Does gravity keep a boat from sinking or keep an airplane in the air ?

Answer 1

Hi, its not gravity but a force opposite to gravity that prevents a boat from sinking and keeps an airplane in the air. Sorry, but I forgot the name of the force, I think it begins with a B. O, the second person said it- Buoyancy.

Answer 2

Well, gravity does a lot of things, including these. The reasons boats and ships float is because they displace more water than their weight. By doing this, they float. Submarines achieve the opposite effect by displacing a given amount of water, but modifying the weight of the sub by taking in air or water. So gravity both helps boats float and sink. Gravity indirectly keeps planes in the air by holding the atmosphere to earth. A plane stays in the air by maintaining a speed high enough to generate the lift necessary (the lift comes from the shape of the wings, slow over the top and fast underneath, this causes the air to pull up on the wing and the rest of the plane). Gravity will pull a plane back to the ground when the plane is either speeding towards the ground or if the plane does not create enough airspeed to maintain its lift. I hope this helps.

Answer 3

In a sense, gravity keep a boat from sinking in that it presses the boat into the water, which presses back keeping it floating. The water molecules are compressed by the flat underside of the boat (as long as it is intact) providing a force that keep it just below water level. However, in order to float a boat must be able to displace enough water to support its weight. If a boat is too heavy, gravity wins and the boat sinks.

Airplanes are kept in the air by a combination of forces to defy the force of gravity using lift. Lift is created in an airplane by the shape of its wing, which bends the air around the top part of the wing, giving it a longer path to travel. This creates a pull upwards as defined by Bernoulli's principle. By manipulating the power of thrust and shape of the wing an airplane can climb, descend, or maintain altitude.

Answer 4

Bouancy keeps a boat from sinking and gravity is what brings an airplane back to Earth.

Answer 5

Indirectly, it does both. In effect, water forms bodies (lakes, rivers, and oceans) because of gravity. Without gravity, water woule be no more than vapor, or tiny droplets floating around in the air.

Airplanes fly because of an inbalance of air pressure. The pressure above the wing is lower than the air below. This is caused by a combination of the airplane's weight and its velocity. So, yes! It does both!

Answer 6

none
buoyancy keeps a boat afloat
air pressure keeps airplanes in the air

Answer 7

Actually buoyancy helps a boat from sinking and gravity is what that helps the plane to maintain a particular course and return safely to earth otherwise instead of crashing planes would drift of into space. Man how funny is that..........

Answer 8

No, Boyancy keeps boats in the water and Lift keeps a plane in the air...i think

Answer 9

Dynamics, keeps the boat afloat and the plane in the air

Answer 10

no
a boat floats because of its shape. the peculiar shape of the boat results in lots of air spaces and displaced water. the airplace keeps afloat by its power and shape, reducing friction as much as possible. the wings maintain balance and the engienes produce enough thrust to keep it airborne. imagine tossing a rock. the initial velocity keeps the rock afloat but the initial velocity decreases, reducing its height. in a plane, the velocity rarely decreases and often increases