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Types of Force
Introduction
Friction
Magnetism
Gravity
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GRAVITY

There is a legend which says that while lying against a tree in an orchard, Isaac Newton was hit on the head by a falling apple. What made the apple fall to the ground? Was it a force from the earth on the apple? From this event, it is supposed, Newton theorized about the force of gravity. He explained the motions of the apple, and the earth and other planets around the sun as mutual attractions to each other. This attraction was called the force of gravity. The more mass or volume each object has, the greater the force of attraction. As the objects increase their distance apart, the attraction gets less or decreases.

Without gravity, we would never be able to keep our feet on the ground, and at the same time, not be able to move off the ground. Without gravity, the moon would move in a straight line away from the earth; gravitational force of the earth however pulls or attracts the moon to orbit around it. Gravity also keeps planets on orbit around the sun in the solar system.

Imagine this, when you are biking uphill, the earth's gravity is pulling you back down the hill, so that makes it hard to bike uphill. On the other hand, when you finally reach the top and you are biking downhill, the earth's gravity is pulling you down the hill making your bike speed faster downhill. In fact, anything going downhill gains speed as the earth's gravitational force is pulling it down.

Types of Force | Introduction | Friction | Magnetism | Gravity
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