free-fall, projectiles, and vectors check

If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by 

• about 5 m/s.
• about 9.8 m/s^2

• about 15 m/s.
• a rate that depends on its initial speed.

Tags

NGSS.HS-PS2-1

Free fall is any motion of a body where ____ is the only force acting upon it.

• body attraction

• tension

• gravity

• velocity

Tags

NGSS.HS-PS2-4

If an object is in free fall for three seconds, how fast will it be falling at the end of its motion?

vf= gt

• 9.8 m/s

• 19.6 m/s

• 29.4 m/s

• 39.2 m/s

Tags

NGSS.HS-PS2-4

A pumpkin is dropped from a 35 m building. What is its initial velocity (v_i)?

• 9.8 m/s²
• 35 m
• 0 m/s
• 9.8 m/s

Tags

NGSS.MS-PS2-2

Dave runs a 400 m race with a speed of 4 m/s. What time will it take him to finish the race?

• 400 minutes
• 100 minutes
• 100 seconds 
• .25 seconds 

• 0.09 s

• 0.03 s

• 0.3 s

• 0.9 s

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

A vector quantity has ______________.

• Magnitude only

• Magnitude and Direction

• Direction only

• Direction and angles

A boat is traveling at 50 m/s in a river flowing at 15 m/s in the exact same direction. What is the resultant velocity of the boat?

• 65 m/s

• 35 m/s

• 52 m/s

• It cannot be determined

A hiker walks 40 m due North then turns due South and walks 60 m. What is the resultant displacement?

• 100 m North

• 100 m South

• 20 m North

• 20 m South

Click all the measurements needed to determine the range of a horizontal projectile.

• height

• horizontal velocity

• mass of the projectile