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Mechanics
Mechanics is the branch of physics that deals with the interactions of objects and forces in the observable world. Questions asking about projectile motion, conservation of energy, and calculus based mechanics are perfect for this topic, but questions about repairs that a mechanic would do belong in our vehicles categories.
2,416 Questions
Is 5 net force greater than -7 net force?
No , it is less than -7N force , Negative sign with a 7 N force tells us that it is acting in a direction opposite to that of motion of the body or ,.......
There is no specific type of torque. Torque is only the 'Circular' force that makes the body move in the circular path.
Which is better for focusing the sun's light at a point on the ground - a lens or a mirror?
The lens would be the easiest to handle for this purpose. Additionally, Lenses are cheaper, and easier to find.
72 meters
Why the pull up torque is less than starting torque?
at starting or initial stage there is no acceleration,it requires more force or power to move any body during initial stage,where as in running condition,it also requires some force or power whioch is less then the imitial power.hence the starting torque is always > pull up torque
What are balanced forces equivalent to?
A balanced group of forces has the same effect as no force at all.
Can you give you an investigatory project that has a relation about robotics?
An investigatory project that has a relation on robotics is an automated pancake maker. Another can be a robotic document filer.
Particles in a liquid move around just as freely as particles in a solid?
Solid: Locked in a crystaline structure, however they do vibrate slightly. Liquid: Particles are attracted to one another but can flow freely. Gas: Particles move with total freedom.
If you have two forces, one pointing in the positive x-direction with a magnitude fx and another one pointing in the positive y-direction with magnitude fy and there are only two dimensions (x and y) than the net force is a vector (fx, fy).
What affects the speed of a falling object?
The mass of a falling object will affect the speed at which it falls. Additionally, the shape or geometryof that object will also have an effect. The shape of a falling object will have a dramatic effect on the amount of dragthat the object will experience. Consider that a flat piece of cardboard will fall more slowly than a glass ball of the same mass, and it will be more easy to visualize how drag is a function of shape.
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Beulah the Buzzer gagged on the first sentence of the response above, and
Signor Galileo rotated 2pi in his crypt.
The mass of a falling object will NOT affect the speed at which it falls.
The remainder of the response above is correct and well stated, provided only
that the objects are falling through air. If not, then neither their shape nor their
geometry affects their rate of fall either.
Why no work is done when force is perpendicular to the body?
How can a force be perpendicular to a point?! Surely you wanted to ask "Why no work is done when force is perpendicular to the direction of the displacement of the body?". This finds a simple answer in the definition of work: work done by a force F is defined as
W := ∫ Fdr,
where r is the position of the particle (that is, of the point of the body the force acts on), and hence dr is the direction of the displacement of the particle. From the definition, you immediatly see that if the angle between F and dris 90° (or, in general, (2n + 1)π/2, with n element of Z) the scalar product is Fdr = 0, and thus W = ∫0 = 0.
Why is zero error not considered in spherometer?
No, you have not any knowledge about spherometer. In spherometer also, similar to other measuring instruments zero error should be considered every time; in order to achieve accurate value.
Yes. They simply could not get along, and the meeting
fell apart after just a few minutes.
How do you find the rpm if the radius is 29 ft and the centripetal force is 20 g?
20 g = 20 * 9.807 = 196.14 (m/s)/s
radius = 29 ft (uk) = 8.839 metres
circumference = 2 * pi * 8.839 = 55.54 metres
if:
a = v^2 / r
then:
v = sq. root (a * r)
v = 41.64 metres / sec
41.64/55.54 = 0.75 rev / sec
0.75 * 60 = 45 rev / min
How many forces are acting on hinged support?
Two, one in the vertical direction and the other in the horizontal direction
What are the units that friction is measured in?
The coefficient of friction is dimensionless; it has no units.
F=m*a
a=F/m = 300N/3000kg=0.1m/s^2
What is happening when you rub your finger around a glass rim?
Running a finger around the rim of a glass will "stimulate" the glass. We are adding energy to the glass, and because the finger tends to "slip and grab" as it moves around the rim, the energy is delivered in "pulses" to the glass. This tends to make the glass vibrate, and we are adding to the vibrational energy by continuously running our finger around the rim of the glass. The net result is that the glass will "sing" to us in a given pitch.
Some glasses lend themselves better to this experiment than others, and most stemware works quite well, even "cheaper" types. When doing an experiment, moistening the finger will help things. This is a good project to investigate some things in basic physics, though the principles at work may be a bit less than clear. The glass, like other objects, has a natural resonance, and we "tap into" that by mechanically stimulating the glass at the rim with our finger. When we find the glass beginning to vibrate, we can move our finger a bit faster or slower to add energy "in sync" with the vibrations, thus sustaining and increasing them.
What kind of friction allows you to walk without slipping?
Alternately, as we step: sliding, or dynamic friction; static friction; sliding friction again. Sequence repeats with each step.
