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Results tagged with newtonian-mechanics
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user 353
Newtonian mechanics discusses the movement of classical bodies under the influence of forces by applying Newton’s three laws. For more general concepts, use [classical-mechanics]. For Newton’s description of gravity, use [newtonian-gravity].
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How energy conservation is not violated here?
Repeat lifting books to height h several times per minute for an hour or two, and observe who gets tired.
You do work lifting the book, burning up biological energy stored in ATP molecules in your …
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Can you lift yourself standing on a wooden block using pulley mounted on block?
Yes, that should work, though it looks like the person standing on the block might need a good sense of balance.
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Bat hitting a ball
A good swift swing of the bat changes the ball's momentum the most. Recall that force F = change in momentum. According to plain simple Newton's laws, this puts the greatest force on the bat at the …
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How are Euler's laws of motion applied to gyroscopes?
Start off ignoring gravity. The spin axis is horizontal? Well then, you have an L vector. Very simple, nothing happens.
Now turn on gravity. This pulls down on the centre of mass, which is els …
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Escape velocity to intersection of two gravitational fields
The initial kinetic energy needed is whatever it takes to get from the start to the maximum potential between the start and destination.
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2
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How can an object with zero acceleration move?
The forces add to zero, acceleration is zero. If that's how it started, sure, it won't be moving. But initially, someone/something pushed it - forces not balanced, accelerating the block until some …
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How to design a deliberately biased coin?
For demonstrating basic probability concepts, it would be nice to have a coin-like object that lands heads/tails not in 50/50% ratio, but biased in a way that can be revealed in a short experiment. W …
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What is the difference between impulse and momentum?
Impulse is a change in momentum. Naturally it has the same units. It's useful for whacks and thuds and bounces and other more or less sudden changes in motion.
Think of a golf ball struck by a cl …
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Expression of kinetic energy in polar coordinates
If the particle is near the origin, say r=1, then a change in $\alpha$ corresponds to a small physical distance. If the particle is far away, r=1000, then the same change in $\alpha$ corresponds to …
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