Gravity

1). The force of gravity attracts you downward.

2). The floor of the elevator car exerts an upward force on the bottom of your feet.

When #1 is greater than #2, you accelerate downward, and you feel lighter than

normal. That happens when the car is starting to go down, or finishing going up.

When #2 is greater than #1, you accelerate upward, and you feel heavier than

normal. That happens when the car is starting to go up, or finishing going down.

When #1 and #2 are equal, you don't accelerate at all, and your weight feels

normal. That happens when the car is standing still, or rising at a steady speed,

or dropping at a steady speed.

a=(g(m1+m2))/d^2

in case 1 , say g =10 m1 = 1 m2 = 1 d = 1

then a = 20

in case 2, g = 10 m1 = 2 m2 = 2 d = 2

then a = 10

the acceleration is halved , but the force remains the same (f=ma)

A ball falls down due to the force of gravity acting on it, pulling it towards the center of the Earth. This force causes objects to accelerate towards the ground at a rate of 9.8 m/s^2.

Yes, dwarf planets have gravity just like any other astronomical body. Gravity is a fundamental force that exists due to the mass of an object, so all objects with mass, including dwarf planets, have their own gravitational pull.

If the object that falls is sufficiently dense and streamlined, so that the effects

of air resistance can be neglected, then you can estimate the height from which

it fell like this:

-- Time the fall, from the instant the object is released until the instant it hits the ground.

-- The distance it fell is [ 16.1 T2 ] feet, or [ 4.9 T2 ] meters.

The height of a tall building can easily be measured by using a barometer.

There are two convenient methods.

1). Drop the barometer from the roof of the building. Time its fall, from the

instant the barometer is released until the instant it hits the ground. The

height of the building roof is [ 16.1 T2 ] feet, or [ 4.9 T2 ] meters.

2). Tie the barometer to the end of a long tape-measure or rope. With the

barometer as a weight to resist the inaccuracy that would be introduced by

the wind, slowly pay out the tape or the rope from the edge of the building's

roof, until the barometer just touches the ground. At that point, either read

the height directly from the tape, or mark the rope where it touches the roof,

and measure the length of rope between the barometer and the mark later.

Weight is the term defined as a measure of the pull of gravity on an object. It is the force exerted by gravity on an object and is typically measured in units like pounds or kilograms.

Gravity affects your car speed when you are driving on a hill. When going uphill, gravity acts against the car's momentum, causing it to slow down unless the engine compensates with more power. When going downhill, gravity assists the car's momentum, causing it to speed up unless the brakes are used to control the speed.

Gravity is a short e

Smdh-Emely, Bonet

Some common causes of failure of a gravity dam include inadequate foundation design or construction, overtopping due to excessive inflow or inadequate spillway capacity, seismic events, internal erosion leading to piping or seepage, and poor maintenance or aging of the structure. Regular inspections and proper monitoring can help to identify potential issues and prevent failure.

I would add that gravity, as we now understand it, results from the curvature of spacetime as caused by mass. This curvature ends up being interpreted in everyday life as a gravitational field strength. This gravitational field causes other masses to accelerate. So while a universe with only 1 mass would have no gravitational force, there would be curvature so there would be, effectively, a field--just nothing to interact with the field.

9.81 is the acceleration due to the force of gravity experienced by bodies on or about the surface of the earth (nominally at sea level) the units are meters per second / per second, that is to say a stone dropped from a height will gain 9.81 m/s velocity for every second it falls (is in freefall)

however , if you move from the earths surface , this figure will diminish, an example being : if you double your distance from the earths centre you will experience 1/4 of the acceleration (or force) you experienced at the surface

If its mass is 0.6 g and its volume is 1 cm3 , then its density is 0.6 g per cm3 .

The stone would fall straight down from the release point, it would fall with steadily

increasing speed, and when it hit the ground, it would stop falling. The rate at which

its speed increased during the fall would be 32.2 feet per second faster every second.

In the British system, the force due to gravity is typically measured in pounds-force (lbf). The force due to gravity on Earth is commonly approximated as 32.2 lbf. This means that a 1-pound mass would experience a force of 32.2 lbf due to gravity.

If you mean what is gravity then it's the characteristic of space that causes

a pair of forces between you and center of a planet, for example earth. this

is what causes how much you weigh, which is also why you weigh less on

the moon.

This is a pretty deep question, and it is what prompted Albert Einstein to formulate his theory of general relativity.

The basic is the so-called equivalence principle, that acceleration and gravity are the same. Einstein became to understand that there is no local way to distinguish gravity from uniform acceleration.

A thought experiment would be you inside a closed up room. Without any way to look or detect anything outside the room you will not be able to distinguish whether the room is inside a gravitational field or uniformly accelerating. No experiment that can be carried out locally can make the distinction either.

As such gravity and acceleration has to be the same. In fact acceleration inherits all the hallmarks from gravity, including gravitational time dilatation!

If you are in a lift (elevator) moving at constant speed, whether up or down,

and you have no visual contact with the outside, then you don't know that

the lift is moving, and no physical experiment can detect the motion. Your

apparent weight is the same as when you're at 'rest'.

The total time of flight for a ball thrown vertically upwards and returning to its starting point is twice the time taken to reach maximum height. Therefore, the time taken to reach maximum height is 4 seconds. Given that the acceleration due to gravity is -9.8 m/s^2, using the kinematic equation v = u + at, where v is the final velocity (0 m/s at maximum height), u is the initial velocity, a is the acceleration due to gravity, and t is the time, you can solve for the initial velocity. Substituting the values, u = 9.8 * 4 = 39.2 m/s. Therefore, the initial velocity of the ball thrown vertically upward is 39.2 m/s.

gravity is force of attraction that exists between masses , the earth being one (large ) mass , and you , another. Just by standing on the earth the soles of your feet will register the force of attraction between you, although you can overcome the entire earths gravity by(for instance) climbing some stairs.

Although the earths gravity diminishes the further you get away from it, you have to travel a good distance away before you notice the difference, so in practical terms the earths gravity remains constant and about the earths surface will produce an acceleration towards its centre of about 9.8((m/s)/s), that is to say if you drop a stone from a tower its velocity increase will be 9.8m/s over each one second interval, for example:

time from drop(s) velocity(m/s)

0 ----------------------0

1 ----------------------9.8

2 ---------------------19.6

3 ---------------------29.4

see also equation : force = mass * acceleration (issac newton)

so essentially if you apply a constant force (in this case, gravity ) to a mass (stone ), it will gain speed (accelerate) uniformly

When you throw a ball, your hand applies force to the ball. The force propels the ball forward, giving it speed and direction.

Yes, the formula for gravity is given by Newton's law of universal gravitation: F=G*(m1*m2)/r^2, where F is the force of gravity, G is the gravitational constant, m1 and m2 are the masses of the two objects, and r is the distance between their centers.

relative density compared to water, water density = 1000 kg/m^3 , sg = 1

say density of oil = 850 kg/m^3 , then sg = 850/1000 = 0.85

say density of steel = 7850kg/m^3 then sg = 7850/1000 = 7.85