All Questions
Tagged with gravity kinematics
56
questions
12
votes
1
answer
6k
views
How does this magnetic toy work?
A nephew of mine has this toy called "Gravitrax". It is basically a track building kit - you can build various tracks for iron balls which go through the track thanks to gravity.
However, there is ...
- 275
-1
votes
2
answers
97
views
Distance an object has fallen given time
I am in Honors Physics, and need help understanding this:
The acceleration of Earth's gravity is 9.8 $m/s^2$, so when an object starts from rest, 9.8 $= x/t^2$, where $x$ is distance the object will ...
- 101
0
votes
1
answer
26
views
Finding the continuous increase in speed while diving toward the ground
https://youtu.be/HJO6WuoytGA?t=39s
In this game, the character jumps from the top of the Empire State Building (443.2m), and in a fraction of a second, he breaks Mach 1 just by releasing a great deal ...
- 1
2
votes
2
answers
121
views
total weight experienced in Five ball Cascade
An expert juggler, carrying five juggling balls, has to cross a swing bridge which has a maximum load rating of 50 kg. The juggler weighs 47kg and each of his 5 balls weigh 2kg. He believes that he ...
- 23
2
votes
1
answer
1k
views
Free fall and terminal velocity
An object in free fall is defined as one that is moving solely under the influence of gravity.
So if an object has reached terminal velocity(force of gravity is cancelled out by upwards force of ...
- 104
-4
votes
4
answers
2k
views
What is the evidence for the existence of gravity [closed]
I have recently been wondering that what good evidence proves the existence of gravity (besides the Cavendish experiment).
I would like straightforward answers that are on point. I will be willing to ...
- 53
1
vote
2
answers
15k
views
Calculating height of a ball formula based on bounce
I'm trying to figure out a formula for the new height of a ball, up until it stops bouncing.
The time iteration between each could be for example one second; and gravity of course would be 9.8
I've ...
1
vote
5
answers
473
views
Calculating relative distance covered
Two balls 'A' and 'B' are thrown vertically upwards with the same velocity. The mass of A is greater than that of B. We need to find which of the balls reaches a greater height (assuming the effect of ...
- 15
2
votes
2
answers
695
views
Is the magnitude and direction of gravity on an object the same as the objects vertical velocity?
I need to make a diagram for an entry level college physics class. I need to show the magnitude and direction of gravity on a flying object and also show the magnitude and direction of the objects ...
- 21
1
vote
1
answer
13k
views
Position / velocity / acceleration vs time graphs when falling towards a black hole
In Newtonian physics, as far as I understand it, for a small object falling towards a massive object, the graphs of position, speed and acceleration vs time look like this:
(If the massive object is ...
- 355
-1
votes
1
answer
226
views
How Do Low Kinetic Energy and High Kinetic Energy Atoms Attraction differ?
Will atoms of 2 difrent energy levels electron and/or Kinetic attract more than 2 Atoms at he same energy level? Do 2 high energy level atoms attract more than 2 low energy atoms?
- 1
0
votes
0
answers
33
views
In Which Position A Co-passanger should Sit On A Turning Bike
Pardon me for this very basic mechanical science question. But I just want to clear my doubt it. Whenever I sit a behind someone on a bike I get confused when the the bike has to take a sharp turn.
I ...
- 215
0
votes
1
answer
80
views
Minimum Distance for "Speed of Light Approach"
I tried to calculate the minimum distance between a planet and a test mass for the mass to attain the speed of light on colliding with the planet's surface if it were released from rest at the initial ...
- 833
0
votes
3
answers
35k
views
When does acceleration due to gravity equal positive/negative? [closed]
For example a projectile is launched at an angle. What would $a$ in $y=vt +.5at^2$ be?
Let's say I choose up to be positive. How do you not confuse yourself whether to use positive or negative $a$?
- 13
0
votes
2
answers
203
views
Is there a mistake in this example in my mechanics textbook?
This is a worked example in my mechanics book:
But I think this worked example is wrong. In the 6th line. shouldn't $X=4R$ as the expression for distance above the surface is $(X-R)$ and when the ...
- 2,137