Acceleration and Free Fall

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.

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

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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

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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

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In Newtonian physics, ________________ is any motion of a body where gravity is the only force acting upon it.

• kinematics

• free fall

• mechanics

• velocity

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Which of the following graphs best represents free fall motion?

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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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NGSS.HS-PS2-1

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

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If an object is free falling onto the Moon, which of the following would be correct?

• It would accelerate at 9.8 m/s²

• It would not encounter any air resistance.

• It would not fall because the Moon has no gravity.

• It would impact the surface and bounce back into space.

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NGSS.MS-PS2-4

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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

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