Free Fall Practice

The acceleration of a freely falling body on Earth is

• 9.8 m/s.

• 9.8 m.

• 9.8 m/s².

• 9.8 s.

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.

When there is no air resistance, objects of different masses dropped from rest

• fall with equal accelerations and with equal displacements.
• fall with different accelerations and with different displacements.
• fall with equal accelerations and with different displacements.
• fall with different accelerations and with equal displacements.

Tags

NGSS.HS-PS2-1

A ball is thrown upwards and caught when it comes back down. In the absence of air resistance, the

when would the ball reach a velocity of 0 m/s?

• at the top

• at the bottom

• in the middle

Tags

NGSS.MS-PS2-4

In a normal environment, why does a bowling ball and feather hit the ground at different times when dropped from the same height?

• They don't; they hit the ground at the same time.
• One is more dense than the other.
• One is heavier than the other.
• Air resistance 

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

NGSS.HS-PS2-4

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

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