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Gravity
One of the four fundamental interactions, gravity is responsible for the fact that any objects with mass attract one another. According to general relativity, it is a space time curvature, but according to quantum mechanics it is the result of exchanges of virtual gravitons.
4,784 Questions
What is the purpose of gravity?
Gravity is a fundamental force of nature that attracts objects with mass towards one another. Its purpose is to create a stable environment by keeping astronomical bodies in their orbits, allowing planets to revolve around stars and creating the structure of galaxies. It also enables life on Earth by keeping our atmosphere in place and regulating the movement of tides.
Mass
Is the fulcrum point on a forklift a vertical line through the middle of the center of gravity?
No, the fulcrum point on a forklift is typically the front wheels, while the center of gravity is higher up near the load. This arrangement allows the forklift to balance and lift loads efficiently.
A 5 kg book falls from a shelf. If it lands with a speed of 5.7 ms from what height did it fall?
Here is one way to solve it:* Calculate the kinetic energy related to this speed.
* Assume that no mechanical energy was lost; i.e., calculate the height required to get the same gravitational potential energy. That is, write the equation for gravitational potential energy, replace the numbers you know (including the energy you just calculated in the previous point), and calculate the height.
Note that the result does not depend on the mass of the falling object.
It would weigh about one sixth (1/6) as much as it does on earth - as the moon's gravity is about one sixth as it is here.
What are the two factors that affect the gravitational pull of a palnet?
Gravity is the attraction between two or more bodies. It is propotional to their mass and inversely proportional to their distance.
What is the force of gravity on a 3500 g of an object?
You can convert that to kilograms (reminder: 1 kg = 1000 grams); then multiply by the value of the gravitational field, which near Earth's surface is about 9.8 newton/kilogram. This will give you the weight in newton.
Would an object have a greater gravitational pull closer or farther from earth?
An object have greater gravitational pull closer from earth. As we get farther from earth, the gravitational pull becomes weaker. That is why objects sufficiently away from the earth do not fall on it.
Which falls faster 1 lb of lead or 1 lb of feathers?
Since lead is heavier, one would think it would fall faster. But, in fact, both will fall at the same speed. Earth's gravitational force directly depends on the mass (F=mg). Since their mass is equal (1 lb), both would be pulled by the equal quantity of force and hence fall at the same speed.
Why is there less mass on mars than the earth?
Mars has less mass because it is a smaller planet that is made up of roughly similar matter.
The mass is the same everywhere. It is the weight that could be different according the difference in gravity among the planets.
What is the weight of an object due to gravity whose mass is 17.6 g?
The weight of an object is the force exerted on it by gravity. The weight of an object with a mass of 17.6 g can be calculated using the formula: weight = mass x acceleration due to gravity. Assuming Earth's gravity (9.81 m/s^2), the weight would be approximately 0.173 Newtons.
We know that there is a singularity at the heart of a black hole based on observation and calculation, but it is also known that things don't fall throught it. Instead, objects fall into it and can't escape, due to the large amount of gravity produced by the singularity.
Why does the front wind screen of a moving car get wet when rain is falling vertically downward?
-- A raindrop takes some time to fall through a distance equal to the
height of the windscreen.
-- In that length of time, the car moves some distance forward.
-- Any raindrop that is directly in front of the windscreen, but nearer
to it than the distance the car will move before the raindrop falls past
the bottom of the windscreen, will splat against the windscreen as its
fall is interrupted.
What is the mass of a child if the force of gravity on the child's body is 100 N?
If the child weighs 100 N on Earth, then his mass is about 10.2 kilograms.
What happen to gravitational pull of Earth if mass of the object increase or decrease?
The FORCE, or Gravitational Pull of the Earth on an Object is DIRECTLY PROPORTIONAL to the Object's Mass.
Force = Mass x Acceleration of Gravity
So, if Mass goes up, Pull goes up, If the Mass goes down, the Pull goes down.
Are we still researching gravity today?
Yes, gravity is still not fully understood. One theory still being researched is the existence of a particle called the graviton which could be the cause of gravitational attraction between bodies.
The sole hold-out in the Grand Unification Theory is Gravity. Einstein tried to solve it and failed.
What is the value of acceleration due to gravity at pole of the earth?
Answer #1:
9.8 m/s2
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Answer #2:
The apparent variation in gravity at different places on Earth is the result of a
combination of two causes. One of them is real ... Earth's greater radius to the
poles than to the equator. The other one ... the so-called 'centrifugal force' due
to the Earth's rotation ... doesn't change gravity, but appears to create a force
that acts in a direction different from gravity and thus partially counteracts it.
I won't go into a lot of detail on the subject of centrifugal force here, except
to just mention that no such force exists and I really hate it when people talk
about it as if it does.
I tried to find a source on the internet that differentiates between these two
causes, so that I could give you the real, actual difference in gravity between
the equator and the poles. But my exhaustive 5-minute search produced only
a source that lists the total apparent gravity as a function of latitude, which
includes both effects. So I guess I can strictly answer your question, because
the apparent gravity at the poles is not affected by any so-called 'centrifugal'
component, but the figure I have for apparent gravity at the equator does
include the full effect of that hideously popular nonexistent force.
The value of acceleration due to gravity at Earth's poles is 9.832 m/s2 .
The apparent value of acceleration due to gravity at Earth's equator is 9.780 m/s2 .
The difference is about 1/2 of 1 percent ... the difference between 199 pounds and 200 pounds
when the same mass is weighed in both locations.
What is the center of gravity of the body?
The human body is bilatertally symmetrical because the left and right halves of the body mirror each other, as you can see in the image to the left.as such the centre of mass of the human body should lie in its geometrical centre of the body
In most people the center of mass is around the belt buckle andabout 4" in. A Japanese martial arts instructor could be used to show you where the "hara" is. This approximately the same location.
How far does water travel vertical through wood?
it depends on the grain of the wood and the thickness however standard un waxed or treated wood, it would take several hours for the water to travel vertical through the wood. however another factor would consist of the amount of water as well.
What is the equation thast describes how air resistance affects terminal velocity?
down and up forces balance at terminal velocity
mass * g = v^2 * drag coefficient
if mass and terminal velocity are known , drag coefficient can be found
say mass = 100 kg, g = 9.8 (m/s)/s, terminal velocity = 70 m/s
so at terminal velocity:
100*9.8=4900* drag coefficient
then:
100*9.8/4900 = 0.2 (drag coefficient)
if you reduce the drag coefficient, the terminal velocity will increase, until the forces balance
Why is pepper lighter than salt?
It is not. An ounce (or gram) of salt weighs the same as an ounce (or gram) of pepper.
However, the density of salt is more than the density of pepper. Thefore the volume of one onunce (or gram) of pepper will be greater than the volume of one ounce (or gram) of salt.
How Does Gravity Affect the Suns movement?
Actually the gravity cannot affect the suns movement. But without gravity,
every planet would stop orbiting and sail off out of here in a straight line.
How does gravity affect the other planets in the solar system?
"Gravity" is responsible for the existence of planetary orbits, and for their shapes
and periods. It's also the reason for the spherical shapes of the planets, and for
the existence of atmospheres, in the case of those planets that have any.
