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visits member for 3 years, 9 months
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Started programming on a ZX spectrum in the 80's and have moved through Assembly, Turbo Pascal, C++, C#, Fortran. My main area of focus is engineering and scientific computing like numerical methods and 3D graphics.


Aug
26
comment At the instant of release of an object from rest. Is the only force that can act its weight?
This question should not close as the OP has some confusion on how to apply the equations of motion.
Aug
26
comment At the instant of release of an object from rest. Is the only force that can act its weight?
Actually there is movement because AB goes from horizontal initially to vertical when $\omega = 2.4$
Aug
26
comment A triangle in static position
A guess won't cut it. Show us your work.
Aug
26
comment Topple a mass standing still
@Floris As far as the cm location, maybe that is what $x$ means in the OP. I asked about it and didn't get a satisfactory answer.
Aug
26
comment Topple a mass standing still
@Floris yes I should change the traction forces but since they don't enter into the torque balance it does not change anything. Also $N_2$ is included to show what happens when the box is not toppling.
Aug
26
comment Topple a mass standing still
It is not clear but the OP assumes a flat ground, without a corner at $x$.
Aug
26
comment Topple a mass standing still
See edits now. Maybe it is more clear. When a contact force goes to zero or negative the contact separates and the block tips.
Aug
26
revised Topple a mass standing still
added steps to solution
Aug
26
comment A statics problem to find minimal friction
Hint: The normal force is at an angle $\alpha$ from horizontal.
Aug
26
comment Topple a mass standing still
See answer now below.
Aug
26
answered Topple a mass standing still
Aug
26
comment Topple a mass standing still
Since the box remains flat, there is either 1 normal force and a reaction torque, or two normal forces at the corners. Using $x$ makes the problem harder.
Aug
26
comment Topple a mass standing still
What is $x$ above? It is measuring the horizontal separation of the edge to what?
Aug
25
comment In a 2-body problem, when is the moving path closed?
Given that the combined center of mass can be moving in a straight line, you have to be careful by what you mean "closed" path.
Aug
25
comment How can I calculate the center of an object relative to a focal point and a moving observer?
This question appears to be off-topic because it is about programming. Maybe it would be better served in Stack Overflow.
Aug
25
comment How can I calculate the center of an object relative to a focal point and a moving observer?
of course you mean perspective projection and not propsective projection
Aug
25
comment Which way to lean when driving a gokart?
The problem really depends on the non-linearity of pneumatic tires and suspension linkages. A general answer would involve deciding which configuration resulted in more even radial forces on the tires. a 50/50 dynamic weight distribution left to right is optimal.
Aug
25
answered The charm of the gyroscope
Aug
24
revised How can Excel be used to model the flight of a rocket?
added 2 characters in body
Aug
24
answered Forces as vectors in Newtonian mechanics