All Questions
Tagged with newtonian-gravity projectile
200
questions
-2
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2
answers
154
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Why does the size of the ball change?
I am reading Head First Physics.
On page 372 it states that the size of the ball changes. I have checked my previous notes, but I cannot understand why?
Here is a picture of the page:
- 117
0
votes
1
answer
171
views
What is the gravity/inertia question?
Is the discussion about how gravity and inertia are the same, about the idea that when you hit a ball, it doesn't come back but when you throw a ball up, it does come back?
-3
votes
2
answers
1k
views
Will gravity affect a ball moving horizontally across the floor?
I was solving an exam when I came across this question:
A compressed spring projects a ball horizontally in a vacuum chamber. On the Earth, the ball reaches the chamber floor 4.0 m in front of the ...
- 377
0
votes
7
answers
387
views
Vertical motion of an object
We define acceleration as $-9.8\frac{m}{s^2}$ for an object that is thrown upwards due to gravity. My question is when the object reaches maximum height at the point where it is about to turn around ...
- 23
2
votes
3
answers
523
views
Why is a projectile trajectory parabolic while that of a satellite elliptic?
I understand that the parabolic trajectory is an approximation of a more elliptical trajectory, since acceleration due to gravity is taken to be a constant for a projectile. However I'm intrigued to ...
- 122
-1
votes
2
answers
67
views
Why does the property of a projectile is different from a parabola (with the opening downward) represented by a quadratic equation?
The property of a projectile make me think about those sine and cosine graphs I had learned in trigonometry class, which the distance between every two points on that parabola is the same but the ...
- 37
1
vote
1
answer
463
views
How to determine where an object will land on a variable elevation surface?
I'm making a game and I need to figure out the exact point on a hilly surface where the car will land after the jump.
Here is an image:
So since this is a game, it's very easy for me to figure out ...
- 13
0
votes
2
answers
119
views
Sign Problem When Dealing With Quadratic Air Resistance and Gravity [closed]
While dealing with an object falling vertically, and subject to quadratic air resistance, an equation of motion that is often presented is
\begin{equation*}
m\dot{v} =mg-cv^{2}
\end{equation*}
In ...
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-5
votes
3
answers
334
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Does the object have acceleration in the tangential direction of the path? [closed]
Objects thrown horizontally fall freely along the path of the parabola. Does the object have acceleration in the tangential direction of the path? I think it is, but someone told me it was not. He ...
- 2,040
0
votes
1
answer
67
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Maximum height of a projectile [closed]
How do I calculate the maximum height of a projectile that I throw straight up if all the information I have is the total time of the projectile in the air (which is 4 seconds) with an equation?
- 1
-1
votes
1
answer
83
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Moving objects released
There is a balloon moving upwards with a small object attached to its bottom. If the object is released after some time, then will it start moving downwards suddenly, or will it move up a little with ...
- 1
0
votes
1
answer
673
views
Minimum Velocity for a projectile to leave the Earth
Let's say we have a cannonball that can shoot at various angles. How would we find the minimum velocity for this projectile to leave the Earth when the cannonball is shot at an angle $\theta$. I think ...
- 3
3
votes
4
answers
3k
views
Why is the mechanical energy of a free falling object conserved?
My textbook says that in an isolated system (when there is no external force and the internal forces are conservative)the mechanical energy of the system remains constant.
It then states the example ...
1
vote
1
answer
98
views
Why does a bullet shot from a gun take so long to fall? [duplicate]
If you just drop a standard lead bullet, it falls in like 1 second. If you shoot it from a gun, why does it take so long to fall down? Doesn't gravity pull on it the same speed?
0
votes
2
answers
778
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If two identical balls were dropped from the same height, but one of them was given a push to the side also, which would hit the ground first and why? [duplicate]
I was wondering if two identical balls were dropped from say, 10 meters, but one of them was given a push to the side whilst dropped, which would hit the ground first and why? Would the ball that was ...