Unit 9 Lesson 2: Gravity and the Universe

What is an object that is launched or thrown?

• an object

• a projectile

• acceleration

• velocity

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Match Newton's Laws with the correct description.

• Newton's First Law

• When an unbalanced force acts on an object, it accelerates.

• Newton's Second Law

• An object in motion stays in motion unless acted on by an outside force.

• Newton's Third Law

• There is an equal and opposite force exerted on every object that exerts a force.

What is velocity?

• when the speed and direction of an object does not change

• the speed of an object

• the speed of an object in a specific direction

• the direction of an object

________ proposed the nebular hypothesis.

How did gravity affect the formation of the solar system?

• Gravity caused clumps of particles to repel each other.

• If there was no gravity, the solar system would still have formed.

• Gravity did not affect the formation of the solar system.

• Gravity pulled particles together forming clumps, which eventually grew into the sun and the planets.

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What is the Law of Universal Gravitation?

• there is a force that pulls all objects to the ground on Earth

• there is not an attractive force between objects

• there is an attractive force between some objects

• there is an attractive force between all objects

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Reorder the following

• Gravity causes particles to be attracted to each other, so they form clumps.

• Larger clumps form, attracting more particles, becoming even larger.

• The clumps cooled and condensed, forming the sun.

• The other large clumps form planets that orbit the sun.

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Gravitational force is ​​ (a)   for objects with a greater mass and is stronger closer to an object.

• stronger
• weaker

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What is the nebular hypothesis?

• matter started out as particles of dust and ice

• matter started out as separate particles in a cloud of dust and ice

• matter consisting of separate particles in a cloud of dust and gas

• matter in the solar system began as separate particles in a cloud of dust

What are the two characteristics that Kant did not explain in his nebular hypothesis?

• why all planets orbit in the same direction

• why all planets orbit the sun in the same plane

• why the planets are ordered in the order they are in

• why the planets all rotate counterclockwise

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