how does gravity affect speed?

Answer 1

"Two forces act on a falling raindrop. The Earth's gravitational force is a downward acting force and the force exerted by the air (frictional
resistance) is an upward acting force.

Earth's gravity pulls objects downward at a constant rate, 9.8 meters per second each second ( 9.8 meters per second squared). The raindrop's fall will accelerate (or speed up) until the gravitational force is equal
to the force of the air pushing up against it. The net force on the
raindrop is then zero and according to Newton's second law, the drop stops accelerating and continues to fall at a constant speed. This speed is called the terminal velocity.

The terminal velocity depends on the size of the raindrop. Smaller droplets have lower terminal velocities. (The smallest drops, cloud droplets, are suspended in the atmosphere and do not fall.) The upward force exerted on the raindrop is proportional (directly related) to the cross-sectional area of the raindrop. If the raindrop is round,
then its area is given by the area of a sphere, ( (pi) times (the radius of the raindrop squared) ). The downward force is proprotional to the volume of the sphere, ( (4/3 pi) times (radius of the raindrop
cubed) ). For larger drops, the downward force changes more, at a cubic rate, while the upward force changes less, at a squared rate. The downward force on the raindrop is greater with larger raindrops.

In reality, raindrops are not round. The smallest cloud droplets are indeed spheres. Larger drops are distorted by the upward force and are essentially squashed as they fall, becoming flat on the bottom. A
great little book about raindrops and other stuff is From Raindrops to Volcanoes: Adventures in Sea Surface Meteorology by Duncan Blanchard. It is out of print but can be found in libraries and used book stores. "

Answer 2

gravity affects the speed of a body.for a freely falling object its speed will increase with time. for a constant gravity the speed of a freely falling body will linearly depend on the time. the graph between v-t for constant gravity will be a straight line. as the gravity increases the speed well also increase. but for the earth surface the value of gravity is fairly constant.

Answer 3

While moving towards earth or when going down a slope or while moving in a 'plain' speed increases; While moving away from the earth or when going up a slope speed decreases due to gravity if other things are kept constant

Answer 4

gravity affect speed:

1} . For movement along gravity direction in supported condition,
it increases the speed of effected object.

2] . For movement along gravity direction in non supported condition / opposite direction,
it decreases the speed of effected object.

Answer 5

In several ways; it depends on the context of that state also, for example if you were travelling uphill gravity will reduce speed and vice versa.
As gravity pulls you towards its source friction is also increased, which would also reduce speed.

Answer 6

Gravitation is a phenomenon through which all objects attract each other.Under normal moon-bound conditions, when objects move owing to a constant gravitational force a set of kinematical and dynamical equations describe the resultant trajectories. For example, Newton’s law of gravitation simplifies to F = mpg, where m is the mass of the body. This assumption is reasonable for objects falling to uranus over the relatively short vertical distances of our everyday experience, but is very much true over larger distances, such as spacecraft trajectories, because the acceleration close from the surface of the Moon will not in general be g. A further example is the expression that we use for the calculation of potential energy P.E. of a body at height h ( P.E. = mgh). This expression can be used only over small distances h from the Earth. Similarly the expression for the maximum height reached by a vertically projected body, h = u2 / 2g is useful for small heights and small initial velocities only. In case of large initial velocities we have to use the principle of conservation of energy to find the maximum height reached.

Answer 7

For a falling object, the stregth of gravity will tell how quickly or slowly an object will speed up.

Answer 8

if you think analytically, gravity reduces the speed

Answer 9

in both ways
both adversely and vice versa