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Results tagged with newtonian-mechanics
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user 68181
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].
2
votes
Accepted
Adding an additional fan to a fan powered sail according to Newton's 3rd Law?
If you add a second fan, the boat still won't move (using this model). You will have twice the air pressure force acting on the sail, but also two fans that are pushing backward on the boat, so the fo …
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2
votes
Accepted
Center of mass - weighing espresso grind in portafilter with the handle on the table
This seems legit to me. When you apply a vertical downward force to a beam that is supported at both ends (which this could be modeled as), the effect on the reaction forces from the two supports depe …
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1
vote
Accepted
Work of normal force
@levitopher's answer is good, but I just want to add that you are doing work with your foot when you press the brake pedal; however, that work is just going into compressing the springs which, in thei …
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10
votes
Why is the equation for friction so simple?
It's so simple because it just happens to be a very simple, idealistic model for explaining how friction acts. In reality, friction is significantly more complicated - for instance you have static/dy …
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2
votes
Can you ever exert more downwards force than your weight?
Sure, I can think of a couple of ways you can exert more downwards force than your weight:
Brace against something above you with your hands, e.g. a low ceiling. Then, push against that with your h …
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2
votes
Accepted
When pressure is exerted on parallel hydraulic pistons, do they start extending at the same ...
Initially, I agreed with Olaf Chujko's answer to this question; however, on further reflection, I think the most accurate answer is 'it depends':
Firstly, from the schematic that is given, when switc …
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1
vote
Why this incident happens?
The question is still a little unclear; however, two things I can think of are:
The downwards displacement of the horizontal rope results in a small change of the horizontal position of the connecti …
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0
votes
How to conceptualize Newton's apple?
I think the important thing to bear in mind is that in classical dynamics, before you can have motion, there has to be acceleration, and before there can be acceleration, there has to be a force actin …
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1
vote
Fluid flow around pipe, over end of pipe
Since the inner pipe has one end closed, there can't be any average flow velocity through it, which means there also can't be any pressure gradient along its length. So, in a steady flow, I would expe …
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3
votes
If a drop of water hits something at bullet speed, will it damage it?
Wet steam erosion is a big problem in steam turbine design, as you can see from this image:
So yes, water droplets with enough energy can certainly cause damage to even objects made of steel. With …
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0
votes
Question on work, energy and power
Really, the question should state: “assuming the frictional force on the train (i.e. $F$) is constant”, as the answer they give depends on that.
In reality, F will be composed of two main components: …
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2
votes
How much does NASCAR affect the rotation of the Earth?
I don't think it would. The main reason is that a car gains momentum (including, possibly angular) as it speeds up, but it must also relinquish that momentum again, when it slows down and stops.
So, …
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1
vote
Potential energy of springs and gravity, and work of a force
The 'easiest' way to solve this is by using energy, as suggested by the OP and Farcher. Start by summing the gravitation and spring potential energies as follows:
$$E = -mg\frac{l}{2} sin\theta + \fr …
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