Mass vs. Weight and the Normal Force

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Mass is just a fancy sciency word for weight, right? Wrong! Although related, they aren't the same thing. You'd better find out exactly what the difference is so that you don't look foolish around the water cooler! Oh and the normal force, let's find out what that is too.

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Careful with invoking 3rd law and saying the normal force is the reaction force to gravity. The 3rd law reaction force to the earth pulling on a mass is the mass pulling on the earth. The normal force is often equal to gravity when a=0 because of Newton's 2nd law

aliceflarend

The normal force and its relation to weight, has nothing to do with Newton's third law. It is a coincidence that it is equal and opposite, but it is not the third law counterpart to weight. Its existence has a lot more to do with Newton's second law, as a constraint force to stop the object from accelerating through the surface beneath it.

The third law counterpart to your weight, is the weight of Earth in your own gravitational field. The fact that gravity is a two way street, where both the small and large object pull on each other with equal and opposite forces.

carultch

I sing the intro out loud every time I watch his videos

biggerthaninfinity

Normal force is fun fact a type of elastic force. Normal force is the opposite of pressure force(the F in pressure equation, p=F/A), they are both caused by objects don’t elastic deformation, which our eyes can’t see. So pressure force is caused by your contacting area doing elastic deformation ever so slightly which caused an elastic force and normal force is caused by the other contacting object like the wall doing elastic deformation ever so slightly which also caused an elastic force.
If you are wondering, elastic deformation is the cause of elastic force, it is basically a change in an object’s shape caused by a constant force, but will turn back into how it was with the force is not present, example of that is a spring or a rubber band. And elastic force is just a force caused by that. However it also can be explained in energy, it is caused by elastic potential energy turning into kinetic energy.

TomasshaguaT

The normal force and the weight are not connected to Newtons third law. The gravitational pull on the earth from the object is the opposite force to weight. The opposite force to the normal force is the force the ground experiences due to the normal force.

theolav

This guy sure knows a lot about the science stuff.

onradioactivewaves

Holy moly this is so advanced and it looks like it would take me 1000 years to complete a question about this

Guest-zpcr

"Slow down tubby, you're not on the moon yet."

nickhall

I can understand that whether we move object, amount of mass wouldn't change, but we can easily make a formula for mass from F=mg => m=F/g which will be different on different planets, right?

pxzzvc

0:27 That’s ironic because a scale is used to measure weight not mass.

logannuculaj

A stationary mass, acting weight and rightly applied force results in movement displaces...

#FnN

brd

Weight depends on the location of a mass in the university and depends on gravity

HenryBriskin

I have a doubt
how will be the the unit of weight be newton because it is a unit of force
is the answer like unit of m * unit of g
please tell me

ajinkyadeshpande

So is the normal force the "equal and opposite reaction force" referred to in Newton's 2nd law?

Lucky

I am imagining a person standing still. If weight is the force on the person, is weight also the force the person is giving off in the direction of the center of Earth (or whatever is causing large gravitational field)?

Shmoji