Gravity

Front

Who was the first person to study gravity?

Back

Isaac Newton

Front

Why does a person weigh less on the Moon than on Earth?

Back

The Moon has less mass and therefore less gravity.

Front

What is mass?

Back

A measure of how much matter an object contains.

Front

How many Earth years is equal to one year on Pluto?

Back

248 years.

Front

Why does a feather fall slower than a bowling ball when dropped?

Back

Air resistance causes the feather to fall slower.

Front

What is the law of universal gravitation?

Back

Every point mass attracts every other point mass in the universe with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

Front

What is the difference between mass and weight?

Back

Mass is the amount of matter in an object, while weight is the force exerted by gravity on that mass.

Front

What is gravitational acceleration on Earth?

Back

Approximately 9.81 m/s².

Front

How does gravity affect the motion of planets?

Back

Gravity keeps planets in orbit around the sun and governs their motion.

Front

What is the relationship between gravity and distance?

Back

Gravity decreases with the square of the distance between two objects.