Free Fall and Momentum

What is the distance a ball falls after 1,2,3,4,5 seconds (assume g is rounded to 10 m/s²)?

• 10, 20, 30, 40, 50 m (meters)
• 5, 20, 45, 80,125 m (meters)
• 5, 10,15, 20, 25 m (meters)
• 10, 25, 60, 90,120 m (meters)

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

What is the velocity of a ball that has been dropped off a cliff after 1 , 2, 3, 4, and 5 seconds? (assume g is rounded to 10 m/s²)?. 

• 10, 20, 30, 40, 50 m/s
• 5, 10, 15, 20, 25 m/s
• 5, 20, 45, 80,125 m
• 10,10,10,10,10 m/s

Tags

NGSS.HS-PS2-1

What is the acceleration of a ball that is dropped off the side of a cliff after 1,2,3,4,5 seconds? (assume g is rounded to 10 m/s²)

• 5,10,15, 20, 25 m/s²
• 10, 20, 30, 40, 50 m/s²
• 5, 20, 45, 80, 125 m/s²
• 10,10,10,10,10 m/s²

Tags

NGSS.HS-PS2-1

A ball is thrown upward in the air with an initial velocity of 40 m/s. How long does it take to reach back to the point it was thrown from?

• 4 seconds 
• 2 seconds 
• 6 seconds 
• 8 seconds 

A ball is thrown up in the air with an initial velocity of 40 m/s. What is the ball's velocity after 2 seconds? 

• 0 m/s 
• 20 m/s traveling upward
• 20 m/s traveling downward
• 40 m/s traveling downward

Tags

NGSS.HS-PS2-1

A ball is thrown up in the air with an initial velocity of 40 m/s. What is the ball's velocity after 6 seconds? 

• 20 m/s traveling upward.
• 10 m/s traveling downward.
• 20 m/s traveling downward. 
• 30 m/s traveling downward. 

Tags

NGSS.HS-PS2-1

In free fall, where does an object have the slowest speed?

• Vi
• Vf
• Vtop
• More than one is correct

What is terminal velocity?

• The highest speed an object reaches because of unbalanced forces
• The highest speed an object reaches because air resistance offsets gravity in the real world
• When an object reaches its final velocity of zero
• Only happens in physics world

If a free falling object takes 10s to travel upward, what is the total time the object is in the air?

• 0s because of symmetry and T_up = +10s, so T_down = -10s. Which means that T_total = 0s.
• 20s because of symmetry and T_up = 10s, so T_down = 10s. Which means that T_total = 20s.
• Greater than 10s, but less than 20s because the object would fall faster than it rose because of gravity. Without more information, you cannot calculate this number.
• Less than 10s because the object begins falling back before the 10s and it falls faster than it rises.

Tags

NGSS.HS-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