Acceleration and Freefall

A girl throws a ball straight up in the air. When does the ball accelerate down?

• On the way up.

• On the way down.

• At the top.

• All of the above

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

A car moves and its motion is shown in the graph above. Describe the motion of the car from 2 hours to 4 hours.

• Sitting still 40 miles from its starting point.

• Moving steadily forward at 40 miles per hour.

• Sitting still at the starting point.

• Picking up speed from 0 miles per hour to 40 miles per hour.

Tags

NGSS.MS-PS3-1

If a rocket sled starts from rest, how far does it go if it accelerates at 45 m/s² for 3.0 s?

• 15 m

• 135 m

• 5.0 m

• 202.5 m

Tags

NGSS.HS-PS2-1

A ship starts out moving at 14 m/s. It catches a breeze that accelerates it at 0.80 m/s² for 25 s. How fast is it moving at the end of the 25 s?

• 34 m/s

• 20 m/s

• -6 m/s

• 11.2 m/s

Tags

NGSS.HS-PS2-1

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.HS-PS2-4

What is happening in this graph from point B to C?

• The object is going down a hill.
• The object is returning to its starting location.
• The object is slowing down.
• The object is staying still.

Tags

NGSS.MS-PS3-1

Why does a car accelerate as it round a corner at a constant speed?

• Its direction changes
• It doesn't
• It slows down
• Its speeds up  

Tags

NGSS.HS-PS2-1

A  car starts from rest and after  7 seconds it is moving at 42  m/s. What is the ’s average acceleration?

• 0.17
• 1.67
• 6
• 7

Tags

NGSS.HS-PS2-1

How do I recognize that something is an acceleration?

• It is divided by time twice (m/s/s)
• It is divided by time (m/s)
• The problem is talking about velocity
• The problem talks about distance change

Tags

NGSS.HS-PS2-1

Terry dropped a pebble from the top of his apartment building.  The pebble impacted the ground after falling for 2.2 seconds.  Calculate the velocity of the pebble at impact with the street below.

• -21.5 m/s
• -4.45 m/s
• -9.8 m/s
• -23.7 m/s

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4