Free Fall

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 decreases

• the velocity remain 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

• 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

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

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

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

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

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