free fall conceptual physics

________________ is any motion of a body where gravity is the only force acting upon it.

• kinematics

• free fall

• mechanics

• velocity

The gravitational acceleration of an object in a vacuum near the surface of the Earth is defined as:

• g = 9.8 m/s.

• g = 9.8 m.

• g = 9.8 m/s².

• g = 9.8 s.

Tags

NGSS.HS-PS2-4

When an object falls, ______________________________.

• 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

The change in velocity in a given time period is?

• V_i ^{- initial velocity}

• V_f ^{- final velocity}

• a ^{-acceleration}

• d ^{- distance}

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

• Falling objects accelerate at 9.8 m/s²

• Falling object move at constant velocity

• Falling objects accelerate at 100 m/s²

• It depends on the mass: heavy objects accelerate, light objects do not

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 velocity of the book as it falls to the ground?

• the velocity increases by about 10 m/s each second

• the velocity decreases by about 10 m/s each second

• the velocity remains constant

Tags

NGSS.HS-PS2-1

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 by about 10 m/s each second.

• the acceleration decreases randomly.

• the acceleration remains constant.

Tags

NGSS.HS-PS2-1

If an object is in free fall for three seconds, about how fast will it be falling?

• 10 m/s

• 20 m/s

• 30 m/s

• 40 m/s

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

If an object is in free fall for three seconds, about how far will it have fallen?

• 9.8 m/s

• 5 m

• 20 m

• 45 m

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

Juan is standing on the balcony of his hotel room, at a height of 45 meters. He accidentally drops his cell phone over the railing. How fast will the phone be traveling when it hits the ground? Ignore the effect of air resistance. (hint: how long does it take to hit the ground?)

• 9.8 m/s (10 m/s if you round 'g' to 10 m/s²)

• 24.9 m/s (30 m/s if you round 'g' to 10 m/s²)

• 149.76 m/s (150 m/s if you round 'g' to 10 m/s²)

• 46.99 m/s (50 m/s if you round 'g' to 10 m/s²)

Tags

NGSS.HS-PS2-1