A: ### Quick Answer

**Newton's law of universal gravitation states that the force of gravity is a universal force between all objects proportional to both masses and the square of the distance between them.** This law can be expressed with the equation F₁₂ (m¹ * m²) / d².

Newton's law of universal gravitation was later improved by the addition of the gravitational constant, G, so the equation can be written as F = (G * m¹* m²) / d² where G is the gravitational constant (6.673 x 10-¹¹ N m²/kg²). The gravitational constant was determined by Henry Cavendish more than 100 years after Newton's law. By using the equation combining Newton's law of proportionality with the gravitational constant, the gravitational force between any two objects can be determined.

Learn more about Motion & Mechanics- Q:
## What is Newton's first law of motion?

A:Newton's First Law of Motion defines the concept of inertia. The law states that an object will remain in its original state of motion until acted upon by an outside force.

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## What is Newton's law of viscosity?

A:

Full Answer >**Newton's law of viscosity is a constitutive equation that describes how a fluid resists attempts to move through it.**It holds true with some liquids and fails in others. Therefore, it is not considered a fundamental law of nature.Filed Under: - Q:
## What is Newton's third law?

A:

Full Answer >**Newton's third law states that for every action there is an equal and opposite reaction.**This means that when an object puts a force on another object, the second object exerts the same amount of force against the first object.Filed Under: - Q:
## What is Newton's first law?

A:

Full Answer >**Newton's first law states, "Every object persists in its state of rest or uniform motion in a straight line unless it is compelled to change that state by forces impressed on it."**A more colloquial way of saying it is "an object in motion stays in motion."Filed Under: