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TuringTest

  • 2 years ago

@shayanreloaded bike physics

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  1. TuringTest
    • 2 years ago
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    |dw:1344703864992:dw|the back tire pushes trying to move clockwise, and static friction's reactive force pushes to the right the wheel in the from is being pushed by a force of friction to the left (due to the relative motion of the ground, as you said) which also causes the tire to move clockwise I misspoke to say that static the friction has no direction in this case, that's why I needed to draw it

  2. TuringTest
    • 2 years ago
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    wheel in the front*

  3. shayanreloaded
    • 2 years ago
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    so will the back tire continue to rotate clockwise even when friction pushes it to the right/forward??

  4. TuringTest
    • 2 years ago
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    we force the tire to move clockwise by turning the pedals. the force acting to the left is the reactive force of friction of the ground on the tire hence the friction on the back tire is a result of us *forcing* the tire to move clockwise, so yes the wheel will move that way

  5. TuringTest
    • 2 years ago
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    at the bottom of the tire we have a balance of forces|dw:1344704471674:dw|this is the force that the tire exerts on the ground due to our pedaling (human power) since there is not slippage of the back wheel this force must be balanced by friction\[\vec F=-\vec f\]hence friction points forward, which causes the bike to move forward

  6. TuringTest
    • 2 years ago
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    |dw:1344704602174:dw|

  7. shayanreloaded
    • 2 years ago
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    ok thanks can u explain the friction and motion of a car also plz

  8. TuringTest
    • 2 years ago
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    it is identical, but with double tires and a motor instead of a human to power it

  9. shayanreloaded
    • 2 years ago
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    forward force on backward tires and vice versa??

  10. TuringTest
    • 2 years ago
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    in terms of friction yes unless it is four-wheel drive, then the force of friction acts forwards for all tires

  11. TuringTest
    • 2 years ago
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    ...because there is a motor pushing the front tires as well in 4-wheel drive make sense?

  12. shayanreloaded
    • 2 years ago
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    yeah i think so.... so all tires are pushed forward. what happens while braking??

  13. TuringTest
    • 2 years ago
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    the car slows down so what direction must friction be acting?

  14. TuringTest
    • 2 years ago
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    careful in your wording of the situation btw in a 4-wheel drive the four tires are pushing against the ground *opposite* the direction of the car's motion (backwards) however friction pushes opposite that, hence the car moves forward

  15. TuringTest
    • 2 years ago
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    |dw:1344705424977:dw|

  16. TuringTest
    • 2 years ago
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    ...force of motor against the ground I mean

  17. shayanreloaded
    • 2 years ago
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    do all tires experience backward frictional force while braking? and while moving and breaking is the friction static or kinetic?

  18. TuringTest
    • 2 years ago
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    I already explained that while moving the friction is static (that is why the forces sum to zero and friction acts forward) while breaking the car is skidding (slipping) and slowing down. any wheels that lock due to the breaks will be skidding against the ground is that static or kinetic? is it into or opposite the direction of motion?

  19. shayanreloaded
    • 2 years ago
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    ok so its kinetic while braking and opp to motion right?

  20. TuringTest
    • 2 years ago
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    right :)

  21. shayanreloaded
    • 2 years ago
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    thanks a lot :)

  22. TuringTest
    • 2 years ago
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    welcome!

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