Pure maths, physics, logic (braingames.ru): non-trade-related brain games - page 60
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The one that doesn't clean.
Why? It's supposed to depend on how the friction changes.
Nothing depends on friction at all.
What else makes trolleys stop?
Justify it, Andrei. I have the same answer, but the moderator doesn't accept it. The answer may be correct, but my reasoning is wrong.
What else do the trolleys stop from?
1 from friction in the axles
2 from falling snow (the mass of snow falls vertically)
1 from friction in the axles
2 from falling snow (mass of snow falling vertically)
Vertically falling snow does not affect the momentum of carts that are directed horizontally.
Write the equations of motion.
Swap the snowflake for a poodle weight
Lower the kettlebell vertically with your hand onto a passing trolley
The kettlebell went horizontally.
It took energy from the cart.
The cart has slowed down in proportion to the weight of the weight.