Final Review AP

Balls 1 and 2 are each thrown horizontally from the same height above level ground, but ball 2 has a greater initial velocity after leaving the thrower’s hand. If air resistance is negligible, how do the accelerations of the balls and the times it takes them to hit the ground compare?

• Acceleration: Greater for ball 2

  Time to ground:

  Greater for ball 2

• Acceleration: Greater for ball 2

  Time to ground:

  Equal

• Acceleration:

  Equal

  Time to ground:

  Equal

• Acceleration:

  Equal

  Time to ground:

  Greater for ball 2

Tags

NGSS.HS-PS2-1

The figures above show a small block of mass 0.20kg on a track in the shape of a circular arc. The block is released from rest at a height H above the floor, as shown in Figure 11. The block slides along the track with negligible friction and leaves it at a height of 0.40m above the floor and a speed of 3.0m/s at a 30° angle, as shown in Figure 22.

After the block leaves the track, what is the block’s speed when it reaches the highest point of its motion?

• 0

• 1.5 m/s

• 2.6 m/s

• 3.0 m/s

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

NGSS.HS-PS3-1

The graphs above represent the position x, velocity v, and acceleration a as a function of time t for a marble moving in one dimension. Which of the following could describe the motion of the marble?

• Rolling along the floor and then bouncing off a wall

• Rolling down one side of a bowl and then rolling up the other side

• Rolling up a ramp and then rolling back down

• Falling then bouncing off a hard floor

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

A person throws a marble straight up into the air, releasing it a short height above the ground and catching it at that same height. If air resistance is negligible, which of the following graphs of position y versus time t is correct for the motion of the marble as it goes up and then comes down?

• 
• 
• 
• 

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

NGSS.HS-PS3-1

Energy can neither be ​​​ (a)   nor ​ (b)   only ​ (c)  

• created
• destroyed
• transformed

Tags

NGSS.HS-PS3-4

Which equation describes the conservation of energy?

• K1 + U1 = K2 + U2

• W = Fd

• K = 1/2 mv^2

• U = mgh

Which equation describes work done?

• K1 + U1 = K2 + U2

• U = mgh

• K = 1/2 mv^2

Tags

NGSS.HS-PS2-1

A car initially at rest accelerates at 10 m/s^2. The car’s speed after it has traveled 25 meters is most nearly

• 0 m/s

• 10 m/s

• 22 m/s

• 25 m/s

Tags

NGSS.HS-PS2-1

In one experiment, a student rolls a 2 kg ball such that it collides with a wall with a force of 10,000 N. In a second experiment, the student rolls a 5 kg ball such that it collides with the wall at a force of 5000 N. In both experiments, the balls bounce back from the wall and eventually come to rest. Which of the following statements is true regarding the force that the wall exerts on each ball?

• The wall exerts the same force on both balls since they both bounce back from the same wall in both experiments.

• The wall exerts a greater force on the 5 kg ball than on the 2 kg ball since a greater force is required to cause the heavier ball to bounce back from the wall.

• The wall exerts a greater force on the 2 kg ball than on the 5 kg ball since the force from the wall on each ball is equal to the force that each ball exerts on the wall.

• The answer cannot be determined without knowing the distance each ball rolls before coming to rest.

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

An astronaut in deep space is at rest relative to a nearby space station. The astronaut needs to return to the space station. A student makes the following claim: “The astronaut should position her feet pointing away from the space station. Then, she should repeatedly move her feet in the opposite direction to each other. This action will propel the astronaut toward the space station.” Is the student’s claim correct? Justify your selection.

• Yes. The astronaut’s feet exert a force away from the space station, creating an equal and opposite force that will accelerate the astronaut toward the space station.

• Yes. The astronaut’s feet will have a velocity that is transferred to her center of mass, accelerating the astronaut toward the space station.

• No. The astronaut’s feet are not exerting a force on another object, so there is no external force to accelerate the astronaut toward the space station.

• No. The astronaut would move away from the space station, not toward it, since her feet are pointed away from the space station.

Tags

NGSS.HS-PS2-1