Gravity on earth pulls objects downward toward the ground. Rain is a good example: the clouds don't "throw" the rain to the ground, but instead when there is so much water that it gets heavy for the cloud to hold, the water then falls to the ground because of gravity. Know that gravity does work on water: objects like rocks that cannot float are immediately pulled to the bottom. And gravity does work on birds (and planes, and other things that fly) - it's just that birds have the ability to work against gravity's pull by flapping their wings. But if they stop using their wings, gravity will pull them to the ground.

Gravity is a force that pulls objects downward, so when you jump up in the air you'll always come back down. Gravity doesn't mean that nothing can ever go up: trees can grow up into the sky, sand can blow into the air - but gravity keeps them from floating away.

The fact that it is hard work to run or walk uphill but much easier to run downhill shows how gravity pulls things downward. If you are going downhill, gravity is working with you to help you get there, but if you're going uphill you have to work against gravity. Note that the heights of trees isn't really constrained by gravity but instead by the kind of tree, the nutrients it receives, and those things. The fact that big planes can fly also isn't good evidence for gravity; planes use advanced technology to counteract the force of gravity, or otherwise they'd be pulled down. And although the stars in the sky are affected by gravity in their own way, they're not good examples of how things are pulled downward by gravity since to us from our vantage point they're way up in the sky.

Because gravity pulls things down toward the ground, dropping objects to show how quickly they fall would be a good way to demonstrate how gravity works.

A slide is fun because of the way that gravity pulls you down once you get started sliding. You don't have to do any work - once you let go, gravity does the rest! The other equipment requires you to climb or push; slides use gravity to give you all the fun without the work.

The fact that a tree’s leaves were once high in the air attached to it but now lie on the ground is evidence that, as soon as they were detached from the tree, gravity acted upon them and then fell down to the ground. Note that the airplane landing also approaches the ground, but it was not independently brought down by gravity, but instead navigated there by a pilot.

Gravity on earth pulls objects downward toward the ground. Rain is a good example: the clouds don't "throw" the rain to the ground, but instead, when there is so much water that it gets heavy for the cloud to hold, the water then falls to the ground because of gravity. In this example, the roots will grow downwards because of gravity. Geotropism is the influence of gravity on plant growth or movement. "Geo" means earth or ground, and "tropism" means a plant movement triggered by a stimulus. In this case, the stimulus is gravity. Roots explore the soil looking for water and nutrients to absorb.

Gravity on earth pulls objects downward toward the ground. Rain is a good example: the clouds don’t “throw” the rain to the ground, but instead, when there is so much water that it gets heavy for the cloud to hold, the water then falls to the ground because of gravity. In this example, the roots will grow downwards because of gravity. Geotropism is the influence of gravity on plant growth or movement. “Geo” means earth or ground, and “tropism” means a plant movement triggered by a stimulus. In this case, the stimulus is gravity. Roots explore the soil looking for water and nutrients to absorb.

Gravity on earth pulls objects downward toward the ground. Rain is a good example: the clouds don’t “throw” the rain to the ground, but instead, when there is so much water that it gets heavy for the cloud to hold, the water then falls to the ground because of gravity. In this example, the roots will grow downwards because of gravity. Geotropism is the influence of gravity on plant growth or movement. “Geo” means earth or ground, and “tropism” means a plant movement triggered by a stimulus. In this case, the stimulus is gravity. Roots explore the soil looking for water and nutrients to absorb.

声明,“重力可以ob之间的行为jects that are not touching," is correct. Gravity exerts a pull on other objects, and this can take place between objects that are not touching. Gravity can act over long distances (like between objects in the solar system). On Earth, we feel gravity when we are going down a slide or rollercoaster, riding a bike downhill, or letting a toy cr go from the top of a ramp. There is an invisible dove that pulls everything downwards, gravity.