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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 do you call the force of gravity that causes things to orbit?
-- Without gravity, there would be no orbits.
-- Gravity bends the motion of a planet into a curve. Without gravity, the planet
would continue in a straight line, and there would be no orbits.
-- Once you completely understand gravity, you can figure out everything there is
to know about orbits, because it all comes from the behavior of gravity.
Is gravity a force of erosion?
Gravity is an agent of erosion... I'm not quite sure if it is erosion. In the science textbook I have right in front of me it says and I quote, "Gravity, running water, waves, wind and glaciers are all causes, or agents, of erosion. Although it says it's an agent of erosion it doesn't say it is erosion. An agent is a "cause" of something.
Where on earth is the pull of gravity the least?
The pull of gravity depends on the mass of the two objects attracted to one another, and the distance between them. The greater the distance between the two objects, the weaker the pull of gravity. For that reason gravity is strongest at low elevations (closer to the center of mass of the earth) and weakest at high ones (farther from the center of mass), although the difference is essentially impossible to notice.
How do you manage the lack of gravity in space?
You don't need gravity to survive, at least not in the short term.
The lack of gravity is a problem in the long term, though: Muscle and bone gets weaker - the body finds that it doesn't actually need all this muscle and bone when there is no gravity to fight, so it gets rid of it.
NASA is doing research on how to avoid this, for longer trips in the future. See for example related link on "pillownauts".
A cave that has collapsed because of gravity?
Caldera - if the collapse is into a volcanoe's magma chamber.
If into a limestone cave its is a shake-hole or sink-hole. (I think that may be a US / UK respectively, name division for the same feature.)
What is the change in the way a plant grows in response to gravity?
Plants are negatively geotropic, and grow away from gravity. Since the earth is the center of gravity as far as plants are concerned (not to mention us humans!), this of course means that plants grow away from the earth. This is because plants seek out sunlight, or whichever light they are being exposed to. The photons (light energy) make contact with the plants surface and results in the creation of a hormone known as auxin which causes cell elongation. Since this happens on the side exposed to the light, a plant regardless of it's position, will begin to angle towards the light. So if for instance you placed a light shining downwards and a plant upside down, the plant would grow 'backwards' so to speak and away from the earth and the source of gravity.
What is gravity and how does it affect earth?
Gravity is a force that pulls objects with mass towards each other. On Earth, gravity is what keeps everything grounded and causes objects to fall towards the ground when dropped. It also determines the weight of objects on Earth because it is responsible for the force that keeps us and everything else on the planet in place.
Does earth's gravity pull on everything?
Yes, anything that get's within a close range of the earth will be pulled on by earth's gravity.
What is the shape of ice cube at zero gravity?
At zero gravity (or the microgravity environment of the International Space Station) the high surface tension of a water droplet would pull it into a sphere. If left undisturbed (no waves of motion to distort its basic shape) and allowed to freeze while not in contact with the any of the walls of its container, it would form a near-perfect ice sphere.
However, that same surface tension would, if it came into contact with one of the freezer's walls, cause it to stick: resulting in a part-curved, part-flattened lump that would need to be scraped or pried away.
What pull of the gravity on seawater causes?
The pull of gravity on sea water is from the moon. This causes tides. Like when you are at the beach low tides and high tides occur right? So, the moon pulls on the earth and the water follows the moon's gravitational pull. Hope this helped:)
What are the three types of pressure that can push against the inward force of gravity?
The three types of pressure that can push against the inward force of gravity are thermal pressure (due to high temperatures), radiation pressure (from electromagnetic radiation), and degeneracy pressure (resulting from quantum effects in dense matter).
Why does earth have the most amount of gravity?
The amout of gravity is directly related to the mass of the body, since the earth has more mass it also has more gravity than the moon just like Jupiter has more mass than earth so it has more gravity.
What factors affect the speed at which objects move through water?
The speed at which objects move through water is affected by several factors, including the shape and size of the object, the density and viscosity of the water, and the presence of any obstacles or currents that may impede its movement. Additionally, the force exerted on the object and the surface area in contact with the water also play a role in determining its speed.
How thick is the earth's gravity field?
