# Tag Info

## Hot answers tagged reference-frames

Accepted

### Can a non-inertial frame be viewed as an inertial frame?

Yes, this is often done in practice. For example, student lab exercises may study conservation of momentum treating the lab as an inertial frame despite the Coriolis force being present. The key is ...
• 104k
Accepted

### How do I know if a motion is 1 dimensional or 2 dimensional?

Let's say you have the following motion (the red arrow) It looks 2D on this plot, since its motion changes both the $x$- and $y$-coordinates. However, if you redefine the axes like so: Then the ...
• 21.4k

### How do I know if a motion is 1 dimensional or 2 dimensional?

Both you and your teacher can be correct depending on what you mean by "dimension." In everyday experience, we generally consider dimensionality to be the number of independent parameters ...
• 500

• 8,359

### Is angular velocity about any point in a rigid body always the same?

Doubt 1 It is measured about the axis of rotation. Doubt 2 Yes. For a rigid body all points will complete one revolution, $2\pi$ radians, about any axis of rotation in exactly the same amount of ...
• 74k

### Is angular velocity about any point in a rigid body always the same?

Each part of the rotating disk will have the same angular velocity. However, they will not all have the same tangential velocity (which will increase as you move further away from the axis of rotation)...
Accepted

### Why do objects in circular motion move outwards instead of inwards?

I think the "ultimate" reason for this behavior is Newton's First Law. Any material body will continue in a straight line at constant speed, except as acted upon by a force, which will ...
• 9,578

### Relative acceleration, mechanics

Perhaps it would help to think of relative displacement and relative velocity. Suppose m and M are on the table. Suppose M is at $x_M = -1 \space m$ and m is at $x_m = 2 \space m$. You can say what ...
• 41.4k
Accepted

• 74k
1 vote

### Centripetal force pointing outward

There is no force pushing you outwards. What you are experiencing is the effect of your own inertia. If you are in the left hand seat of a car turning a fast corner to the right, say, the inertia of ...
• 26.4k
1 vote

### Centripetal force pointing outward

What you feel in a rollercoaster as the carriage you are sitting in is pulling G's is that your body is compressed. Let me elaborate on what I mean here with compressed. Imagine a stack of, say, 10 ...
• 21.6k
1 vote

### Looking for clarification regarding equations describing uniformly accelerated motion in SR

Here is the short and sweet version. You are correct that conditions (ii) and (iii) are basically requesting you to construct the Rindler coordinate system. Show that coordinate stationary clocks ...
• 6,464
1 vote

### Moment of Inertia of cube about the axis along one of its diagonal

Consider a reference frame centred at the center of the cube with axes perpendicular to the opposite faces. Evidently the three moments of inertia are here identical. This means that the inertia ...
• 74.6k
1 vote

### How do I know if a motion is 1 dimensional or 2 dimensional?

the main thing take away: physics does not care a about your coordinates. So if the thing is moving on: $$\vec r(t) = t\cos{\theta}\hat e_1 +t\sin{\theta}\hat e_2$$ thats linear motion in a plane. ...
• 35.8k
1 vote

### Why do objects in circular motion move outwards instead of inwards?

When you swing a ball around in a circle, and suddenly cut the string, which way does it fly? Away from the circle. At any point during the circular orbit, the object has a tangential direction and ...
• 51.6k
1 vote

### Why do objects in circular motion move outwards instead of inwards?

The straightforward answer is that : It happened due to the inertia of the pen cap ( or any object moving in circle ). Let me explain: Say , there is body on a horizontal , uniformly rotating , rough ...
1 vote
Accepted

### Equilibrium when torque about the COM is zero?

Hope you are doing well. If a body is placed on a horizontal surface, the torque of the contact forces about the centre of mass should be zero to maintain the equilibrium. This may happen only if the ...

Only top scored, non community-wiki answers of a minimum length are eligible