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AP Physics

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Section 1

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A student is asked to move a box from ground level to the top of a loading dock platform, as shown in the figures above. In Figure 1, the student pushes the box up an incline with negligible friction. In Figure 2, the student lifts the box straight up from ground level to the loading dock platform. In which case does the student do more work on the box and why?

Front

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6 years ago

Date created

Mar 1, 2020

Cards (13)

Section 1

(13 cards)

A student is asked to move a box from ground level to the top of a loading dock platform, as shown in the figures above. In Figure 1, the student pushes the box up an incline with negligible friction. In Figure 2, the student lifts the box straight up from ground level to the loading dock platform. In which case does the student do more work on the box and why?

Front

Neither method, because the work is the same in both cases, since using the ramp decreases the force

Back

A student is asked to move a box from ground level to the top of a loading dock platform, as shown in the figures above. In Figure 1, the student pushes the box up an incline with negligible friction. In Figure 2, the student lifts the box straight up from the ground level to the loading dock platform. In which case does the student do more work on the box, and why?

Front

Neither method, because the work is the same in both cases, since using the ramp decreases the force by the same factor that it increases the distance.

Back

A 12 kg box sliding on a horizontal floor has an initial speed of 4.0 m/s. The coefficient of friction between the box and the floor is .20. The box moves a distance of 4.0 m in 2.0 s. The magnitude of the change in momentum of the box during this time is most nearly...

Front

48 kg•m/s

Back

A student sets an object attached to a spring into oscillatory motion and uses a position sensor to record the displacement of the object from equilibrium as a function of time. A portion of the recorded data is shown in the figure above. The total distance traveled by the object between 0.35 s and 0.40 s is most nearly

Front

2 cm

Back

Two charged conducting spheres are separated by a distance d, as shown in the figure above. One sphere has charge +5Q, the other has charge -Q, and the diameter of each sphere is much smaller than d. Each sphere exerts a force of magnitude F on the other. The spheres are brought together and touch briefly. After touching, the left sphere has charge +2Q. The spheres are then returned to their original locations. What is the magnitude of the new force between the spheres?

Front

4/5 F

Back

An object is moving to the west at a constant speed. Three forces are exerted on the object. One force is 10 N directed due north, and another is 10 N directed due west. What is the magnitude and direction of the third force if the object is to continue moving to the west at a constant speed?

Front

10_/2 N, directed southeast

Back

Block A of mass 2.0 kg is released from rest at the top of a 3.6 m long plane inclined at an angle of 30 degrees, as shown in the figure above. After sliding on the horizontal surface, block A hits and sticks to block B, which is at rest and has mass 3.0 kg. Assume friction is negligible. The speed of the blocks after the collision is most nearly

Front

2.4 m/s

Back

A sled slides down a hill with friction between the sled and hill but negligible air resistance. Which of the following must be correct about the resulting change in energy of the sled-Earth system?

Front

The sum of the kinetic energy and the gravitational potential energy changes by an amount equal to the energy dissipated by friction.

Back

A student sets an object attached to a spring into oscillatory motion and uses a position sensor to record the displacement of the object from equilibrium as a function of time. A portion of the recorded data is shown in the figure above. The frequency of oscillation is most nearly

Front

2.0 Hz

Back

A blue sphere and a red sphere with the same diameter are released from rest at the top of a ramp. The red sphere takes a longer time to reach the bottom of the ramp. The spheres are then rolled off a horizontal table at the same time with the same speed and fall freely to the floor. Which sphere reaches the floor first?

Front

Neither; the spheres reach the floor at the same time.

Back

A rubber ball with mass .20 kg is dropped vertically from a height of 1.5 m above a floor. The ball bounces off of the floor, and during the bounce .60 J of energy is dissipated. What is the maximum height of the ball after the bounce?

Front

1.2 m

Back

The figure above shows two wave pulses on a spring traveling toward each other at time t=0. At t=.02 s the pulses completely overlap. A student measures the amplitudes at points A, B, and C at the three times shown in the table. Which of the following is the most likely set of values that the student recorded for x, y, and z in the table?

Front

x-.5m. y-.3m. z-.2m

Back

A student sets an object attached to a spring into oscillatory motion and uses a position sensor to record the displacement of the object from equilibrium as a function of time. A portion of the recorded data is shown in the figure above. The speed of the object at time t=0.65 s is most nearly equal to which of the following?

Front

The slope of the tangent to a best-fit sinusoid curve at 0.65 s

Back