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If the fluid inside the shell is frictionless and without bubbles or sloshing, it may be treated as a solid which does not rotate, but just slides down the ramp. This provides one component of instantaneous acceleration, which you would add to the instantaneous acceleration of the hollow ball. It seems to me that with this method, you needn't combine the ...

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What exactly is mass? My answer will encompass four very different regimes each separated by a factor of 1027. I'll first look at things on the order of 10-27 kg, then 100 kg (1 kg), then 1027 kg, and finally 1054 kg. Mass at the scale of 10-27 kg This is the domain of atoms and elementary particles. A proton has a mass of 1.672621777×10-27 kg, to ...

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What is physics? Physics is the modeling with mathematics of observations in the world around us. It is a way of creating a logical sequence that can be predictive and not only explanatory. It reduces the innumerable constants one would need to describe, for example , the trajectory of a ball with just space coordinates, to a simple parabolic function that ...

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Since your tags are "newtonian-gravity" and "mass" I will attempt to answer this question in a classical framework. In classical mechanics, mass is essentially defined as a measure of an object's inertia. Let me explain further. We have Newton's second law $$F_\text{net}=ma$$ which is assumed to hold for all objects in classical mechanics. Suppose we ...

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In classical physics mass has two definitions: It measures the amount of inertia that you have. In order to accelerate something you have to apply a force to it. The heavier your thing is, the less it will accelerate, $$a = \frac{F}{m} \, .$$ If you know the force and can measure the acceleration, you have access to the mass. In the physics of gravity, ...

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It happens, it's just (as Sidd said) not as noticeable. I would like to suggest the following experiment: wear a chain, necklace, or bracelet--something with some dangle to it. You should see that during braking/acceleration it no longer hangs straight down.

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The inertial force is proportional to both the acceleration of the system and the mass of the object in question. Hair are light, and thus you don't see the effects without severe acceleration. The clothing are worn, and hence supported by one's body. So they won't move till the body does.

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