All Questions
17
questions
0
votes
1
answer
44
views
The locus of the velocity vectors of a boat navigating in the sea under the presence of a very strong wind?
I already asked a question very similar to this one here and I think the solution would not work when the boat navigates in the sea when a very strong wind blows. That is I am trying to find the ...
- 159
1
vote
0
answers
37
views
Is e (COR) defined for whole situation or just during collision
According to wikipedia
$${\text{Coefficient of restitution }}(e)={\frac {\left|{\text{Relative velocity after collision}}\right|}{\left|{\text{Relative velocity before collision}}\right|}}$$
...
- 379
7
votes
6
answers
2k
views
Is it wrong to just say that things continue at constant velocity unless acted upon, as velocity is only relative?
Like when saying that people mistakenly thought things automatically slowed down after being thrown etc (accelerated), because that's just due to all the air or surface friction or gravity. Do you ...
user326693
1
vote
3
answers
9k
views
What exactly will happen if you jump in the upward direction from a roof of on a moving car?
I'm not a physicist and I'm a little bit puzzled with the image below:
I know it's a joke but if we assume we don't have air resistance what exactly will happen if someone jump in the upward ...
- 13
2
votes
2
answers
129
views
Confusion regarding Inelastic Collisions contradicting my book
Suppose two bodies $A$ and $B$ with equal mass are kept at a distance. $A$ starts moving towards $B$ at a constant velocity, they hit, and I assume that it is a PERFECTLY INELASTIC collision here.
...
- 1,168
-1
votes
2
answers
91
views
Velocity Question from grandparent
My Grandparent asked me this question a few years ago, and I am getting around to giving him an answer, but I don't know the answer. Can anyone help?
"A pickup truck is speeding along a highway ...
- 21
0
votes
2
answers
84
views
How to decide which velocity is bigger in a collision before writing velocity of approach and velocity of separation?
My teacher said that velocity of separation is $V_1$- $V_2$ where $V_1$ is greater than $V_2$ and said same for velocity of approach. The problem is how would you determine which velocity is greater ...
- 5
5
votes
1
answer
3k
views
Why do we hold umbrellas upright while walking?
Recently I encountered this (quite interesting) question:
Rain is falling vertically. A man running on the road keeps his umbrella tilted but a man standing on the street keeps his umbrella ...
user249968
1
vote
1
answer
55
views
Actual velocity of an non-accelerating object in Newtonian physics
How was the velocity of an non-accelerating object (i.e moving at a constant velocity) in empty space, determined in Newtonian physics? Did Newton also considered it to be at rest, if not how is its ...
- 141
0
votes
3
answers
125
views
Kinetic energy of an object
We know that motion is relative. So let an object(o) be moving with a certain velocity with respect to an object (A).If another object (B) is moving with respect to (A) at a given moment and they ...
- 182
-2
votes
5
answers
1k
views
What is the correct formula for relative velocity?
I have consulted byjus.com, Concepts of Physics by HC Verma and Khan academy, all have different statements. Byjus and HC Verma book states that the formula for relative velocity is $V_a +V_b$ but in ...
1
vote
2
answers
147
views
Relativity of velocity while riding a bike
I was trying to think of a situation in which an observer would be able to determine whether he is moving or not. Since velocity is a relative quantity I was unable to do so.
However, consider a ...
- 444
0
votes
2
answers
165
views
The mechanics of retention of velocity/acceleration when an object is dropped from a moving body
This might seem a stupid question but please help me out because I'm very confused.
We say that when an object is dropped from a moving body (moving with constant acceleration $a$) It has the ...
- 11
4
votes
3
answers
776
views
Do bullet/gun physics change if the gun is traveling very fast?
If I'm running at say $400\: \mathrm{m/s}$ and a bullet travels at $400\: \mathrm{m/s}$ and I fire the gun, will I see the bullet leave the barrel?
I either see it stay in the barrel floating ...
user35678
4
votes
1
answer
2k
views
Does a fly get brought up to speed with a bus?
Consider a scenario where a bus is moving at a constant speed and a fly enters through a window,the fly is also flying at a constant speed.
Since the bus is not in contact with the fly and neither is ...
- 161