Earth's gravitational field extends to infinity.
No matter how far you are from the earth, It's gravitational field will always pull you towards it. However, the further you are from the earth, the weaker that force will be.
Erosion caused by gravity, also known as gravitational erosion, occurs when the force of gravity pulls materials downslope, causing them to be transported and eroded. Examples include rockfalls, landslides, and creep. Over time, these processes can shape landscapes and contribute to the movement of sediment and soil.
How does the gravitational pull of the moon and the sun cause spring and neap tides?
When the Moon and the Sun are on the same side of the Earth, or on opposite sides of the Earth (i.e., full moon or new moon), their effects are in the same direction, and the tides are stronger (spring tides). When they are at right angles, their effects will partially cancel, and the tides are weaker (neap tides - not sure about the spelling).
It doesn't have enough gravity to have an atmosphere?
The moon is one of the heavenly bodies that do not have gravity and hence lack atmosphere. It is also worth noting that the moon does not emit light of its own but rather reflects the sun's light.
Which planet has the strongest gravity and why?
Jupiter has the strongest gravity among the planets in our solar system. This is because Jupiter is the largest planet, and its mass creates a stronger gravitational pull compared to the other planets.
What is a plants response to gravity?
Plants use gravity to help determine the direction in which to grow their roots and stems. This response is known as gravitropism - roots grow downward with gravity, while stems grow upward against gravity, a process mediated by plant hormones called auxins.
Why cannot gravity be detected with instruments?
Gravity can be detected, provided the system used was not calibrated in a major gravitational field. It involves placing a known mass in a vacuum chamber and dropping, then recording the time it took to get from top to bottom. Using kinematics we can calculate the gravitational force and therefore the gravity at that point in space.
How is the force you apply by pushing on a rock different from the force of gravity on the rock?
The force you apply by pushing on a rock is due to your muscles exerting force directly on the rock, known as external force. This force is a contact force that can vary in strength and direction. Gravity, on the other hand, is a constant force pulling the rock downward towards the Earth, known as a non-contact force.
What is the maximum recession velocity of the galaxy observed?
Some of the furthest galaxies are believed to be "travelling" faster than the speed of light.
They are not actually "travelling" faster than the speed of light, but creating space, faster than the speed of light.
What is the impact velocity of a rock thrown at 8ms from 100m cliff?
For these calculations, air resistance is neglected and acceleration due to
gravity is assumed to be -9.8 m/s2. It is assumed the the rock was thrown horizontally.
Velocity is a vector, with an x component and a y component. The x component will not change, so the x component at the point of impact will be 8 m/s. The y component of the velocity is initially zero, and the acceleration is -9.8 m/s2. The final y component of the velocity can be found using the formula
vy2 = v0y2 + 2(a)(h)
so vy2 = 2(-9.8)(-100), so vy is 44.3. The x and y components of the velocity vectors now need to be put to together using the Pythagorean theorem. So
v2 = 44.32 + 82 so the final velocity is 45.02 m/s. The angle relative to the ground can be found using the tangent. tan-1(44.3/8), which is 79.8 degrees.
What is the impact velocity of a rock thrown horizontaly from a cilff?
The impact velocity of a rock thrown horizontal from a cliff depends on two things, the initial speed of the rock (vi) and the height of the cliff (h). The final velocity (impact velocity) is represented by vf
For this formula, air resistance is neglected, and acceleration due to gravity is assumed to be 9.8 m/s2. The acceleration is positive here because down is being treated as the positive direction. You will get the same result if you use negative 9.8 m/s2 and make the height negative. sqr() means square root.
vf = sqr(19.6h + vi2)
For example if the rock was thrown off a 3 meter high cliff at 20 m/s, the impact velocity would be sqr(19.6 x 3 + 202), which would be sqr(58.8 + 202), which would be 21.42 m/s.
The angle relative to the ground is the inverse tangent of sqr(19.6h)/vi
which in this case is tan-1( sqr(19.6 x 3)/20), which is tan-1(7.67/20) which is 21.0 degrees.
Who invented that there is gravity on the earth?
Gravity was not invented, it was discovered by Isaac Newton.
