Free-Fall

Which one falls faster in vacuum? An elephant or a leaf?

• Elephant

• Leaf

• They are the same

• Nothing can be said

If air resistance is ignored, the distance that a freely falling body in equal time intervals of 1 s _________________

• increases as it falls

• decreases as it falls

• remains the same

• depends on the mass of the body

The velocity-time graph of a stone thrown from the top of a building and striking the ground is as shown in the figure. How many metres high is the building?

• 60 m

• 80 m

• 100 m

• 140 m

If a ball is thrown downward at 30 m/s, what will its speed be at 4 s? (Assume no air resistance)

• 40 m/s

• 70 m/s

• 50 ms

• 10 m/s

If you drop a ball from the top of a building, how fast will it be moving after 6 seconds?

• 10 m/s
• 10 m/s/s
• 60 m/s
• 60 m/s/s

Tags

NGSS.HS-PS2-1

A ball is thrown up in the air with an initial velocity of 40 m/s. What is the ball's velocity after 6 seconds? 

• 20 m/s traveling upward.
• 10 m/s traveling downward.
• 20 m/s traveling downward. 
• 30 m/s traveling downward. 

Tags

NGSS.HS-PS2-1

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

An object free falls for 3.5 seconds. How far does it fall?

• 120.05 m

• 17.15 m

• 60.03 m

• 34.3 m

Which of the dot diagrams best describe the motion of a free-falling object that is dropped from rest?

• Diagram A

• Diagram B

• Diagram C

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

As a rock in FREE FALL falls through the air, acceleration

• stays constant

• decreases until it hits terminal velocity

• increases until it hits terminal velocity

• increases ~10 m/s each second

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4