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Apr
22
comment Tension and friction. Cool question
You might want to mention that contact forces act in equal and opposite fashion on contacting bodies.
Apr
22
comment May a point rotate about itself?
Please accept whichever answer was most helpful to you.
Apr
22
comment May a point rotate about itself?
@lucas, Why? Why do points need rotations. To have rotation you need a definition of an orientation. What is the orientation of a point? Also, a location plus orientation is already called a coordinate frame.
Apr
21
comment May a point rotate about itself?
$0·\infty$ can be anything. Usually we know $v$ and $\omega$ and we calculate $r$. If $\omega=0$ then $r=\infty$.
Apr
21
comment May a point rotate about itself?
You understand the linear velocities are a vector field. They change value as a function of position. So only at the central axis the value matches between the two cases.
Apr
21
comment Friction of a scissor
The coefficient of friction is a material property and does not change with geometry. The amount of frictional force changes. Is that what you are asking about?
Apr
21
reviewed Approve Friction of a scissor
Apr
21
answered May a point rotate about itself?
Apr
21
comment Rolling without slipping taking the contact point as pivot
Think of the friction force as a function of slip velocity. When slipping is zero friction is zero, otherwise friction acts in a way to minimize slipping.
Apr
21
comment Question about Thrust; am I correct?
The above is an application of the product rule we learned in calculus.
Apr
21
answered “Sweet Spot” of Rod-Pendulum - Problem Clarification
Apr
21
answered Why does the angular speed formula end up in radians per second?
Apr
21
comment Why does the angular speed formula end up in radians per second?
can u show us your calculation?
Apr
20
comment What is the minimal G-force curve in 2-dimensional space?
No it is a conceptual proof. Having (flat) constant lateral acceleration is better than any curve which is limited in its maximum value. It is like the area under a curve is always smaller than the area of a rectangle encompassing the curve.
Apr
20
comment Rotation of rigid body with two different angular velocities
Equation on a non-inertial frame do not make sense. I always look at things on inertial frames, just at different locations or with different modeling choices (absolute vs. relative motion).
Apr
20
revised What is the minimal G-force curve in 2-dimensional space?
added 1787 characters in body
Apr
20
answered What is the minimal G-force curve in 2-dimensional space?
Apr
20
comment What is the minimal G-force curve in 2-dimensional space?
Possible duplicate of non-accepted answer physics.stackexchange.com/a/185261/392
Apr
20
answered Rotation of rigid body with two different angular velocities
Apr
20
comment Rotation of rigid body with two different angular velocities
Is $\omega$ the joint velocity (relative) or the absolute velocity of the cylinder?