# Questions tagged [kinematics]

The description of the movement of bodies by their position, velocity, acceleration (and possibly higher time derivatives, such as, jerk) without concern for the underlying dynamics/forces/causes.

3,400 questions
Filter by
Sorted by
Tagged with
28 views

### Why does the bottommost point of a rolling body have a radial acceleration in the ground frame?

Let's say a solid cylinder of radius r is rolling on a stationary horizontal surface with linear velocity v, angular velocity $\omega$, linear acceleration a and angular acceleration $\alpha$ Bottom ...
51 views

### Simple physics question pls help [closed]

If two balls, A and B are projected with an angle from the same level but both reach same maximum height. The angle that Ball B makes with the horizontal line is greater than the angle that Ball A ...
27 views

### Is there a way to solve this question using instantaneous center method? [closed]

This question is about instantaneous center method of finding velocities. I saw this question on a exam paper, but i think the question may be wrong because i couldn't find a way to get IC(1,3) Or ...
23 views

### Are superconductors primarily for DC transmission?

I understand Superconductors can be beneficial due to their resistance to magnetic fields as in levitating bullet trains or MRI machines, but is our main interest for DC power distribution? I see ...
51 views

### Why is direction of train like this for car?

This is an image of a train and a car. T is the train moving towards - $x$ axis and C is the car moving towards $+ y$axis. So, my teacher made a resultant velocity with $-5\hat i$ and $-20\hat j$. ...
53 views

### What will happen to the ball in a vacuum container when suddenly the gravity after 2 seconds disappears? [closed]

Suppose that there is a ball in a vacuum container where mass of the ball is $2$ kg. The height of the container is $100$ m. Assume that the acceleration due to gravity is $10$ m per second square. I ...
29 views

### Is this correct regarding velocity of train?

So many yellow T drawn are just different position of train at different instants.The person is standing still at all those instants at one place. If a train is moving at 5m/s. Then for me , can we ...
28 views

### Direction of $V_RM$ confusion

So ,please read both the questions . They have similar originate questions that I am facing difficult in. Let us say rain is falling downwards with v = -5j and a man is moving with a velocity of 2i in ...
51 views

### Tension of string suspending a ball in Circular motion, given the mass of ball, radius and length of string [closed]

Ok so I have this question where a ball is suspended by an inextensible string and is caused to rotate in a horizontal circle which has its centre vertically below the point of suspension. What would ...
25 views

### Confusion in relative velocity with rain man problems

My major conceptual difficulty in understand this concept is mostly the direction of velocity of man with respect to rain. Let us say rain is falling downwards with v = -5j and a man is moving with a ...
273 views

### Does the SUVAT equations of motion (Kinematics) come from some differential equation?

Wikipedia says about the equations of motion that; "If the dynamics of a system is known, the equations are the solutions for the differential equations describing the motion of the dynamics.&...
81 views

### Why the direction of the omega (angular velocity vector) is along the axis of rotation? Also for angular acceleration

I know that the direction of omega is taken along the axis of rotation but I don't understand it why it is taken? I also know that $\mathbf v = \mathbf ω \times \mathbf r$ so, all three vectors ...
236 views

### Calculating displacement from acceleration (intuitively) [closed]

If I say acceleration of car is constant at $4\; \rm m/s^2$. Then isn’t it that it covers $4\; \rm m$ in $1\; \rm s$ with velocity $4\; \rm m/s$. Then in $2\; \rm s$, the velocity is $8\; \rm m/s$. ...
117 views

### Simple pendulum with moving support in a parabola

The problem says that I have to find the equations of motion in the Hamiltonian formulation for a simple pendulum with mass $m$ and lenght $l$, which its support moves with no friction along the ...
55 views

### What happens to the momentum of this rainfall? Are these expressions describing the rainfall correct/significant?

An element of mass $\Delta m_r$ (mass of rainfall) falls vertically onto a mass $m_c$ (a cart). The empty cart starts from rest and there is no friction. A constant horizontal force $F = <F, 0>$ ...
61 views

### How to use equation of motion like this here? [closed]

So I will explain my problem exactly what it is.Please do answer in such a format by telling me places where I am wrong from the text I write.I posted this question earlier also but I noticed many of ...
116 views

### Confusion in equation of integration and differentiation for motion?

It says displacement time equation here but x is position of particle here I think. It is not displacement of particle here. But when it is given velocity of particle to us and then we integrate it. ...
66 views

### Why quantities in physics are always talking about rates? [closed]

I get the idea that physics wishes to study changes to discover new rules. But why is everything related to rates? Acceleration,Velocity? Could we use something else apart from these? What can you ...
84 views

### Why does a body falling down follow this pattern of velocity?

I was wondering about the pattern of velocity for a body falling down with initial velocity $u= 0$ and $g = 10m/s^2$. Without using the formula , I thought : Velocity would change in this manner (...