All Questions
Tagged with gravity kinematics
56
questions
1
vote
3
answers
71
views
How much time does it take for an object to fall from space? [closed]
Let's say there's an object of mass $m$ in space, $h$ meters away from the surface of the Earth. $h$ is large enough that $g$ cannot be assumed to be constant. The acceleration varies according to ...
- 119
-2
votes
3
answers
57
views
Work energy and power [closed]
I saw this in a textbook and I want to confirm if it's true
If a body of mass m rolls down an
inclined plane of height h and length l (hypotenuse), the work done is mgh. It is the vertical height of ...
1
vote
1
answer
44
views
Defining Free Fall: Does Gravity Need to be the Sole Force Present?
Can a scenario be considered free fall in physics if the work done by forces other than gravity is zero, but those forces are still present? Or is it necessary for gravity to be the only force present ...
- 647
0
votes
3
answers
172
views
Need help solving a projectile motion problem: finding the angle for a thrown ball to intersect with a vertically falling ball
The problem states that a ball is dropped from rest and falls under the influence of gravity (neglecting air resistance). At the same time, another ball is thrown with an initial velocity of v0 from a ...
- 19
0
votes
2
answers
41
views
Ramp friction error: Answer seems to depend on coordinate system
I am a junior level mechanical engineering student, and have taken physics, statics, dynamics, etc. so I know how to do this problem, though something seems to be tripping me up.
Given a standard ramp ...
- 15
0
votes
2
answers
162
views
Angle of projection for the minimum time of flight for a given range
If a projectile has to cover a fixed range under gravity, then what should be the angle of projection for the total time of flight to be minimum?
The initial and final point of the projectile are both ...
- 33
1
vote
0
answers
33
views
Difference between geodesics on surfaces and paths under gravitiational fields
Sorry for the maybe silly question, but I'm a math student and I'm not able to find the answer to this question from the physics point of view.
Let us suppose that a ball is set in a non equilibrium ...
- 111
0
votes
1
answer
86
views
An object falling from very far would have varying acceleration, how can that be accounted for?
I want to have a function that describes where a falling object is.
Like this one:
h(t) = -g*t²/2
But this one is for the usual close to the surface case, where there is no variation of gravity due to ...
- 101
-1
votes
4
answers
125
views
Initial velocity of a body when the distance travelled by it in the last second before reaching its maximum height is $5\ \textrm{m}$ [closed]
I stumbled upon this problem recently, and it has been haunting me for more than a day at this point. The question is as follows:-
When a ball is thrown up, it reaches a maximum height of $h$, ...
- 103
1
vote
1
answer
24
views
How would look like the distribution of warmer and colder air molecules inside a spacestation with no gravity?
How would look like the distribution of warmer and colder air molecules inside a spacestation with no gravity? Also how would look like the form of the fire when somebody lights up a piece of paper?
- 2,245
0
votes
1
answer
168
views
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 ...
1
vote
5
answers
162
views
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 ...
- 23
2
votes
3
answers
334
views
Should the stars of a relativistic binary system have tangential acceleration?
Should the stars of a relativistic binary system have tangential acceleration?
- 1,825
1
vote
1
answer
123
views
The behaviour of acceleration of a ball in motion
I have a few doubts on how the acceleration of a ball works when we throw it up in the air, In my mind, I could imagine it in some different "real world" cases, So I am listing them all down,...
- 209
1
vote
2
answers
500
views
Gravitational Force & Normal Force
Imagine a moving ice-block on an extremely smooth (i.e. friction is zero) and circular, rogue planet devoid of an atmosphere. Assuming that the planet in question is far away from any (massive) object ...
- 413