# Tagged Questions

Newtonian mechanics covers the discussion of the movement of classical bodies under the influence of forces by making use of Newton’s three laws. For more general discussion of energy, momentum conservation etc., use classical-mechanics, for Newton’s description of gravity, use newtonian-gravity.

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### What is the outward force on the Moon that makes it go in orbit rather that falling straight to the Earth? [duplicate]

So, we know that the gravity is responsible for pulling the Moon towards the Earth. But because it moves in an orbit, it makes me think that there must be a force that is causing the moon to travel in ...
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### If action equals reaction, how is it ever possible to win in martial arts?

In kick-boxing, when a fighter's leg hits an opponents leg, the outcome, based on Newton's 3rd law, should be the same for each fighter. It's not even important who kicked who, as in the moment of ...
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### Understanding $F=ma$

I know the formula F=ma, but I truly need to understand its implications. Take this scenario for example, we have two bullets exactly the same weight and size (identical to each other). Lets assume ...
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### Two objects at different heights, would they be traveling the same speed?

If I were to drop an object at a height of 15 feet, then another object of the same mass at 20 feet, would both objects be traveling at the same speed? What would be the speed of which they are ...
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### Apply force to one end of a rod in space: why not purely translational? [duplicate]

Why does applying force to a rod in space (or any other isolated systems) on one end leads to both translational and rotational motion? Here's my logic: suppose there is a rod in space. We ...
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### Action and Reaction between two people

When you hit a person, you apply a force on him. Then according to Newton's third law, there should be an equal and opposite reaction, and that should act on you. So, why don't you fall backward? Is ...
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### Finding velocity from distance and gravity

Basically, I have a problem that asks: An object is launched to a height of 2 miles, what was it's initial speed and time. Now normally something like this would be fairly basic. The problem ...
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### Would a titanium suit save your life from a piano falling on you? [closed]

Or would the piano dent the titanium and kill you?
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### How to write the moment equation about a rotating as well as translating point?

I want to write the moment equation in Ground frame as well as the frame of reference of the point (which I think should be a rotating frame of reference) for the following situation. $C$ is the ...
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### What is meant by saying the work done by a conservative force is -(change in PE)?

I read through all related questions, and they are almost the same, but I still didn't understand this and so am asking again. What is meant when we say that the work done by conservative force is = -...