Gravity

The moon revolves around Earth. The moon travels at a speed of about 1 km/s. What keeps the moon in orbit around Earth?

• gravity

• magnetism

• ocean tides

• solar wind

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

Two objects have a certain gravitational force between them. What would happen if the mass of one of the objects suddenly increased?

• The mass of the other object would increase

• The distance between the objects would increase.

• The gravitational force of the objects would remain constant.

• The gravitational force between the two objects would increase.

Tags

NGSS.MS-PS2-4

Why are Earth, other solar system planets, and most planetary objects spherical?

• erosion made by asteroids hitting the object’s surface after the object’s formation

• heat received from the sun melting the object’s surface at the time of formation

• pressure of atmosphere acting evenly in all directions on the object’s surface

• force of gravity acting evenly in all directions around the center of mass

Tags

NGSS.MS-ESS1-2

Planets are held in their orbit because of their large sizes as well as a certain force that acts over a distance. Which force is responsible for acting on the planets?

• nuclear force

• magnetic force

• space force

• gravitational force

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

The force of gravity on a person or object on the surface of a planet is called

• mass.

• terminal velocity.

• weight.

• free fall.

A person would weigh less on on the Moon than on the Earth because . . .

• Moon has more mass, and therefore more gravity

• Moon has less mass, and therefore more gravity

• Moon has more mass, and therefore less gravity

• Moon has less mass and therefore less gravity

Tags

NGSS.MS-PS2-4

You weight 200 lbs on Planet A and 150 lbs on Planet B. Which planet has a larger gravitational pull?

• Planet A

• Planet B

• Cannot tell, as the weight does not depend on gravity.

• The statement is incorrect because the weight will be the same in both planets.

Tags

NGSS.MS-PS2-4

The diagram shows a satellite in orbit around Earth.

It is orbiting in the direction shown and is pulled toward Earth by gravity. What would happen if Earth’s gravity suddenly disappeared?

• The satellite would fall to Earth

• The satellite would stop moving.

• The satellite would continue to orbit Earth.

• The satellite would move into space in a straight line.

Tags

NGSS.MS-ESS1-2

The dotted lines in the picture show orbital paths of objects. Which statement is true about all of the orbits shown?

• All objects move in circular orbits.

• The size of an object determines the size of its orbit.

• The force of gravity is what holds each object in its orbit.

• The size of both an object and the object it orbits are equal.

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

Studies have shown that the sun is losing mass. Explain how this loss of mass will affect the gravitational force between the sun and Earth.

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4