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Results tagged with newtonian-mechanics
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user 4272
Newtonian mechanics discusses the movement of classical bodies under the influence of forces by applying Newton’s three laws. For more general concepts, use [classical-mechanics]. For Newton’s description of gravity, use [newtonian-gravity].
1
vote
How does the tension in the clamp of a atwood machine equal twice the tension in the string?
Tension in the string is the work required to pull a unit length of
the string. So, when the tension is one pound, the reeling in of
a one inch length of string requires one inch-pound of work.
But …
- 10.2k
0
votes
Accepted
Force due to change in energy
For a dielectric being pulled into a high-E-field region, one cannot
make the usual 'E field is perpenducular to the parallel plates'
assumption, because the edge of the dielectric is a fringe region …
- 10.2k
3
votes
Which will require more force (kgf)? small or big scissors?
If this is about the force you must apply to cut paper, it depends on the
lever arm of the handle-pivot distance, and the lever arm of the pivot-paper distance. The handle of the larger scissors can …
- 10.2k
0
votes
Why can two skew forces not simplify to a single force?
There's two equations to be considered. First, is F = mA,
and there, you can add forces (because it's only one mass, and
only one real-world acceleration results). The second, though,
is torque = …
- 10.2k
2
votes
Accepted
How to prevent an asteroid from spinning while pushing it?
If the hypothetical asteroid is not spinning to begin with, yes, force
on the center of mass (for instance, gravity coupling of the 'tug'
craft with the asteroid) does not exert any torque, so will no …
- 10.2k
1
vote
A dielectric object moves past another in an electric field. How much of its movement energy...
A dielectric object in an electric field polarizes; exactly what its charge
distribution is, depends on the field and the shape of the object, and forms
a second-order differential equation to be solv …
- 10.2k
2
votes
A Force Perpendicular to the Velocity changes only the direction of motion?
The word 'perpendicular' indicates a force direction that neither adds to
nor subtracts from the forward momentum of the object in question.
That is where momentum change is only in direction, not mag …
- 10.2k
1
vote
Newton 3rd law confusion
Consider a sled with a load, being pushed on a level surface.
Exerting a force on the object, requires (as the object moves) that I
walk with it, else the moving object leaves my force-exerting hands
…
- 10.2k
0
votes
Accepted
Why is the time the same for an object thrown up with a non-zero initial velocity
It's a symmetric situation. Instead of looking at INITIAL velocity, recognize that the upward motion and downward motion are, point-for-point, mirror
images. The average upward velocity in the rise, …
- 10.2k
1
vote
Where does the force go? In which direction does the normal force act?
Force, unlike energy or mass, is not conserved. There is no cause
to suppose that a force 'goes' anywhere.
A force applied to a motionless chair can change its shape, and
alter the force applied by/ …
- 10.2k
1
vote
Does pressure exist at the center of a solid Sphere?
A solid, such as a sphere, is a statically indeterminate structure; it can
(often does) contain internal stresses, and those can be pressure in
the interior (or a variety of other conditions).
It is …
- 10.2k
0
votes
Presuure inside a current carrying wire
First, solve for the B field in the wire (if current is constant, the
current density will be uniform, and most wire is cylindrical).
Second, note that each element of the cross section is a wire, car …
- 10.2k
1
vote
Why are triangular orbits not possible in our universe?
A triangle has corners, three of 'em. At those corners, acceleration
must be high, to alter the direction of a moving object abruptly. So, there are three high-force (F= mA) events in each orbit. …
- 10.2k
0
votes
How does vibration transmitted through a horizontal surface cause the uniform rotary motion ...
Possibly the slight off-balance of the motor induces a circular wave on
the top surface? Otherwise, it could just be vibration causing
an interaction with asymmetry of the objects in motion.
Like yo …
- 10.2k
0
votes
Granular Material Piles on an Inclined Plane
The 'angle of repose' is the limit of stability for a granular pile.
A pile that takes on a conical shape according to the angle of repose, has
slumped into that shape.
Tilting the base under such a …
- 10.2k