All Questions
598
questions
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39
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Idealized Newton's cradle
I was wondering about the conditions for an ideal newtons cradle.
Under regular circumstances, the collisions are inelastic and a newton's cradle dissipates energy in various forms like heat, friction,...
0
votes
5
answers
125
views
Direction of impulse
My textbook has the following problem:
A batsman deflects a ball by an angle of 45° without changing the initial speed which is equal to 54 km/h. What is the impulse imparted to the ball? (Mass of ...
- 342
1
vote
1
answer
69
views
How do you solve instantaneous 3 body collisions
A few years ago I built myself a very basic python program that did some very basic collision mechanics between particles with a mass and velocity and it was helpful in learning a few things and ...
- 111
2
votes
3
answers
81
views
Do bodies stick together after an inelastic oblique collision?
My question is particularly about an oblique collision case. (For example a body having velocity along x axis approaching another with velocity along y axis) From what I know, in perfectly inelastic ...
- 41
4
votes
2
answers
756
views
After how many bounces will a ball's mechanical energy equal zero?
This was a question I asked myself for fun. It turned out to be more difficult than I initially imagined.
The Problem: Let's say a ball is dropped from h0. Air friction is negligible. The collisions ...
- 117
6
votes
3
answers
1k
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Conservation of momentum in Newton's cradle
Imagine a Newton's cradle with 5 balls with mass of each ball is $m$. In a case where two balls are dropped against three balls, if we write an equation considering that momentum is conserved,
$$ 2mu=...
- 145
0
votes
2
answers
68
views
Ball colliding with inclined stationary plane
A particle with mass m1 is dropped from a height onto an incline plane creating the angle $\alpha$ with the ground (the slope is frictionless). The coefficient of restitution is e. Find the angle $\...
0
votes
2
answers
56
views
Would placing sand bags over the top of a car's strut housing reduce the jarring impact felt when the car hits a pothole? [closed]
I live in an urban area where many of the streets have pot holes and some of these streets have some very large and deep potholes. I have been wondering lately if it would be worth the effort to try ...
- 478
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0
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41
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Why does a ball bounce off the wall? [duplicate]
When we throw a ball onto a wall, the ball comes in contact with the wall. And the velocity of the ball comes from V m/s to 0m/s. According Newton’s first law, a force was acted on the ball by the ...
- 21
0
votes
1
answer
26
views
What happens if an object hits stationary objects on a pulley?
What happens if an object with speed $v_i$ and mass $m$ hits two bodies of equal mass (also $m$) on a frictionless pulley at rest, and the colliding body sticks to one of the bodies on the pulley?
I ...
- 103
0
votes
1
answer
43
views
Conservation of Momentum in particle splitting. Is it always conserved?
Let an intially stationary particle $A$ of mass $m$, if $A$ explodes such that it breaks into 2 equal pieces.(Assume no heat or sound energy loss)
The red point is supposed be the point at which the ...
- 367
0
votes
1
answer
84
views
Restitution and inelastic collisions
If particle $A$ and particle $B$ collides in plane or space, we can calculate the impulse $\vec{J}$ from $B$ to $A$ with
$$
\vec{J}=\frac{((\vec{v}_A-\vec{v}_B)\cdot\hat{n})(\epsilon+1)} {\frac{1}{m_a}...
- 75
0
votes
4
answers
51
views
Force of impact on a body [closed]
This is a pretty silly question which got me pondering for a while.
We know that Force of impact on a body is given by $\frac{m(v_f-v_i)}{t}=\frac{mv_i(e+1)}{t}$ where e is the coefficient of ...
- 91
2
votes
4
answers
97
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Forces equal and opposite in elastic collision with different masses?
I just learned about conservation of momentum in my mechanics class.
So say we have two objects, one moving towards another at rest.
I know that in an elastic collision with identical masses, the one ...
- 21
1
vote
1
answer
42
views
Elastic collision between 2 particles in 2D [closed]
A particle with mass $m_1=m$ moves along the x-axis at a velocity of $v_0$ and collides with another particle $m_2=4m$. As a result of the collision $m_1$ travels upwards at an angle of $90 ^\circ$. (...
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