AP Physics 1 FINAL (Pt.1)

1 unit, because in one dimension vectors with opposite directions have opposite signs.

C

D

Car C

C>B>A

Yes, because the final velocity of the cart is equal to the initial velocity.

4m/s²

-20m/s

The transition between intervals between B and C

v2=2v0

cart 1

25m

Case 1 , because the toy has a greater displacement

The car is speeding up at a constant rate, then continues to speed up but at a slower constant rate

displacement

A student is riding on a bus that is traveling east at a constant speed. The student walks toward the front of the bus. A stationary observer outside the bus standing on the road claims that the student is moving faster than the bus. Is the claim correct? Why or why not

Yes, because according to the stationary observer, the student’s velocity is the velocity of the bus plus the velocity of the student relative to the bus.

6m/s

A rowboat moving in a lake is accelerating at a constant rate towards the shore. An observer in another boat moving at a constant velocity measures the row boat’s acceleration. A second observer, standing still on the shore, also measures the acceleration of the rowboat. Are the two accelerations measured by the two observers the same? Why or why not

Yes, because both observers are in inertial reference frames.

8.4 s

B

10m/s east

t

Yes, because the initial vertical components of the velocity are the same for both marbles.

left

10cm

C

1.7m

30m

10cm

decreases

10 N

To the right, because it will balance the leftward component of the force from the string

5 N

No, because the vertical components of the forces do not completely add to zero.

The vertical forces are unbalanced.

In which of the following free-body diagrams is the magnitude of the vector sum of the forces the greatest?

2 N

Yes, because the person and the step create an interacting force pair.

None of the four forces are an interacting force pair because all four forces are exerted on the same object.

The magnitude of the force that the hammer exerts on the nail is equal to the magnitude of the force that the nail exerts on the hammer.

No, because there is a downward net force on the astronaut.

The velocity of the box changes because the sum of the horizontal components of the forces no longer equals zero.

D

The velocity of the box changes because the sum of the horizontal components of the forces no longer equals zero.

The puck will slide with a constant velocity.

To the left only, because the vertical components of the forces are balanced, but the horizontal components are not balanced.

A spacecraft in deep space fires its thruster, which ejects fuel from the spacecraft. The ejected fuel exerts a constant force on the spacecraft and the total mass of the spacecraft decreases at a constant rate. Which of the following graphs best represents the acceleration of the spacecraft as a function of time while the thruster is firing?

Two stars in deep space are very far from any other objects. The two stars orbit the center of mass of the two-star system in circular orbits at constant speed. Which of the following claims is correct about the motion of the center of mass of the two-star system?

The center of mass does not accelerate.

The elevator could possibly be moving downward and slowing down.

There is a net force exerted on the system directed to the right.

2:3

Because distance scales near Earth’s surface are very small compared to Earth’s radius.

16F

2g