PHYS SCI B Unit 3 Review

What is the equation for finding the gravitational force of an object?

• F = m x g

• F = m + g

• F = m - g

• 1000 N

• 1998 N

• 2000 N

• 4000 N

Which statement(s) best describes the gravitational force of an object?

• The gravitational force of an object increases as its mass increases.

• The gravitational force of an object increases as its mass decreases.

• The gravitational force of an object decreases as its mass increases.

• All of the above

Which statement(s) best describes the gravitational force of an object?

• The gravitational force of an object increases as it gets farther away.

• The gravitational force of an object increases as it gets closer.

• The gravitational force of an object decreases as it gets closer.

• The gravitational force of an object does not depend on distance.

• Earth

• Mars

• I will weight the same on both planets.

• 2 N

• 7.42 N

• 19.6 N

• 27.5 N

Charli wants to test the effect of gravity on objects with different masses. She drops pennies from each floor in a 4-story building. In each case, she times how long it takes the pennies to reach the ground. What is wrong with her experiment’s design?

• She didn't drop all of the pennies at the exact same time.

• All of the pennies are the same shape.

• She only used pennies and not other coins too.

• There is nothing wrong with her experiment's design.

What is air resistance?

• The force that acts in the same direction to an object moving through the air

• The force that acts in the opposite direction to an object moving through the air

• The force that acts on an object at rest on a flat surface

• None of the above

Which of the following factors affect air resistance?

• The velocity of an object

• The area of an object

• The shape of an object

• All of the above

Kali drops two $100 dollar bills from the top of the Empire State Building. One bill is crumpled, and the other bill is folded into an airplane. Will the two bills land on the sidewalk at the same time?

• Yes because they have the same mass.

• Yes because they have the same shape.

• No because the bills were not dropped from a sufficient height for air resistance to affect them.

• No because the bills have different shapes and so air resistance will affect them differently.