Free Fall Concepts

The standard acceleration due to gravity (or standard acceleration of free fall),is the nominal gravitational acceleration of an object in a vacuum near the surface of the Earth. It is defined by standard as:

• 9.8 m/s.

• 9.8 m.

• 9.8 m/s².

• 9.8 s.

Juan is standing on the top observation deck of the Eiffel Tower in Paris at a height of 300 meters. He drops his cell phone. How fast will the phone be traveling when it hits the ground? Ignore the effect of air resistance.

• 9.8 m/s

• 76.68 m/s

• 149.76 m/s

• 46.99 m/s

Tags

NGSS.MS-PS2-4

NGSS.MS-PS3-1

NGSS.MS-PS3-5

If an object is in free fall for three seconds, how fast will it be falling?

• 9.8 m/s

• 19.6 m/s

• 29.4 m/s

• 39.2 m/s

Tags

NGSS.MS-PS2-4

Which would hit the ground first if dropped from the same height in a vacuum—a feather or a metal bolt?

• the feather

• the metal bolt

• They would hit the ground at the same time.

• They would be suspended in a vacuum.

What happens to the velocity of a ball as it is dropped off a cliff? 

• It decreases at a uniform rate 

• It increases at a uniform rate 

• It is constant 

• It increases at a non-uniform rate

Tags

NGSS.MS-PS2-4

NGSS.MS-PS3-1

NGSS.MS-PS3-5

How long did it take this object to travel back to its reference/starting point?

• 20 s

• 30 s

• 60 s

• 100 s

Do free falling objects move at constant velocity or do they accelerate?

• Falling objects accelerate at -9.8 m/s²

• Falling object move at constant velocity

• Falling objects accelerate at 100 m/s²

• It depends on the mass: heavy objects accelerate, light objects do not

Tags

NGSS.MS-PS2-4

What values are always known for a free falling object?

• v_i = 0 m/s
   a = -9.8 m/s²

• v_i = -9.8 m/s
   a = -9.8 m/s²

• v_i = -9.8 m/s
   a = 0 m/s²

• d = -9.8 m
  v_i = 0 m/s

Which of the following graphs best represents free fall motion?

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Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

A man drops his camera off of the top of the oil derrick tower at Six Flags. Which of the following kinematic equations would he use in order to calculate the speed the camera was travelling when it hit the ground?

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