Physics: Friction and 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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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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NGSS.MS-PS2-2

Terminal velocity is:

• The turbulent speed of an object that has been slowed by fluid

• The speed of laminar flow

• The drag force on a sphere going constant speed in a viscous fluid

• When the drag force equals the gravitational force acting on a falling body now going at a constant speed

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The resistance of an object to a change in its motion is

• circumference

• inertia

• air resistance

• weight

The upward force which is exerted against a falling object is

• gravity

• terminal velocity

• air resistance

• intertia

When a falling object stops accelerating and falls at a constant speed, it is

• fluency

• constant velocity

• acceleration

• terminal velocity

Units used to measure force are

• pounds

• newtons

• isaacs

• mass

A force which causes objects to fall is

• weight

• gravity

• air resistance

• absorbency

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NGSS.MS-PS2-4

Friction is a force that acts in an ___________ direction of movement.

• similar
• opposite
• parallel
• west