AP Physics C: Unit 3 Progress Check
Questions and correct answers
The figure shows an object moving from point B to point A and the gravitational potential
energy of the object-earth system at different points along the trajectory. There are no other
forces exerted on the object. Which of the following best describes the direction of the force
extended on the object due to the gravitational field as the object moves along the path from
point B to point A? (diagram included in question) ✅✅C) The force is always directed
downwards.
The magnitude of the force associated with the gravitational field is constant and has a value
F. A particle is launched from point B with an initial velocity and reaches point A having
gained U0 joules of kinetic energy. A resistive force field is now set up such that is directed
opposite the gravitational field with a force of constant magnitude 1/2F. A particle is again
launched from point B. How much Kinetic energy will the particle gain as it moves from
point B to point A? ✅✅B) 1/2Uo
A particle moves under the influence of a conservative force. The graph shows the potential
energy U as a function of position z. Which of the following graphs best shows the force F
, exerted on the particle as a function of x? (graph included in question) ✅✅D) (Since there
is only an image, I will describe it / send you what it looks like)
the first part is flat, then it goes from increasing to then decreasing. after it hits a certain
point, it goes back up to increasing and then goes flat.
For the section of the graph where 8 < x < 12, the equation for the potential energy as a
function of position is U(x) = 1/2xˆ2 - 10x + 54. The force exerted on the particle when the
particle is at x = 11 m is most nearly ✅✅B) -1N
In the lab setup above, block 1 is being pulled across a smooth surface by a light string
connected across a pulley to a falling block 2. The pulley has negligible mass and friction.
Students measure the mass of each block, the distance from A to B, and the speeds of the
block on the surface at points A & B. Which of the following hypotheses can be tested with
this setup? (diagram included in question) ✅✅D) As block 1 moves from point A to point
B, the work done by gravity on block 2 is equal to the change in the kinetic energy of the
two-block system.
Questions and correct answers
The figure shows an object moving from point B to point A and the gravitational potential
energy of the object-earth system at different points along the trajectory. There are no other
forces exerted on the object. Which of the following best describes the direction of the force
extended on the object due to the gravitational field as the object moves along the path from
point B to point A? (diagram included in question) ✅✅C) The force is always directed
downwards.
The magnitude of the force associated with the gravitational field is constant and has a value
F. A particle is launched from point B with an initial velocity and reaches point A having
gained U0 joules of kinetic energy. A resistive force field is now set up such that is directed
opposite the gravitational field with a force of constant magnitude 1/2F. A particle is again
launched from point B. How much Kinetic energy will the particle gain as it moves from
point B to point A? ✅✅B) 1/2Uo
A particle moves under the influence of a conservative force. The graph shows the potential
energy U as a function of position z. Which of the following graphs best shows the force F
, exerted on the particle as a function of x? (graph included in question) ✅✅D) (Since there
is only an image, I will describe it / send you what it looks like)
the first part is flat, then it goes from increasing to then decreasing. after it hits a certain
point, it goes back up to increasing and then goes flat.
For the section of the graph where 8 < x < 12, the equation for the potential energy as a
function of position is U(x) = 1/2xˆ2 - 10x + 54. The force exerted on the particle when the
particle is at x = 11 m is most nearly ✅✅B) -1N
In the lab setup above, block 1 is being pulled across a smooth surface by a light string
connected across a pulley to a falling block 2. The pulley has negligible mass and friction.
Students measure the mass of each block, the distance from A to B, and the speeds of the
block on the surface at points A & B. Which of the following hypotheses can be tested with
this setup? (diagram included in question) ✅✅D) As block 1 moves from point A to point
B, the work done by gravity on block 2 is equal to the change in the kinetic energy of the
two-block system.
