Free Fall Concepts

If an object is dropped from a cliff of 100m, what are your 'givens' you can start with?

CHECK ALL THAT APPLY.

• d = 100 m

• v_i = 0

• t = 100 s

• a = 9.8 m/s²

• v_f = 0

You are standing on the top observation deck of the Eiffel Tower in Paris at a height of 300 meters. You drop your cell phone. How fast will the phone be traveling when it hits the ground?

• 9.8 m/s

• 76.68 m/s

• 149.76 m/s

• 46.99 m/s

Tags

NGSS.HS-PS2-1

An object free falls for 3.5 seconds. How far does it fall?

• 120.05 m

• 17.15 m

• 60.03 m

• 34.3 m

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

While walking in the classroom you accidently hit a water bottle and it falls off of the 0.75 m desk. How long does it take to reach the ground?

• 0.39 s

• 2.04 s

• 2.76 s

• 0.82 s

Tags

NGSS.MS-PS2-4

If you know the time an object is in the air, can you find the Vf of the object?

• Yes, you would have to halve the time since the Ttotal is for both rise and fall and you would have to calculate the height the object rose before finding the Vf

• Yes, you would use the time the object was in the air to find the distance the object travels upward before 

• No, you are not given enough information

• No, it depends on the acceleration, which is different on the way up and on the way down.

Tags

NGSS.HS-PS2-1

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.

Two rocks with different size and mass are dropped from the same height. Which of the rock will reach the ground first?

• greater rock

• smaller rock

• both reach the ground at the same time

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

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.MS-PS2-2

NGSS.MS-PS2-4

A baseball is thrown up into the air. What direction is the acceleration of the ball?

• upward

• downward

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

If you throw a baseball straight up, what is its velocity at the highest point?

• 9.8 m/s²

• 9.8 m/s

• 0 m/s²

• 0 m/s

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS2-4