All Questions
Tagged with newtonian-gravity free-body-diagram
137
questions
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Can a thin pole break or be cog-sensitive under the influence of gravity?
When we consider such a phenomenon, what I am wondering is that the body of an object having a thin radius seems to cause the center post to be broken or the cog to be very sensitive, but why should I ...
- 49
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57
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How can vertical force due to gravity vary in a column?
Non-physicist asking.
Suppose I have a tall building or column. The downward pressure on the walls near the foundations is intuitively greater than at the top of the building. Yet according to Newton, ...
- 3,006
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2
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351
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Loop de loop free body diagram [closed]
I'm trying to understand the situation where a roller coaster goes around a loop, and we need to find the minimum speed it takes not to fall off.
What I'm not understanding is why we would set the ...
- 131
4
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3
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256
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Could you feel your weight falling through the a tube drilled through the center of the earth?
Suppose you drill a hole through the center of the earth (assume the earth is uniform and no air resistance) and you jump in. Would you be "weightless" throughout the entire fall?
The reason ...
- 396
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2
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61
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Theoretical question about elevators [closed]
Question
Imagine we put a bascule/weighing machine in an elevator, and that elevator starts to acelerate downwards with a certain aceleration that we don't know of. Is it true that the bascule will ...
user348118
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3
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547
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Why is the normal force always perpendicular to the surface rather than opposing the force?
In the classic "box on a ramp" example, how does it know which way is perpendicular? If the normal force was opposite of gravity, the force being applied, it would still constrain the box ...
2
votes
1
answer
509
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Weight at an angle
My physics knowledge is pretty basic, somebody suggested that I'll get the definitive answer of below question here.
Imagine a barbell of mass m (kg) which is ...
- 23
1
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1
answer
89
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In simple terms, why does a skateboard slide in the opposite direction of its falling rider?
I would like to have a better understanding of something I’ve observed:
If I stand on a skateboard at rest, there is no movement.
If I lift my left leg, my body of course starts to fall to the left, ...
- 11
1
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2
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95
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How do Parabolic Flights exactly work?
I understand how one can feel weightless in an elevator - in the person's reference frame, they are not being pushed up by the floor.
However, I don't understand how this can occur in parabolic flight....
- 47
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1
answer
45
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Gravity in stationary space
Since 95% of the Earth's gravity remains even at an altitude of 100 miles from the surface, a spacecraft in orbit maintains balance between Earth's gravity & centrifugal force. While in orbit, ...
- 186
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3
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638
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Apparent weight due to the rotation of earth
My concern here is that, if you were to calculate the apparent weight of an object due to earth's rotation at the equator, most text books use centripetal force and it works totally fine, but when it ...
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4
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4
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191
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What is the microsopic reason why hot air rise? [duplicate]
The common explanation for why hot air rises is a macroscopic one. That is that the hot air is higher pressure, lower density, and therefore gravity affects it differently than the surrounding cold ...
- 684
2
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1
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130
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How is the weight of a hanging block communicated to a scale?
I read in a physics text (Tipler, Physics for Scientists and Engineers, 5th ed.) that if we have a scale, and on the scale is a hollow box of mass $M$, and inside the box is a block of mass m hanging ...
- 693
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2
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494
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Are we feeling 1g or 2g?
I know the acceleration by gravity is 1g, but what about the force of the floor exerting on us? is like if we replace the floor with a propulsed object going at 1g, Wouldn't the 1g of the floor or ...
user323174
1
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1
answer
43
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What is opposite to $\mathbf{w}_\parallel$ in a FBD of a box on a ramp?
I tried doing research on this but to no avail so my question is this:
If the normal force of an object with mass $m$ on a ramp inclined with angle $0<\theta<90^\circ$ is equal and opposite to ...
