Free Fall

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

NGSS.HS-PS2-4

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

A baseball is thrown up into the air. What direction is the velocity of the ball the instant after it leaves the person's hand?

• upward

• downward

Tags

NGSS.HS-PS2-1

Any motion where gravity is the only force acting on an object is called ___________________.

• kinematics

• free fall

• mechanics

• velocity

Tags

NGSS.MS-PS2-4

The acceleration due to gravity near the surface of the Earth, if we ignore air resistance, is

• 9.8 m/s.

• 9.8 m.

• 9.8 m/s².

• 9.8 s.

Tags

NGSS.HS-PS2-4

Heavier objects free fall faster than lighter objects in a vacuum found in outer space or on the moon.

• True

• False

The state that exists when the only force acting on an object is gravity is called

• free fall

• inertia

• acceleration

• momentum

Tags

NGSS.MS-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.

IV. The ball has a constant acceleration at all times when it is in the air.

• I

• II

• III

• IV

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.

Tags

NGSS.HS-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