AP Physics 2 Topic 7.1

You throw a rock upward. The rock is moving upward, but it is slowing down. If we define the ground as the origin, the position of the rock is____ and the velocity of the rock is_____. 

• positive, positive
• negative, positive
• positive, negative
• negative, negative

Tags

NGSS.HS-PS2-4

A bird flies 3.0 km due west and then 2.0 km due north. Another bird flies 2.0 km due west and 3.0 km due north. What is the angle between the net displacement vectors for the two birds? 

• 23^o
• 34^o
• 56^o
• 90^o

A student walks 1.0 mi West and then 1.0 mi North. Afterward how far is she from her starting point? 

• 1.0 mi 
• 1.4 mi 
• 1.6 mi
• 2.0 mi 

Riviera starts at position x=23 m along a coordinate axis. She then undergoes a displacement of -45 m. What is her final position? 

• 23 m 
• -22 m 
• 22 m 
• -16 m 

A ball rolling along a straight line with velocity 0.35 m/s goes from x=21 m to x=7.3 m. How much time does this take? 

• 84s
• 23s 
• 15s 
• 64s 

 In a collision the car changes direction in 0.100 seconds. If a car were to collide with a wall in a 20 g collision with an impact velocity of 30 mph, then what would be the car’s rebound speed off the wall?  

• -6.21 m/s 
• 6.21 m/s 
• .43 m/s 
• 7.21 m/s 

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-3

In a collision the air bags deploy and collapses in 0.300 seconds. This is the time for the car to change direction. A car collides with a wall in a 20 g collision. If the car’s rebound speed equaled its impact speed, what would be this speed?    

• 30 m/s 
• 29.4 m/s 
• 28.4 m/s 
• 27.4 m/s 

Tags

NGSS.HS-PS2-2

A seat belt is designed to slow a passenger down with a 10 g  deceleration.  A typical collision lasts 0.300 seconds.  6 inches are between the passengers torso, and the steering wheel -this distance is called the rattle distance.  At what speed can the car impact, with a final speed of zero, such that the belt is to just do its job and save the passenger’s life?  

• 30 m/s 
• 28.4 m/s 
• 29.4 m/s
• 28.5 m/s 

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-3

On Jupiter a rock will fall to the ground with an acceleration of  26.94 m/s 2 . What is the acceleration of the rock in Earth g’s? 

• 23.7 g 
• 1.6 g
• 9.8 g
•  2.75 g 

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

A jet is flying at 175 m/s when it begins to accelerate at 3.50 g’s. How much time will it take to travel 1.00 mile? 

• 5.85 sec 
• 5.0 sec
• 6.7 sec 
• .097 sec 

Tags

NGSS.HS-PS2-1