potential challenges and adaptations that would be necessary. It is acknowledged that this is possible in principle, but in reality no surface is completely frictionless. The conversation also touches on the idea of being able to jump without friction and the need for adaptation in walking style. The limitations of this scenario, such as the inability to change lateral velocity, are also addressed.
  • #1
Sundown444
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I have heard that if there were no friction between a person walking and the ground, the person would just walk in place, like a cartoon character. If this is true, then I am a bit confused, though: How would the person just walk in place and not just slip and fall if there is no friction? Someone help me out here.
 
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  • #2
How do you walk and control your position when standing up? You push your foot backwards / sideways. If there is no friction between your sole and the floor then that will have no effect. You will fall over and not get moving. (No reaction force will result if there's no friction)
 
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  • #3
sophiecentaur said:
How do you walk and control your position when standing up? You push your foot backwards / sideways. If there is no friction between your sole and the floor then that will have no effect. You will fall over and not get moving. (No reaction force will result if there's no friction)

Thought so. Thanks for the clarifying.
 
  • #4
sophiecentaur said:
If there is no friction between your sole and the floor then that will have no effect.
You can still move your feet.
Walking in place is possible in principle, but in reality no surface is completely frictionless. On such a hypothetical surface, your "walking" direction and speed are completely independent of your actual motion (doesn't have to be in place).
 
  • #5
mfb said:
You can still move your feet.
Walking in place is possible in principle, but in reality no surface is completely frictionless. On such a hypothetical surface, your "walking" direction and speed are completely independent of your actual motion (doesn't have to be in place).
Ah well, now you are introducing practicalities. Fair enough but I was answering the question as it was put, which is a good way to start. You can walk (carefully) on ice but there's no way you can accelerate fast or change direction. If someone nudges you, you will go down.
 
  • #6
mfb said:
You can still move your feet.
Walking in place is possible in principle, but in reality no surface is completely frictionless. On such a hypothetical surface, your "walking" direction and speed are completely independent of your actual motion (doesn't have to be in place).

Really? You are right about the no surface being completely frictionless. Just one more thing; would you still be able to jump without friction at any height at all?
 
  • #7
Sure. The surface is still solid, vertical forces are possible (otherwise you would fall down through the surface).
Would need some practice to avoid falling over.
 
  • #8
mfb said:
Sure. The surface is still solid, vertical forces are possible (otherwise you would fall down through the surface).
Would need some practice to avoid falling over.

Alright. Just to make sure once more, in principle, it is possible to walk in place with no friction without falling over by slipping?
 
  • #9
In principle it is possible.
You'll have to adapt the walking style a bit.
 
  • #10
mfb said:
In principle it is possible.
You'll have to adapt the walking style a bit.

Okay then. Thanks!
 
  • #11
Sundown444 said:
Alright. Just to make sure once more, in principle, it is possible to walk in place with no friction without falling over by slipping?
With one proviso: the friction can only be very low and not zero. If it is zero then how can you change your lateral velocity by contact with the ground?
 
  • #12
The point is to not change the velocity.
 
  • #13
I read the OP as wanting to be able to move and not to have to stay in one spot. In which case you would want to change velocity (and control where you're going. Though the conversation has drifted about a bit.

Staying in one spot when there is no friction AND staying upright, would be possible by whirling your arms about appropriately, I suppose. (Is this just an arm waving explanation? :wink: )
 
  • #14
sophiecentaur said:
I read the OP as wanting to be able to move and not to have to stay in one spot.
The OP specifically asks about "just walk in place".
 
  • #15
You can still accelerate even without friction, of course. Waving your arms in the right way is an option, blowing air in one direction works, ...
This does not work in a frictionless vacuum, but then you have more urgent problems.
 

1. What is friction?

Friction is a force that resists the relative motion or tendency of motion between two surfaces in contact.

2. What causes friction?

Friction is caused by the irregularities and roughness of the surfaces in contact, which create resistance to motion.

3. How does friction affect motion?

Friction can either slow down or prevent motion altogether by creating resistance and reducing the efficiency of movement.

4. What are the different types of friction?

The three main types of friction are static friction, which occurs when two surfaces are not moving relative to each other, kinetic friction, which occurs when two surfaces are sliding against each other, and fluid friction, which occurs in liquids and gases.

5. How can friction be reduced?

Friction can be reduced by using lubricants, such as oil or grease, to create a smooth surface between two objects in contact. Additionally, polishing or smoothing the surfaces can also reduce friction.

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