All Questions
19
questions
0
votes
0
answers
51
views
Why is throwing a bullet by hands not effective as using a gun? [duplicate]
The bullet when fired applies equal and opposite force to the Gun, (Newton's 3rd law)
Thus to keep the gun stable we apply some force which should be equal to the force applied by the bullet.
If we ...
6
votes
3
answers
516
views
Interesting answer as a range of tension in pulley-block-plane system
I want some intuitive understanding on why there will be a range in tension in the below question. (On solving we will get that the system is at rest ($a=0$) and since its starts from rest the blocks ...
- 95
0
votes
2
answers
91
views
Why does these two masses not have same acceleration? [closed]
Assumptions: No friction , $m_2$=5kg and $z_1$=2kg. $z_2$ is fixed at its place.
Here, there is a mass of $5kg$ on a movable wedge of mass $2kg$. So, my question is that can we say that acceleration ...
- 33
-2
votes
4
answers
490
views
Is this an exception to Newton's Second Law of Motion?
If a ball in an experiment is dropped from two different heights, 6 feet and 12 feet, why would we need to exert more force when we catch the ball that is dropped from the height of 12 feet? According ...
user282164
0
votes
2
answers
158
views
Force equations for a particle in a non-inertial frame of reference
I am familiar with Pseudo forces and how we use them in accelerating reference frames. My question is a bit specific. Let’s say I am accelerating at $a\frac{m}{s^2}$ and holding a tennis ball of mass $...
- 866
0
votes
1
answer
489
views
Forces acting on a book on a moving table [closed]
I’m studying for an upcoming physics exam and one of the sample questions essentially boils down to this: a book (not clamped on) is on a table that is moving to the left. Is there a force of static ...
1
vote
2
answers
655
views
On methods to know the type of friction [duplicate]
Suppose three blocks are stacked, one on the another and a constant force is applied on the bottom one, how could I know if the friction that is acting on those objects is kinetic or static? Moreover, ...
- 65
0
votes
1
answer
129
views
Is it correct to use Newton's third law on all these scenarios? [closed]
So I was thinking about Newton's third law for sometime lately, and my problem is more about the concept, I'm fine with solving problems.
I thought of these scenarios and tried to apply Newton's three ...
- 157
0
votes
1
answer
768
views
Rolling resistance in relation to diameter [closed]
I am trying to determine the effects the radius of a wheel has on its ability to move across soft ground materials and have found the formula. Would this formula suggest that rolling resistance is ...
- 11
-1
votes
1
answer
184
views
What are the effects of diameter and width on a wheels ability to move on soft surfaces?
Often larger tires with a greater thickness are used for moving across soft surfaces such as sand. In relation to the diameter and width of tires, how do these properties provide better movability on ...
- 11
1
vote
2
answers
2k
views
Directions of static & kinetic friction?
Static friction :
Static friction opposes relative motion between two surfaces. The car is moving at some tangential velocity relative to the road. Thus, static friction should act in the opposite ...
- 27
0
votes
2
answers
118
views
Changing mass and relative motion
Sand is pouring vertically on a cart at J [kg/sec], from negligable hight. The cart is standing on top of a frictionless surface. What force F do we have to apply to the cart for it to move at a ...
- 107
0
votes
1
answer
170
views
What happens if you ride a bike on to a moving sidewalk?
If a person were to riding a bicycle on normal ground then ride onto a conveyer moving in the forward direction of the bicycle (like a moving sidewalk in an airport), would the bike slow down or speed ...
- 111
5
votes
3
answers
1k
views
Is polar coordinates frame non-inertial?
Consider the acceleration expressed in polar coordinates.
$
\left( \ddot r - r\dot\varphi^2 \right) \hat{\mathbf r} + \left( r\ddot\varphi + 2\dot r \dot\varphi \right) \hat{\boldsymbol{\varphi}} \...
- 2,617
4
votes
2
answers
1k
views
Find the relation between length of pulley and strings [closed]
A pulley is pulled with external force $F$. $x$ and $y$ denote the displacement of two ends of strings of the pulley and $z$ is the displacement of the pulley.
Prove That $$z = \dfrac{x+y}{2}$$...
- 252