Gravity

Mobile devices typically use an accelerometer as a gravity sensor. An accelerometer measures the device's acceleration and orientation in relation to the Earth's gravity. This sensor is used for various functions, such as screen orientation, motion detection, and gaming applications.

No. The gravity of an object is directly proportional to its mass, meaning if you double the mass you double the gravity. Earth has more mass than a car does by an unimaginably large margin.

Common sense also says no. Objects very readily fall toward Earth. They do not readily fall toward cars.

Aristotle didn't use the word "acceleration," but he did state (incorrectly) that heavier bodies fell faster to the surface of the Earth than did lighter bodies.

The poet-philosopher Lucretius MAY have reached a different conclusion, but certainly did no experiments.

Writings prior to Galileo Galilei state that Aristotle had been shown to be wrong, but give no details.

Dutch scientist Simon Stevin did actual experiments in 1586 with dropped balls and proved conclusively that Aristotle was wrong. However, he also did not use the word "acceleration."

Galileo did a mathematical description of balls rolling down a plane, and showed that such bodies experienced constant acceleration. He then speculated that objects falling straight down would do the same. There is no credible evidence that he did any experiments on such objects, as he did not have the instruments to accurately measure their rate of falling.

The force of gravity on an object is commonly referred to as weight. It is the force exerted on an object due to gravity pulling it towards the center of the Earth.

Aristotle did the first recorded speculations on the nature of gravity.

Speculations by various philosophers continued for centuries.

By 1544, experimenters had shown that Aristotles speculations were false.

Galileo Galilei did the first mathematical description of gravity at the Earth's surface.

Isaac Newton showed that the same force (gravity) that caused objects to fall to the Earth also caused the planets to go around our Sun.

Albert Einstein showed that gravity was not EXACTLY a force between two masses (although that is a useful approximation) but a warping of space by each mass.

The density of the polymer will be very close to, usually a little under, 1, the density of the sponge will depend entirely upon how much polymer and how much space (air/bubbles) there is in it.

The attraction of the Earth for a kilogram of lead is equal in magnitude but opposite in direction to the attraction of kilogram of lead for the Earth, according to Newton's third law of motion. Both objects experience an equal gravitational force due to their masses.

Gravity is always attractive because it is a fundamental force of nature that causes objects with mass to be drawn towards each other. According to the theory of general relativity, gravity is the result of the curvature of spacetime caused by mass, leading to the attraction between objects. This attraction is what keeps planets in orbit around stars and holds galaxies together.

take g = 9.8 (m/s) /s

u=0

t=55 seconds

v=g*t = 9.8*55 = 539 m/s

this ignores air resistance, which would reduce this figure, typical freefall terminal velocity = 70 m/s

The answer lies in co-efficient of restitution. (COR) COR is the ratio of speeds before and after impact.

Normally, it is expected that the ball should reflect off the surface with the same speed with which it strikes. However, this happens only in the case of elastic collisions.

Elastic collisions are ideal collisions in which both momentum and kinetic energy are conserved. COR=1. In this case, the ball bounces as high as the height from where it was thrown.

In reality however, collisions are inelastic. COR<1. K.E is not conserved. Energy is lost in other forms like heat as a result of which the ball doesn't bounce as high.

Gravity acts as a barrier and slows it down. However, if you say, jump of a building. When you fall gravity will speed you up and you'll be dead fast. When you fall your speed is about 78mph. But that depends on the height of the building and wind direction.

The vehicle can overcome Earth's gravity using Newton's Third Law of Motion, which states that for every action, there is an equal and opposite reaction. By expelling gas with a force equal to the pull of gravity, the vehicle generates a thrust force that propels it upwards, counteracting the force of gravity pulling it down. This allows the vehicle to achieve lift-off and rise above the Earth's surface.

Yes. It keeps the planets in orbit around the Sun.

The movement of an object toward the Earth solely because of gravity is called free fall. In free fall, the object is only under the influence of gravity and experiencing no other forces that would slow it down.

It all comes down to mass.

The more mass an object has the greater it's gravitational force is.

Mass is the amount of matter or "stuff" an object has which we usually refer to as weight because it is being pulled down by the Earth. An object from Earth in space would have little to no weight yet have the same about of mass.

acceleration due to gravity (a) for any two bodies is given by:

a = (G*(m1+m2))d^2

G = 6.67 * 10^-11 (newtons gravitational constant)

m1=mass 1 (say earth @ 5.97*10^24)

m2=mass 2 (say you at 100kg)

d=distance between cog's

theres no "true" value ,because around the earth's surface it varies because d varies , the earth is not a perfect sphere

Reverse gravity is a term used in science fiction to describe a fictional scenario where the force of gravity is reversed, causing objects to fall upwards instead of downwards. In reality, gravity always pulls objects towards the center of mass, so reverse gravity does not exist in the natural world.

Solving for gravitational force exerted between two objects.

F = Gm1m2/r(square)

Note:

G is the universal gravitational constant

G = 6.6726 x 10-11N-m2/kg2

m1 is the mass of the 1st object

m2 is the mass of the second object and

r is the distance between the objects

No, objects with more mass do not necessarily descend faster when using a parachute. The rate of descent is influenced more by factors such as the size and design of the parachute, the air resistance, and the gravitational pull on the object.

No, only weight is affected by gravity: attraction, force, acceleration.

The weight of the bulb, acting downward, and the tension in the cord, acting

upward, must be equal, so that the net force on the bulb is zero. If not, then

the bulb is accelerating in the direction of the net force. If it's just hanging there

and not accelerating up or down, then the two forces must be equal, and add up

to zero.

Since you are in space, weighing them doesn't help you, because both of them

register zero on the bathroom scale.

You know that the box of metal parts has more mass, because it's heavier on

Earth. And the one with plastic parts has less mass, because it's lighter on Earth.

So you can perform an experiment to find out which box has more mass.

Since you are already in space, we can assume that you not only have the

physical attributes required of an astronaut, but that you are a hot-shot

intellectual as well, with a vast background in science and engineering. So

you know that [ F = M A ], and at last, you have a chance to use that arcane

knowledge!

You quickly solve Newton's equation for 'A' in your head, and get [ A = F/M ].

That tells you that when different masses are subjected to equal forces, their

acceleration is inversely proportional to their mass. The beauty of it in this

situation is that it's true anywhere, whether you're sitting on a planet or

floating in space.

So you quickly hang both identical boxes in the air in front of you, put one hand

against each box, put your back against the bulkhead, and push both boxes

with small, equal forces. The actual size of the force doesn't matter, as long as

the forces of both hands are equal.

Slowly the boxes begin to move away from you, and just as you had hoped, one

of them pulls out ahead of the other one almost immediately, and its lead keeps

building. That's obviously the one with greater acceleration, therefore less mass,

and therefore the one with the plastic parts inside.

You have no time to contemplate your discovery, however, because both boxes

are now beyond the end of your arms and still going, straight toward the two

guys in the flight-control seats at the other end of the flight deck, fast asleep in

their harnesses with their backs to you. You yell "FORE!", and then with rising

panic, try to figure out some way to arrest the sailing cargo crates. From your

vast astronaut training, you know it won't do you any good to push yourself off

the bulkhead and overtake them, because although you can easily overtake them,

you'll have no way to stop them once you get there.

You brought me aboard to help you identify the contents of the unmarked crates,

which I've done, and my work here is finished. I must leave now, and I hope you

figure out a way to get ahold of the crates and nail them down, before they go

through the window.

Good luck, champ. Have a nice day.