MCQ Test Review

Rock is released from rest at the top of a cliff that is on Earth. A short time later, Rock is released from rest

from the same location as Rock . Both rocks fall for several seconds before landing on the ground directly below

the cliff. Frictional forces are considered to be negligible.

Which of the following graphs correctly shows the vertical velocity of rock as a function of time? Take

the positive direction to be upward.

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Which of the following graphs best represents the vertical displacement of Rock as a function of time starting from immediately after the rock is released from rest? Take the positive direction to be downward.

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After Rock is released from rest several seconds after Rock is released from rest, what happens to the separation distance between the rocks as they fall but before they reach the ground, and why? Take the positive direction to be downward.

• is constant because at the moment Rock is released, the only difference between the rocks is their difference in height above the ground.

• is constant because the difference in speed between the two rocks stays constant as they fall.

• increases because the difference in speed between the two rocks increases as they fall.

• increases because at all times Rock falls with a greater speed than Rock.

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Toy car travels across a horizontal surface with acceleration after starting from rest. A toy car travels across the same surface toward a car with acceleration after starting from rest. The car is separated from a car by a distance. Which of the following pairs of equations could be used to determine the location on the horizontal surface where the two cars will meet, and why?

• X=Xo +VoXt+1/2Axt^2 for car W, and X=Xo+Voxt+1/2Axt^2 for car Z. Since the cars will meet at the same time, solving for in one equation and placing the new expression for into the other equation will

  eliminate all unknown variables except.

• X=Xo +VoXt+1/2Axt^2 for car W, and ∆X=X-Xo for a car Z. Since the separation distance is known between both cars, the displacement for a car Z can be used in the equation for car W so that the time at which the cars meet can be determined. Once known, the time can be used to determine the meeting location.

• ∆X=X-Xo for car W, and X=Xo +VoXt+1/2Axt^2 for a car Z. Since the separation distance is known between both cars, the displacement for a car W can be used in the equation for a car Z so that the time at which the cars meet can be determined. Once known, the time can be used to determine the meeting location.

• ∆X=X-Xo for car W, and ∆X=X-Xo for car Z Since the location at which the cars meet represents the final position of both cars, the separation distance for both cars can be substituted into both equations to determine the final position of both cars.

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A ball traveling at a speed rolls off a desk and lands at a horizontal distance away from the desk, as shown in the figure. The ball is then rolled off of the same desk at a speed of. At what horizontal distance will the ball land from the table?

• Xo

• 3Xo

• 6Xo

• 9Xo

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NGSS.HS-PS2-1

A student drops a rock from rest at a distance h above the ground such that the rock hits the ground at time to. At what distance above the ground should the rock be dropped such that it hits the ground at a time 2to after it is released from rest?

• h

• 2h

• 3h

• 4h

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An object travels along a straight, horizontal surface with an initial speed of . The position of the object as a function of time is given in the table. Which of the following graphs represents the object’s velocity as a function of time?

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NGSS.HS-PS2-1

An object travels along a straight, horizontal surface with an initial speed of . The velocity of the object as a function of time is given in the table above. Which of the following graphs represents the object’s acceleration as a function of time?

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NGSS.HS-PS2-1

Two objects, object X and object Y , are held together by a light string and are released from rest near a planet’s surface in the orientation that is shown in the figure. Object X has a greater mass than object Y . A graph of the acceleration as a function of time for the system’s center of mass is shown for the 4s. The positive direction is considered to be upward. How does the speed of object Xvx compare to that of the system’s speed Vs after the objects have fallen for 4s?

• Vx=Vs

• Vx>Vs

• Vx<Vs

• The answer cannot be determined without knowing the relative masses of object X and object Y.

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NGSS.HS-PS2-1

A student uses a motion sensor to collect data of the velocity of an object as a function of time during two experimental trials, as shown. In which trial does the object have the greatest magnitude of acceleration, and in which trial does the object travel the greatest distance?

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NGSS.HS-PS2-1