AP Physics 1: Algebra-Based Practice Quiz: Work

Correct Answer: B

Content point 2 states, "Work is the amount of energy transferred into or out of a system by a force exerted on that system over a distance."

Correct Answer: D

Content point 5 explicitly states, "Work is a scalar quantity that may be positive, negative, or zero."

Correct Answer: C

Content point 7 states, "The work-energy theorem states that the change in an object's kinetic energy is equal to the sum of the work (net work) being done by all forces exerted on the object."

Correct Answer: C

Content point 3 states that the work done by a conservative force is "path-independent and only depends on the initial and final configurations of that system." Since the initial and final points (A and B) are the same, the work done is the same regardless of the path taken.

Correct Answer: C

Content point 4 clearly states, "Potential energies are associated only with conservative forces."

Correct Answer: B

Content point 8 states, "Work is equal to the area under the curve of a graph of $F_{||}$ as a function of displacement."

Correct Answer: C

Content point 2 defines work as energy transfer. Content point 5 notes that work can be positive, negative, or zero. Positive work corresponds to energy transferred into a system, while negative work corresponds to energy transferred out of the system.

Correct Answer: B

Content point 6 states, "The amount of work done on a system by a constant force is related to the components of that force and the displacement of the point at which that force is exerted."

Correct Answer: C

According to the work-energy theorem (Content point 7), the change in kinetic energy is equal to the net work. If the net work is positive, the change in kinetic energy must also be positive, meaning the kinetic energy increases.

Correct Answer: B

Content point 3 states that work done by a conservative force is path-independent. Since the work done by F1 is the same for two different paths between the same two points, F1 must be conservative. Since the work done by F2 depends on the path, it must be non-conservative.

Correct Answer: C

Content point 7 defines the work-energy theorem in terms of "the sum of the work (net work) being done by all forces exerted on the object." This means net work is the algebraic sum of the work done by every force.

Correct Answer: B

A key property of a conservative force, derived from its path-independence (Content point 3), is that the work done over any closed path is zero. Because the initial and final configurations are the same, the work done by a conservative force must be zero.

Correct Answer: C

According to content point 8, work is the area under the force-displacement curve. The net work is the algebraic sum of the work done over each interval. Therefore, W_net = W_(0-5) + W_(5-10) = (+20 J) + (-15 J) = +5 J.

Correct Answer: C

Content point 2 defines work as energy transfer by a force exerted over a distance. If the displacement is zero, the work done is zero. According to the work-energy theorem (Content point 7), if the net work is zero, the change in kinetic energy is zero.

Correct Answer: B

Content points 1 and 2 describe work as something done on a system by forces over a distance, which is a process of energy transfer, not an inherent property of the system itself.