Free Fall Concepts

When throwing a ball straight up, which of the following is true about its velocity (v) and its acceleration (a) at the highest point in its path?

• both v = 0 and a = 0

• v does not = 0, but a =0

• v = 0, but a does not = 0

• both v and a do not = 0

You throw a ball straight up in the air. After it leaves your hand, at what point in its flight does it have the maximum value of ACCELERATION?

• It's acceleration is constant everywhere

• at the top of it's trajectory

• halfway up the top of its trajectory

• just after it leaves your hand

• just before it returns to your hand on the way down

Alice and Bill are at the top of a building. Alice throws her ball downward. Bill simply drops his ball. Which ball has the greater ACCELERATION just after release?

• Alice's ball

• it depends on how hard the ball was thrown

• neither - they both have the same acceleration

• Bill's ball

You throw a ball upward with an initial speed of 10 m/s. Assuming that there is no air resistance, what is its speed when it returns to you? (Hint: Symmetry)

• more than 10 m/s

• 10 m/s

• less than 10 m/s

• zero

Tags

NGSS.MS-PS2-4

NGSS.MS-PS3-1

NGSS.MS-PS3-5

______________________ is any motion of an object where gravity is the only force acting upon it.

• kinematics

• mechanics

• free fall

• velocity

The accepted (or standard) acceleration due to gravity on Earth, when neglecting air resistance is:

• 9.8 m/s

• 9.8 m/s²

• 9.8 m

• 9.8 s

Tags

NGSS.MS-PS2-2

Do free falling objects move at a constant velocity, or do they accelerate?

• Falling objects accelerate at -9.8 m/s²

• Falling objects accelerate at 100 m/s²

• Falling objects move at a constant velocity

• It depends on the mass

Tags

NGSS.MS-PS2-4

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

• the velocity increases

• the velocity remains constant

• the velocity decreases

Tags

NGSS.MS-PS2-4

NGSS.MS-PS3-1

NGSS.MS-PS3-5

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 remains constant

• the acceleration decreases

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

If an object is dropped and falling to the ground, are the velocity and acceleration of the object in the same or opposite direction?

• same

• opposite

• perpendicular