AP Physics 03 d Universal Gravitation

Multiple Choice

Why was Newton's insight about the moon's orbit around Earth significant for our understanding of gravity?

• It explained why the moon glows.

• It showed that gravity acts only on Earth.

• It demonstrated that gravity is a universal force acting at a distance.

• It proved that the moon is made of cheese.

Multiple Select

Select all the correct statements about the motion of a cannonball fired from a mountain top according to Newton's reasoning.

• A cannonball with low horizontal speed will hit the Earth soon.

• A cannonball with enough horizontal speed will orbit the Earth.

• A cannonball with too much speed will escape Earth's gravity.

• A cannonball with moderate speed will move in a straight line away from Earth.

Fill in the Blanks

Newton's Law of Universal Gravitation states that every object attracts every other object with a force that is directly proportional to the

of each object.

Labeling

Label the parts of the formula for Newton's Law of Universal Gravitation.

Drag labels to their correct position on the image

mass of object 2

gravitational force

mass of object 1

distance

Multiple Select

Which of the following statements about the inverse-square law of gravitation is/are correct?

• Gravitational force decreases as the distance between objects increases.

• Gravitational force is strongest at the surface of the Earth.

• Gravitational force becomes negligible at very large distances from Earth.

• Gravitational force is independent of the masses of the objects involved.

Multiple Choice

According to the graph, how does the acceleration due to gravity change as the distance from the Earth's center increases?

• It increases linearly.

• It remains constant.

• It decreases rapidly at first and then more slowly.

• It fluctuates unpredictably.

Fill in the Blanks

The force of gravity acting on an object is calculated by dividing the gravitational force by the

of the test object.

Multiple Choice

What is the unit of the gravitational field strength?

• N/kg

• kg/m^3

• m/s^2

• Joule

Multiple Select

How are Field Force and the Acceleration due to Gravity (little "g") related?

• The same equation is used to calculate both

• They are the same

• They are equal to each other

Multiple Choice

What is the realationship between mass of an object and Fg

• Direct

• Direct Square

• Inverse

• Inverse Square

Multiple Choice

What is the relationship between distance between two objects and the Fg on them?

• Direct

• Direct Square

• Inverse

• Inverse Square

Multiple Choice

If the mass of one of the objects doubles the Fg between the two objects will:

• double

• be halved

• increase by four times

• be 1/4

Multiple Choice

Which of the following best describes the relationship between gravitational force and distance according to the quiz?

• a direct relationship

• an inverse relationship

• a direct square relationship

• an inverse square relationship

Multiple Choice

If the mass of both of the objects doubles the Fg will

• double

• increase by 4 times

• be 1/2 the original

• be 1/4 the original