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

What is the 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

NGSS.HS-PS2-4

How does the Vi compare to the Vf in a free fall problem?

• Vi and Vf are exactly the same, this is because of symmetry
• Vi and Vf are close but Vf is larger because you would fall faster than you would rise, since you are slowing down
• Vi and Vf are the same in magnitude, but different in vector
• Since the object must start at 0m/s and end at 0m/s, Vi and Vf are the same

The change in velocity in a given time period is?

• Vi
• Vf
• a
• d

Tags

NGSS.HS-PS2-1

When speed and direction remain the same throughout a 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 accelerate
• It is a constant acceleration
• It is a changing acceleration

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

Tags

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

Tags

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 in a vacuum.

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