All Questions
35
questions
0
votes
1
answer
57
views
When is it appropriate to say Newtonian gravity is a force? When is it not appropiate? [closed]
Please help me understand the notion of force when it is applied to Newtonian gravity. From my understanding forces in physics involve interactions with at least 2 objects and can cause an ...
- 431
4
votes
2
answers
695
views
General relativity when can we approximate to Newtonian gravity?
Lets consider this scenario in deep void of space where other curvatures of large objects are negligible in this case and we bring 2 objects lets say $A$ and $B$.
We give it a force slightly lower ...
- 441
2
votes
6
answers
804
views
Is the gravitational force a phenomenon or a theoretical invention? [closed]
We use to say that gravitational force is a phenomenon. But since the theory of General Relativity replaced Newtonian gravitational force, how is it possible for a phenomenon to be replaced by a ...
4
votes
3
answers
472
views
How does relativity explain Newton's apple? [duplicate]
You must have heard the anecdote about the apple falling on Newton's head that led him to come up with the concept of Gravity. A long time later, Einstein upgraded it to the General Theory of ...
- 91
0
votes
1
answer
76
views
How do you find the distance between a massive object and its certain gravitational force?
Okay so I know I might've not phrased the question very well so I will give an example to try to make sense of it:
Say we have the moon and a place in space where the moon's gravitational force is 1,...
- 33
1
vote
1
answer
62
views
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
0
votes
3
answers
165
views
Problem with Action-Reaction pairs and gravity [duplicate]
There are lot of question on this site similar to this, but they give contradicting opinions.
When standing on earth, my gravitational pull to the earth and earth's gravitational pull towards me ...
0
votes
1
answer
205
views
Does repulsive or opposite gravitational force exist? [duplicate]
According to Newton's third law of motion, every force have an equal and opposite reaction. So, using that law, is there a reaction of gravitational force that acts in the opposite direction and is ...
- 21
0
votes
2
answers
114
views
Can I cancel out the gravitational force when calculating the gravitational constant? [closed]
Basically, this is what i’m doing:
$$F = m_1a$$
$$F = \frac{Gm_1m_2}{r^2}$$
where:
$F$: gravitational force
$m_1$: mass of the earth
$m_2$: mass of object dropped
$a$: gravitational ...
- 11
0
votes
4
answers
445
views
What is the direction of gravitational constant?
Our book says:
$$\vec F=\dfrac{GMm}{r^2}$$
If Force is a vector quantity, $G$ must also be vector quantity so what is the direction of $G$.
I am a school kid please explain simply and kindly
user224191
-1
votes
1
answer
89
views
In theoretical physics, is the Graviton related to the fundamentals behind the $F = ma$ relationship?
If the Graviton transmits the gravitational force to nuclei within atoms, and an object with mass gains energy by being accelerated (change velocity / change time), does that imply that $F = ma$ is ...
- 31
3
votes
1
answer
752
views
Is the normal force smaller than gravitational force due to earth's rotation? [duplicate]
In physics class we learn that the normal or contact force exactly equals the force of earth's gravity pulling you to the center of the Earth and thus cancel each other out. I thought that the normal ...
-3
votes
1
answer
115
views
What if the "actual" force to accelerate an object was hypothetically 400 x what it currently is? [closed]
Since f=ma, and we derive whatever the force it takes to accelerate a specific mass at a specific acceleration as a unit of force. I understand this ratio of actual force will always be the same in ...
0
votes
3
answers
344
views
Why small planets are not attracted by larger planets due to gravitational force? [duplicate]
Gravitational force means"the force experienced between two heavenly bodies".A body falls on any planet due to gravitational force.But smaller planets are not attracted by larger planets or stars(sun) ...
- 430
0
votes
1
answer
83
views
Forces are confusing? [duplicate]
Why is gravitational force only a pull force ? And why does any force even exist between two uncharged particles . Shouldn't the positive negative attraction be nullified by the positive - positive ...
