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Thread: Physics

  1. #1
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    Physics

    https://thechive.com/wp-content/uplo...9-photos-3.mp4

    This is fake, someone had to give this guy a push?

    Discuss.
    "timberridge is terminally vapid" -- a fortune cookie in Yueyang

  2. #2
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    Leaf blower isn't doing shit, see Newton's 3rd law.

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    Going downhill?

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    Quote Originally Posted by The Tortoise View Post
    Going downhill?
    It looks like FL. The guy is in a mop bucket. How fast can a mop bucket go down a hill in FL?
    "timberridge is terminally vapid" -- a fortune cookie in Yueyang

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    Quote Originally Posted by Timberridge View Post
    It looks like FL. The guy is in a mop bucket. How fast can a mop bucket go down a hill in FL?
    Add a treadmill and he'd certainly take off
    Aim for the chopping block. If you aim for the wood, you will have nothing. Aim past the wood, aim through the wood.
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    Quote Originally Posted by Dantheman View Post
    Leaf blower isn't doing shit, see Newton's 3rd law.
    Not exactly. The bulk of the energy being applied is indeed cancelled out by being opposed within itself. But the leafblower is exerting a force into the umbrella, and some of which is very inefficiently redirected backwards (mostly sideways really, but let's grant that it's possible that there's a small net reverse force vector) by the umbrella. Of course, a leafblower is a weak stand-in for a jet engine, and the umbrella's scattering of that force applies it poorly (just pointing it backwards would have been a more effective use of this feeble "jet"). Anyway, yeah, obviously a downhill is the reason why he is maintaining enough speed to overcome road friction (oh wait, Florida; so maybe a tail wind could have helped too).

  7. #7
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    Quote Originally Posted by Dantheman View Post
    Leaf blower isn't doing shit, see Newton's 3rd law.
    You clearly haven't seen addendum IV.II.a to Newtown's laws: "Does not apply to Florida Man"

  8. #8
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    Quote Originally Posted by bobz View Post
    But the leafblower is exerting a force into the umbrella, and some of which is very inefficiently redirected backwards (mostly sideways really, but let's grant that it's possible that there's a small net reverse force vector) by the umbrella.
    My gut says: forward acceleration derived from umbrella-vectored thrust < rearward acceleration from leaf blower pointed in the wrong direction

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    If only that mop bucket was on a treadmill.

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    Quote Originally Posted by bonewrenched View Post
    You clearly haven't seen addendum IV.II.a to Newtown's laws: "Does not apply to Florida Man"
    Science!

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    Quote Originally Posted by The Tortoise View Post
    Going downhill?
    It's Florida, so, yeah?

    At least after a few more beers it will be.
    I still call it The Jake.

  12. #12
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    Quote Originally Posted by Dantheman View Post
    My gut says: forward acceleration derived from umbrella-vectored thrust < rearward acceleration from leaf blower pointed in the wrong direction
    Agreed. Think thrust-reversers on a jet engine.

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    Are you guys calling the New York Post a liar?!?!

    https://nypost.com/2020/10/16/florid...wered-vehicle/

    Longer facebook video: https://www.facebook.com/BrianEdward...17424064301461

    Enjoy.

  14. #14
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    I donít have a leaf blower. One of you guys that do should try it out and report back.


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    Quote Originally Posted by The AD View Post
    Agreed. Think thrust-reversers on a jet engine.
    I'm not sure why I even qualified that with the "my gut" part. Achieving net-forward thrust from that setup would inherently violate laws of thermodynamics and mechanical efficiency.

  16. #16
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    point the leaf blower backwards and ditch the umbrella.

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    https://youtu.be/Ypa2SKpSD1E


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  18. #18
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    In the link posted by EWG above it looks like thereís a tow line of sorts poorly edited out in some of the longer video.


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    Quote Originally Posted by MagnificentUnicorn View Post
    I don’t have a leaf blower.
    Try it with a rake?
    "timberridge is terminally vapid" -- a fortune cookie in Yueyang

  20. #20
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    Quote Originally Posted by Timberridge View Post
    Try it with a rake?
    This isnít CA


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  21. #21
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    Quote Originally Posted by Timberridge View Post
    Try it with a rake?
    Definitely need a TR on this.

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    Quote Originally Posted by Dantheman View Post
    I'm not sure why I even qualified that with the "my gut" part. Achieving net-forward thrust from that setup would inherently violate laws of thermodynamics and mechanical efficiency.
    How does it violate thermodynamics? It converts electrical energy into mechanical energy (the movement of the bucket) and heat (the leaf blower gets hotter and there's friction between the wheels and axles and wheels and the ground. when the battery runs down he stops.

    Quote Originally Posted by The Suit View Post
    point the leaf blower backwards and ditch the umbrella.
    Wouldn't work. He'd go too fast and crash.
    It also wouldn't work with an American umbrella--it would shred.

  23. #23
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    I keep forgetting to try it, I don't have a mop bucket so figured I'd try with a skateboard and golf umbrella. I'll post up when I get to it. I know it'll work, I just know it

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    If the air exits the umbrella backwards then there's a net forward thrust. But which way is the intake facing?

  25. #25
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    Quote Originally Posted by jono View Post
    If the air exits the umbrella backwards then there's a net forward thrust. But which way is the intake facing?
    Both sides, no?

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