Free Fall Motion

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.HS-PS2-1

NGSS.HS-PS2-4

A textbook is dropped from a second floor window and falls to the ground. What happens to the acceleration as the book falls to the ground

• the acceleration increases

• the acceleration decreases

• the acceleration remains constant

Tags

NGSS.HS-PS2-1

A baseball is thrown up into the air. What happens to the velocity as the ball rises in the air?

• the velocity increases

• the velocity decreases

• the velocity remains constant

Tags

NGSS.HS-PS2-1

A baseball is thrown up into the air. What happens to the acceleration as the ball rises in the air?

• the acceleration increases

• the acceleration decreases

• the acceleration remains constant

Tags

NGSS.HS-PS2-1

The acceleration due to gravity near the surface of Earth is equal to

• 9.8 m/s

• 9.8 kg x m/s

• 9.8 N

• 9.8 m/s²

Tags

NGSS.HS-PS2-4

In a normal environment, why does a bowling ball and feather hit the ground at different times when dropped from the same height?

• They don't; they hit the ground at the same time.
• One is more dense than the other.
• One is heavier than the other.
• Air resistance 

An object in free fall

• ignores air resistance.

• undergoes a downward acceleration.

• has an acceleration of -9.8 m/s².

• all of these.

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

Ball A is dropped from rest from a window. At the same instant, ball B is thrown downward; and ball C is thrown upward from the same window. Which statement concerning the balls after their release is necessarily true if air resistance is neglected?

• At some instant after it is thrown, the acceleration of ball C is zero.

• All three balls have the same initial velocity.

• All three balls have the same velocity at any instant.

• All three balls have the same acceleration at any instant.

Tags

NGSS.HS-PS2-1

Heavier objects free fall faster than lighter objects.

• True

• False

Tags

NGSS.MS-PS2-4

1. In analyzing freely falling bodies, we neglect the effect of ___ to the object.

• A. gravity

• B. air resistance

• C. gravity and air resistance

• D. all forces except air resistance