PHYSICS 14 Falling Objects & Air Resistance

An object is falling downward through Earth's atmosphere. In which direction is the air resistance force?

• Down

• Up

• Around the object

• Through the object

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An airplane flies east at 400 km/hr. In which direction is the air resistance force acting upon the airplane?

• East

• West

• Up

• Down

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Look at the pictures of the cars. Which car will have the most air resistance force acting upon it? They will be moving at the same speed.

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• 
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• All will have equal air resistance force.

Objects #1, #2, #3, and #4 are sliding across the table. All blocks move at the same speed of 2 m/s. The blocks have different masses.

Which block has the greatest air resistance force acting upon it?

• Block #1

• Block #3

• Block #4

• All will have equal air resistance force.

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Blocks #1, #2, #3, and #4 have equal mass. All four blocks slide across the table with a speed of 2 m/s. Which block has the lowest air resistance force acting upon it?

• Block #1

• Block #2

• Block #4

• All have equal air resistance force.

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Blocks #1, #2, #3, and #4 have equal mass. All four blocks slide across the table with a speed of 2 m/s. Which block has the greatest air resistance force acting upon it?

• Block #1

• Block #2

• Block #4

• All have equal air resistance force.

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Blocks #1, #2, #3, and #4 have equal mass. All four blocks slide across the table at different speeds. Which block has the greatest air resistance force acting upon it?

• Block #1

• Block #2

• Block #4

• All have equal air resistance force.

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Where will the airplane will be affected by the greatest air resistance force?

• Moving on the runway (at the airport) at 100 m/s.

• Flying at 2000 m altitude at 100 m/s

• Flying at 5000 m altitude at 100 m/s

• The airplane is affected by equal air resistance force at all three places.

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Where will the airplane will be affected by the greatest air resistance force?

• Flying at 2000 m altitude at 100 m/s.

• Flying at 2000 m altitude at 200 m/s.

• Flying at 2000 m altitude at 300 m/s.

• The airplane is affected by equal air resistance force at all three flying speeds.

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Which best describes why a falling object will reach its terminal velocity?

• Gravity force is equal and opposite air resistance force.

• Air resistance force is equal and opposite the freefall velocity.

• Gravity force is equal and opposite the object's mass.

• The object's mass is equal and opposite the gravity force.

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