Unit 3: Test Review Part 1 (S8P5a & S8P5b)

What is gravitational force?

• The force that pulls objects apart

• The attraction between two masses

• The force that acts only on Earth

• The force of friction between two objects

Answer explanation

Gravitational force is the attraction between two masses, which causes them to pull towards each other. This is why the correct answer is 'The attraction between two masses', as it accurately describes this fundamental force.

Tags

NGSS.MS-PS2-5

NGSS.MS-PS2-4

Which of the following factors does NOT affect gravitational force between two objects?

• Distance between the objects

• Mass of the objects

• The temperature of the objects

Answer explanation

The gravitational force between two objects is affected by their masses and the distance between them. The temperature of the objects does not influence gravitational force, making it the correct choice.

Tags

NGSS.MS-PS2-4

NGSS.MS-PS2-2

Which of the following summarizes how distance affects gravitational attraction?

• Greater distance leads to stronger attraction

• Closer objects experience weaker attraction

• Attraction decreases as distance increases

• Distance has no effect on attraction

Answer explanation

Gravitational attraction decreases as the distance between two objects increases, meaning that the farther apart they are, the weaker the gravitational pull between them becomes.

After collecting data on gravitational force and distance, you find that as distance increases, the force decreases. What can you conclude?

• Distance does not affect gravitational force

• Gravitational force is constant regardless of distance

• There is an inverse relationship between distance and gravitational force

• Gravitational force only depends on mass

Answer explanation

As distance increases, the gravitational force decreases, indicating an inverse relationship. This means that the force is not constant and is affected by the distance between the objects.

If a person weighs 60 kg on Earth, how would their weight change on a planet with higher gravity?

• It would increase.

• It would decrease.

• It would stay the same.

Answer explanation

Weight is the force exerted by gravity on an object. On a planet with higher gravity, this force increases, resulting in a higher weight. Therefore, if a person weighs 60 kg on Earth, their weight would increase on a planet with higher gravity.

What happens to the gravitational force between two objects as the distance between them increases?

• It increases.

• It decreases.

• It remains constant.

• It becomes unpredictable.

Answer explanation

As the distance between two objects increases, the gravitational force between them decreases. This is described by Newton's law of universal gravitation, which states that force is inversely proportional to the square of the distance.

If the mass of one object is increased while keeping the distance constant, the gravitational force will:

• Decrease

• Remain the same

• Increase

• Become zero

Answer explanation

According to Newton's law of universal gravitation, the gravitational force increases with the mass of an object. Therefore, if the mass of one object is increased while keeping the distance constant, the gravitational force will increase.

Tags

NGSS.MS-PS2-4

Gravitational force is best defined as:

• The force that pulls objects apart

• The attraction between two objects with mass

• The speed of an object in motion

• The shape of an object

Answer explanation

Gravitational force is defined as the attraction between two objects with mass. This force pulls objects toward each other, unlike the other options which do not accurately describe gravitational force.

Tags

NGSS.MS-PS2-5

NGSS.MS-PS2-4

Which of the following factors influences the weight of an object on a planet?

• The object's color

• The planet's mass

• The object's temperature

• The distance from the sun

Answer explanation

The weight of an object on a planet is influenced by the planet's mass due to the gravitational force it exerts. The greater the mass of the planet, the stronger the gravitational pull, which increases the object's weight.

Tags

NGSS.MS-PS2-4

What is the charge of an electron?

• Positive

• Neutral

• Negative

• Variable

Answer explanation

The charge of an electron is negative, which is fundamental to its role in electricity and chemistry. This distinguishes it from protons, which have a positive charge, and neutrons, which are neutral.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5