8th Grade Science Q2

Front

What is gravitational pull?

Back

Gravitational pull is the force by which a planet or other celestial body attracts objects toward its center. It is stronger on bodies with greater mass.

Front

How does distance affect gravitational pull?

Back

Gravitational pull decreases with increasing distance from the center of the mass. The farther you are from a mass, the weaker the gravitational force.

Front

What is an unbalanced force?

Back

An unbalanced force is a force that causes an object to change its state of motion. It can cause an object to start moving, stop moving, or change direction.

Front

What is a mechanical wave?

Back

A mechanical wave is a wave that requires a medium (solid, liquid, or gas) to travel through. Examples include sound waves and water waves.

Front

What is the relationship between mass and gravity?

Back

The greater the mass of an object, the stronger its gravitational pull. This is why Earth, with its large mass, has a strong gravitational pull.

Front

What evidence did the Balloon Lab provide?

Back

The Balloon Lab provided evidence that celestial objects are moving away from each other, supporting the theory of the expanding universe.

Front

What happens to an object in motion when an unbalanced force is applied?

Back

When an unbalanced force is applied to an object in motion, it will accelerate in the direction of the force, changing its speed or direction.

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. Weight can change depending on the gravitational pull.

Front

What is zero gravity?

Back

Zero gravity, or microgravity, is a condition in which objects appear to be weightless and free-fall at the same rate as their surroundings, creating the sensation of weightlessness.

Front

How does the Moon's gravity compare to Earth's?

Back

The Moon's gravity is about 1/6th that of Earth's, which is why astronauts used weighted boots to walk on the Moon.