Free Fall

What is the acceleration of a ball that is dropped off the side of a cliff after 1,2,3,4,5 seconds? (assume g is rounded to 10 m/s²)

• 5,10,15, 20, 25 m/s²

• 10, 20, 30, 40, 50 m/s²

• 5, 20, 45, 80, 125 m/s²

• 10,10,10,10,10 m/s²

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

What is the vertical velocity of a ball that has been dropped off a cliff after 1 , 2, 3, 4, and 5 seconds? (assume g is rounded to 10 m/s²)?.

• 10, 20, 30, 40, 50 m/s

• 5, 10, 15, 20, 25 m/s

• 5, 20, 45, 80,125 m

• 10,10,10,10,10 m/s

Tags

NGSS.HS-PS2-1

How does the initial vertical velocity, Viy, compare to the final vertical velocity, Vfy, when a ball is thrown up into the air and caught at the same height ?

• Vi y and Vfy are exactly the same, this is because of symmetry

• Viy and Vfiy are close but Vfy is larger because you would fall faster than you would rise, since you are slowing down

• Viy and Vfy are the same in magnitude, but different in direction.

• Viy and Vfy are different in magnitude and direction.

The change in velocity in a given time period is?

• initial velocity

• final velocity

• acceleration

• displacement

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NGSS.HS-PS2-1

When speed and direction remain the same throughout motion, this is called?

• Accelerated motion

• Constant motion

• Changing motion

• Changing velocity

When the velocity of an object does not change, what happens to its acceleration?

• Nothing, it does not accelerate.

• It is constant acceleration

• It is changing acceleration

• Need more information to determine

Tags

NGSS.HS-PS2-1

When an object falls in physics world, what happens?

• It accelerates at a constant rate until it hits the ground
• It accelerates at a non-constant rate until it hits the ground
• It accelerates at a constant rate until it reaches terminal velocity
• It accelerates at a non-constant rate until it reaches terminal velocity

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NGSS.HS-PS2-1

NGSS.HS-PS2-4

Which of the following statements applies to the motion of a ball rising and then falling in free fall?

I. The ball has constant acceleration as it moves upward.

II. The ball has constant acceleration at the top of its path.

III. The ball has constant acceleration as it moves downward.

• I only

• III only

• I and III

• I, II, and III

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NGSS.HS-PS2-1

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 (floating) in a vacuum.

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NGSS.MS-PS2-4

Which would fall with greater acceleration in a vacuum—a leaf or a stone?

• the leaf
• the stone
• They would accelerate at the same rate.
• It is difficult to determine without more information.

Tags

NGSS.HS-PS2-1