Things in Motion: the Force of Gravity

The video explains gravity as the force pulling objects toward Earth's center, keeping us grounded. It also attracts planets to the sun, maintaining their orbits. Gravity is measured by the force it exerts on mass, which remains constant regardless of location. However, weight varies due to differing gravitational forces, such as on the Moon, where objects weigh less than on Earth.

What role does gravity play in the solar system?

• It has no effect on the planets.

• It repels planets away from the sun.

• It causes planets to collide with each other.

• It keeps planets in orbit around the sun.

How is gravity measured?

• By the amount of force it exerts on a mass.

• By the color of an object.

• By the temperature of an object.

• By the speed of light.

What is mass?

• The color of an object.

• The volume of an object.

• The weight of an object.

• The amount of matter in an object.

Why does a car weigh less on the moon than on Earth?

• Because the gravitational force is weaker on the moon.

• Because the car's mass changes on the moon.

• Because the moon is smaller than Earth.

• Because the moon has no atmosphere.

What is the difference between mass and weight?

• Mass is the amount of matter, while weight is the gravitational force on that matter.

• Mass is measured in pounds, while weight is measured in kilograms.

• Mass is the gravitational force, while weight is the amount of matter.

• Mass and weight are the same.