All Questions
Tagged with gravity newtonian-mechanics
317
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How can a person inside from a veiled and free-falling elevator distinguish whether he is in an inertial or non-inertial frame?
From wikipedia: "A non-inertial reference frame is a frame of reference that undergoes acceleration with respect to an inertial frame", according to that statement, I would say that an ...
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3
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358
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If gravity is not a force then why Newton's first 2 laws contradict each other?
I know Newton's laws especially the 1st and 2nd laws of motion:
1st law: object in motion stays in motion unless it is influenced by an outside force.
2nd law: F=ma
So Gravity is not a force, then ...
- 13k
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What will be the tension force in this case?
Suppose I have a block of mass $2\, {\rm kg}$ sitting on my table. Then I connect a string to it and pull it vertically upwards. The resultant acceleration is vertically upwards: $2.2\, {\rm ms}^{-2}$....
- 1,018
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Conceptual Question: What would happen to satellites orbiting the earth if mass of earth suddenly increases? [closed]
Would the satellite crash onto the earth? If so, why, and in what kind of motion? A spiral motion sounds intuitive, but why?
Or there is another possibility: will the satellite continue to execute ...
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Inertia of an elevator
Imagine a situation where we have a relatively light empty elevator moving up at a pretty high constant velocity say something above $10\ m/s$, just so that it has a considerable amount of momentum ...
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2
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71
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Why does the aglet of laces in my jacket hood swing like a pendulum when I walk?
I have observed that the aglet in the laces of my jacket hood swing like a pendulum when I walk. I cannot think of any forces which are the cause of its movement in this way.
So why is it like this.
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Acceleration of the Moon due to the Earth's gravitational pull [closed]
If the Moon has an acceleration of 0.0027 m/s^2 with respect to the earth when in orbit, and it is stopped for an instant and then released, will the acceleration towards the earth now be different? ...
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How to calculate orbit params for transfer before docking?
I have two spacecrafts on two equatorial circular orbits with different phase angles (it could be random, I need a universal solution). Also, I know Kepler's params of both orbits. I want to move one ...
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2
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2
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How to calculate the direction of the velocity vector for a body that moving is on an elliptical orbit?
With circular orbits everything is simple. I just calculate the magnitude of the orbital velocity by $v = \sqrt{\frac u{\text{orbit Height}}}$ and then set the velocity vector as perpendicular to the ...
- 768
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334
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How much work is done to maintain vertical position (hovering) of a drone? [closed]
Ignoring all losses in the efficiency of the means to lift the drone, this would reduce down to resolving the key elements of the equation involving a) the acceleration of gravity and 2) the time, and ...
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Normal force shift for ball kept in cavity
Adapted from JEE advanced paper-1 of 2020
If you see the left side of the Planck which the ball touches, it seems so that as we vary $\theta$, the contribution of the force from that point of contact ...
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5
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162
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Conflicting intuitions about free fall
So I just started studying physics recently, and I came up with a question that I'm not sure how to solve, and I think it may be because of some fundamental misunderstanding. I don't want anyone to ...
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770
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Does an object rolling down a slope have more momentum than a object in free fall?
Physics newbie here. I am trying to figure out in which of the following scenarios would the object end up further from the starting point:
Will a car that veers off a road that has a vertical cliff ...
user313522
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Why can circular motion not be used to calculate kinetic energy of a person standing on Earth?
I did this question: In a sense we all have kinetic energy, even when we are standing still. The earth, with a radius of $6.37×10^6 \mathrm m$, rotates about its axis once a day. Ignoring the earth's ...
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Maximum altitude of a vertical launch taking into account the change in gravity
Say that a body with mass $m$ is launched vertically from the surface of a planet with mass $M$. What is the maximum altitutde the body will reach?
My attempt: the equations
$$\frac{d^2}{dt^2}d(t)=a(...
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