All Questions
Tagged with gravity kinematics
56
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State space of free falling object is time variant?
In the case of a free fall object, if $h$ denotes distance from floor and $v$ the speed, then, given an input $U = g$, and $X=[h \quad v]^T$ and $\dot{X}=[\dot{h} \quad \dot{v}]^T$, I found that the ...
8
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6
answers
1k
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How to find the falling time of an object when acceleration is not a constant? [closed]
Let's say we are throwing an object from the surface of the earth, this object reaches 70,000km with initial velocity of $10713 \mathrm{m}/\mathrm{s}$ until it reaches the peak high , the g value at ...
- 81
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Gravitational field of a moving object
Here's a simple scenario:
Let's say, that there are 2 stationary planetoids of equal mass on the Earth's orbital motion path, placed at equal distances from Earth just like on the image below:
Will ...
1
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1
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How to simulate orbits?
I was trying to code a simulator of a solar system, but I cannot find out the orbit trajectory equation. I have simulated my orbits with perfect circles by using the $\cos \alpha$ and $\sin \alpha$, ...
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2
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119
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How to solve this long distance projectile problem? [closed]
A projectile is fired horizontally from the top of a mountain of height 'h' at a very high velocity. The projectile almost completes one revolution around the earth and crash lands at the bottom of ...
- 337
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1
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171
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What is rate of change of Earth's gravity (jerk, 3rd derivative of position)? [closed]
We know that gravity changes with height so there must exist a jerk. Could I know the method to find it. Does there exists jounce(4th derivative of position) for Earth's gravity?
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2
votes
2
answers
293
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What would a graph of distance between two gravitational objects vs time look like?
Lets say there are two objects in space that are attracted to each other, and are a distance r from each other. The gravitation force between the two objects is $$G\frac{Mm}{r^2}$$ As they accelerate, ...
- 59
2
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1
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Why can gravitational acceleration not be detected by experiments
I was doing research into how $G$ forces are calculated, and I was told that they show all acceleration that can be "sensed" by humans (i.e. all non-gravitational acceleration).
This ...
- 318
0
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4
answers
1k
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Acceleration due to gravity during its journey up and down
When we throw an object up into the air, ignoring air resistance, etc, we define acceleration to be -9.8 m/s^2. When it goes down after its journey up, like a parabola, do we define the acceleration ...
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1
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1
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114
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Beads on a frictionless frame of wire [closed]
I was doing a physics problem and though I have the solution, I have derived a general result which I would like to get verified. I will state the problem here :
Two beads q1, q2 of equal mass m can ...
- 73
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1
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357
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Angular acceleration of ball when falling [duplicate]
Why is it assumed that angular acceleration is 0 when a ball is midair after rolling off a surface with constant velocity?
-1
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1
answer
39
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Vertical motion [closed]
Ball $A$ is thrown vertically upward from the top of a $30$ m high building with an initial velocity of $5$ m/s. At the same instant, another ball $B$ is thrown upward from the ground with an initial ...
0
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1
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296
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Path of an object in gravitational field [duplicate]
How do you prove that path of a satellite or a planet is a second degree curve? In other words, how do you prove Kepler's law which states that planets move in elliptical paths?
1
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3
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557
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What is the effect of acceleration due to gravity on horizontal acceleration?
The question is the following:
An object accelerates from rest to $100\,\mathrm{km}$ per hour in $4.0\,\text{seconds}$. What fraction of the acceleration due to gravity is the car's acceleration?
...
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3
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451
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How does an object gain energy when it enters a potential field?
Conservation of energy says total change in energy is $0$.
Let's assume a small object is in outer space (maybe like a football).
It moves towards a planet (assume planet has no atmosphere for ...
