The reason you don't fall to earth in the space shuttle is because of the speed it is travelling at it is free falling to earth at the same rate as the earth is curving
If you are saying that if you are in a space craft, there is no force pushing back, but then why when you are in an airplane there is a force pushing back? Is it because of the height or is it because of the speed?
@TheIndianMan100 In an airplane you're not falling, but in a spaceship you fall constantly and travel perpendicular to the force of gravity pulling you down. Without gravity you would travel in a straight line, but gravity bends your traveling path, also the earth's surface is bending below you so you never reach the ground. If the airplane starts falling you would feel weightless and hover inside, in the spaceship you're also falling but never reaching the ground. Is this clearer?
if professor davidson is getting so mad at peoples lamentable scientific slash mathematical education shouldnt he differentiate the terms "mass" and "weight"? 200lbs is not "weight" it is mass, weight is measured in Newtons. A mass of 200lbs only has weight when it interacts with a gravitational field of another mass.
Sorry, but perhaps you have proven my point. The pound is a unit of weight or force in the English system, the counterpart to the Newton in the metric system. The slug is the unit of mass in the English system, the counterpart to the kilogram. You can look it up. A "mass of 220 lbs" makes no more sense than a "weight of 100 kilograms."
but they are not SI units.. the kg measures mass, the SI unit for force (or weight) is Kgms^-1 or the "newton" when you step on the scales and see 220lbs, that is clearly your mass, not your weight, since if you take those scales to another planet you will register a different number. A mass of 220lbs measures the quantity of matter, the weight of 100kg measures nothing because the unit does not describe the forces acting on the matter.
Why are heavier objects harder to hold in your hand? I understand that heavier objects have more inertia than lighter objects according to the principle of equivalence. I also understand that heavy objects experience more gravitiational pull.
My question is why does not the additional inertiaof heavier objects cancel out the additional gravitational force. In which case light and heavy objects would "fee"l the same weight if held in the hand?
Moving at a constant speed in a straight direction will have no effect on us. Acceleration or deceleration (speeding up or slowing down) is what we feel.
We also experience acceleration at a constant speed when not moving in a straight direction. For example, turning in a car on a curve at a constant speed will throw your body to one side. The earth is not moving in a straight line, but the curve is so slight we do not feel that type of acceleration.
the galaxy and the solar system are also movvng. the earth is moving that fast relative to it's own axis, we cant feel it because all the air arround us moves at the same speed, but to an observer in say the andromea galaxy we are moving at an increadibly fast speed. Relative to your computer now though u are moving at 0ms^-1.
So, if there was no other influence, say outside our universe, if i was infinitely far away from earth there would be no gravity because infinity squared is infinity and its inverse would be 1/infinity which is equal to zero? :) i just wanted to sound smart, but is this true?
BTW, the concept is called micro-gravity
muscle151 3 months ago in playlist More videos from Davidson1956
The reason you don't fall to earth in the space shuttle is because of the speed it is travelling at it is free falling to earth at the same rate as the earth is curving
spineless8 8 months ago
This video really helped my studying, thank you !
InTheStateOfIndianna 9 months ago
basically, weight= resistance of gravity?
StitchedMusik 1 year ago
Anyone knows why this is his last video?
AcDcFoReVeR1993 1 year ago
@AcDcFoReVeR1993 He should really come out with some more he's good (better than my teacher)
jakejakeboom 10 months ago
Great video. Thanks.
KirbyNp 1 year ago
If you are saying that if you are in a space craft, there is no force pushing back, but then why when you are in an airplane there is a force pushing back? Is it because of the height or is it because of the speed?
TheIndianMan100 1 year ago
@TheIndianMan100 In an airplane you're not falling, but in a spaceship you fall constantly and travel perpendicular to the force of gravity pulling you down. Without gravity you would travel in a straight line, but gravity bends your traveling path, also the earth's surface is bending below you so you never reach the ground. If the airplane starts falling you would feel weightless and hover inside, in the spaceship you're also falling but never reaching the ground. Is this clearer?
GR1o6180339887498948 1 year ago
if professor davidson is getting so mad at peoples lamentable scientific slash mathematical education shouldnt he differentiate the terms "mass" and "weight"? 200lbs is not "weight" it is mass, weight is measured in Newtons. A mass of 200lbs only has weight when it interacts with a gravitational field of another mass.
paulio2293 2 years ago
Sorry, but perhaps you have proven my point. The pound is a unit of weight or force in the English system, the counterpart to the Newton in the metric system. The slug is the unit of mass in the English system, the counterpart to the kilogram. You can look it up. A "mass of 220 lbs" makes no more sense than a "weight of 100 kilograms."
DavidsonSSCC 2 years ago
but they are not SI units.. the kg measures mass, the SI unit for force (or weight) is Kgms^-1 or the "newton" when you step on the scales and see 220lbs, that is clearly your mass, not your weight, since if you take those scales to another planet you will register a different number. A mass of 220lbs measures the quantity of matter, the weight of 100kg measures nothing because the unit does not describe the forces acting on the matter.
paulio2293 2 years ago
Why are heavier objects harder to hold in your hand? I understand that heavier objects have more inertia than lighter objects according to the principle of equivalence. I also understand that heavy objects experience more gravitiational pull.
My question is why does not the additional inertiaof heavier objects cancel out the additional gravitational force. In which case light and heavy objects would "fee"l the same weight if held in the hand?
mikewalker2233 2 years ago
I heard the earth moves 67,000 miles an hour. If this so then so we human being are moving 67,000 miles an hour.
So how come when you put a human inside of very fast aircraft, it has negative effects on the body?
wakil5555 2 years ago
Great question!
Moving at a constant speed in a straight direction will have no effect on us. Acceleration or deceleration (speeding up or slowing down) is what we feel.
We also experience acceleration at a constant speed when not moving in a straight direction. For example, turning in a car on a curve at a constant speed will throw your body to one side. The earth is not moving in a straight line, but the curve is so slight we do not feel that type of acceleration.
DavidsonSSCC 2 years ago
Thank you.
wakil5555 2 years ago
the galaxy and the solar system are also movvng. the earth is moving that fast relative to it's own axis, we cant feel it because all the air arround us moves at the same speed, but to an observer in say the andromea galaxy we are moving at an increadibly fast speed. Relative to your computer now though u are moving at 0ms^-1.
paulio2293 2 years ago
good video. i wish more science professors at my school could lecture as clearly as you do.
filipcheng 2 years ago
you couldn't wait 9 minutes to learn a universal truth that eluded mankind for thousands of years?
cantorock 2 years ago 5
wrong, sir isaac newton was not the first one! it was actually written in the rig veda MANY years earlier!!!
avisbaby 2 years ago
So, if there was no other influence, say outside our universe, if i was infinitely far away from earth there would be no gravity because infinity squared is infinity and its inverse would be 1/infinity which is equal to zero? :) i just wanted to sound smart, but is this true?
StudioThunder1999 3 years ago
The statement 1/infinity=0 is the informal, though mathematically inaccurate form of the following statement: lim 1/x = 0 (1) x→∞
Or in words: the limit of 1/x, as x approaches infinity equals zero. As x gets (arbitrarily) large, 1/x gets (arbitrarily) small.
Note that x is never equal to infinity, but x is unbounded for infinitely increasing values.
perez79 3 years ago
This Helps Me SOOOO much on my science report. I would never have guessed that...
YakmanOx 3 years ago
Interesting. I would have been the one to say because there is no gravity.
OmegaX06 3 years ago 4