# Tag Info

1 vote

### Why we can move forward in case of backward slipping?

The diagram shows a wheel rotating backwards and therefore skidding along the ground as it moves forwards. Because the wheel is skidding there is a frictional force equal to the friction coefficient ...
• 331k
Accepted

### Angular Acceleration of Spinning Body About a Rotating Axis

Let's first start with a picture. The object (blue ball) is rotating around the AB axis with angular velocity $\vec\omega_0$. Next, the $AB$ axis is rotating around the vertical with an angular ...
• 6,420

### Serious confusion regarding central concept of torque

One thing that might give you better intuition is that the definition of an angle is the ratio of 2 lengths: $$\theta = \frac{s}{r}$$ With $s$ being the arc length traveled along a circle, and $r$ the ...
• 2,499

### Serious confusion regarding central concept of torque

When you're using, for instance, $\vec{F}=m\vec{a}$, you have to specify the system you're applying it to: $\vec{a}=\alpha r\vec{e}_\theta$ is the acceleration of a single point of the rod, not of ...
• 2,256
1 vote

### Problems and trignometric generalities

$\vec v$ is perpendicular to the vector $\vec R$ from the center to the point where v is indicated. The vertical component of $\vec v$ is perpendicular to the horizontal line from the center to the ...
• 6,446

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