Mechanics

The formula for the force of friction is Ff=μFn Where Ff is force friction; μ is the coefficient of friction; and Fn is Force Normal (The force that a surface pushes back on a object)

Force normal is equal to gravity times mass since the object is not falling or accelerating upwards.

Therefore your formula can be manipulated to:

Ff=μmg Where m is mass; and g is gravity (9.81)

Substitute your variables, therefore you get:

500N=μ(200kg)(9.81)

μ=0.254841998

water used to brake

21 knots is 24.17 mph

It's static because the major cause of rolling friction is deformation of both roll and surface it's moving on - surfaces do not slide on each other(at any given instant the relative velocity of point on the roll that touches surface and surface itself is zero - at least in the model). The deformation causes the point of contact to be slightly displaced in front of the moving roll and reaction force at this point plus weight of the rolling object are no longer on the same line. This introduces torque that opposes the rotation of the roll. Rolling friction is essentially static friction because the point of the wheel in contact with the ground does not slide against it, but instead maintains its position. If enough static friction does not exist and the wheel slips against the ground, motion will not be proper. Sliding friction will however be taken into account in that case.

Yes,there is relation between them because a body cannot work without energy

a lever is used for helping people work with things.

a uniaxial force is a force applied only in one direction - directly in the axis direction

Glass doesn't explode for no reason. If glass shatters, then it was either hit with something, or it's resonating frequency was attained and held long enough for the glass to vibrate itself apart.

It becomes a lower frequency.

Because the shape of the earth is not a perfect sphere, in which each of the point is on the same distance from the mid point . It is oval in shape so all the points are not on the same distance from the core and thus is varies near equator and the poles.

No, acceleration is change in velocity. (And velocity is speed in a certain direction.)

If an object slows down, then it is changing velocity and thus accelerating. (In this case, the acceleration is negative.)

If an object changes direction, then it's velocity changes, so this is also acceleration. (This is centripetal acceleration.)

mechanical friction is when two mechanics create friction

Depending on the properties of both material and surface it hits, the collision may be elastic, inelastic or anywhere in between.

In either case, a portion(0 to 100%) of momentum is transferred to the ground and the rest remains in body(ie. it bounces).

The screw could be described just this way. A helical angle, a screw has a helical angle, roll the object on white paper one revolution the indent or marks will show the incline, helical angle.

Three forces in equilibrium can be represented in magnitude and direction by the three sides of a triangle taken in order. If a number of forces acting simultaneously on a particle be represented in magnitude and direction by the sides of a polygon taken in order, their resultant may be represented in magnitude and direction by the closing side of the polygon taken in opposite order.

When rolling down, potential energy is converted into kinetic energy. If there is no friction, this means the skater moves faster and faster. If there is energy (the usual situation), part of this movement energy (kinetic energy) will be converted into heat.

No.

This is shown as far back as Galileo's dropping of different weights out of the Leaning Tower of Pisa, where each weight reached the ground the same time.

This is because the acceleration due to gravity is constant (9.81 m/s^2) on Earth, so all objects increase in velocity at the same rate regardless of mass.

true -apex

I think the answer might be yes. With out a doubt most would say that only uneducated or extremely dumb people would think that heavier objects fall faster since nowadays it is taught over and over in our public schools that everything falls at the same rate. This being said, however, I remember once reading an article over gravity that disputed the common idea of everything falling at the same rate. The problem with running tests on earth is the sheer massivness of its gravitational pull. Compare the two objects being tested... lets say a marble and a bowling ball... and pit them against the macro scale size of the Earth. By comparison the two objects are virtually the same size and therefore appear to fall at the same rate! The difference of the time of thier fall is so negligible that there is practically no difference at all. One has to look at the Earth as an object also, however, and note that it too is falling toward the objects being dropped... though the force the two objects exert on the Earth is miniscule. Imagine though another Earth sized object being dropped on the Earth! Then the objects would fall toward eachother and be essentially falling from both ends which would in fact reduce the time it took them to meet. People tend to forget that everything is relative to thier perspective. The more massive the object being dropped the more pull it has on the object it is being pulled to, making the object it is falling toward meet it somewhere in the middle. It is true that Earth pulls on everything the same... but not everything pulls on the Earth the same. The difference of the pull on the Earth exerted by the objects being tested is so puny that it is disregarded and for all practical purposes and people say that things fall at the same rate. To me, this is a disgusting perversion of the truth. It would be the equivalent to comparing the speed of cars to the speed of light and saying that all cars travel at the same speed regardless of make, model, or year.

- 48daniel

A jar lid is typically considered a screw or lever simple machine. The twisting motion used to tighten or loosen the lid acts similar to a screw, while the leverage from the lid helps to create a tighter seal on the jar.

If a ball slides down a frictionless hill there will be no rotation of the ball. But with friction the ball will both translate and rotate down the hill.

that would be static friction. Static friction is the maximum amount of force that you can apply to an object before it moves.

hope this helped!

To be sure, many wave functions have singularities. In general, the wave equation has two families of independent solutions. One of those families exhibits no singularities. The other does, that is, it becomes unbounded or infinite at a particular point in space or time. The wave equation in a spherical coordinate system is a well understood and classic example. Along the radial coordinate, the solutions are Bessel Functions. There are two well studied familes of solutions. The J-Bessel Functions are well behaved everywhere, that is, they do not exhibit singularities. In contrast, the Y-Bessel function has a singularity at the origin or the coordinate system. The J and Y Bessel functions may be superimposed to form traveling waves. Depending upon how they are combined, the waves may travel away from the origin or towards the origin. There are many other coordinate systems besides the spherical one. They all have wave functions with and without singularities. If one of the coordinate systems conforms to our notion of the shape of the universe, then, with suitable boundary conditions, a singularity at the origin of time and space does indeed give rise to wave functions.

A stove is not typically classified as a compound machine; it is primarily a single machine designed for cooking. However, some stoves may incorporate multiple components, such as burners, ovens, and controls, which work together. While these components can be seen as individual simple machines, the overall stove is generally considered a complete appliance rather than a compound machine.

Go to the download section of the vestal website

http://www.vestalwatch.com/#/Downloads/

You can download the manual for G5 G7 and G9 watches.

Note on my G5 the EL/SET and RESET buttons are the opposite way to those shown in the instruction manual

You can also request a PDF of the instruction manual by emailing info@vestalwatch.com

work,velocity,force and acceleration