Physics AP Final Yo Exam questions and answers
Graded A+
*graph*
An object is moving in the positive x direction while a net force directed along the
x axis is exerted on the object. The figure above shows the force as a function of
position. What is the net work done on the object over the distance shown? -
✅✅F.d
*circle diagram*
The diagram above shows a top view of a child of mass M on a circular platform of
mass 2M that is rotating counterclockwise. Assume the platform rotates without
friction. Which of the following describes an action by the child that will increase
the angular speed of the platform-child system and gives the correct reason why?
- ✅✅The child moves toward the center of the platform, decreasing the
rotational inertia of the system.
*forces figure*
The figure above shows the forces exerted on a block that is sliding on a
horizontal surface: the gravitational force of 40 N, the 40 N normal force exerted
by the surface, and a frictional force exerted to the left. The coefficient of friction
between the block and the surface is 0.20. The acceleration of the block is most
nearly - ✅✅2.0 m/s^2 to the left
*V/t graph*
A student on another planet has two identical spheres, each of mass .6 kg
attached to the ends of a rod of negligible mass. The student gives the assembly a
rotation in the vertical plane and then releases it so it falls, as shown in the top
figure above. Sensors record the vertical velocity of the two spheres, and the data
, is show in the graph of velocity v as a function of time t. Another student wants to
calculate the assembly's angular speed and the change in the linear momentum
of the center of mass of the assembly between 0 sec and 0.3 sec. Which of these
quantities can be determined using the graph? - ✅✅Angular speed and change
in linear momentum
*spring and block*
A block of known mass hanging from an ideal spring of known spring constant is
oscillating vertically. A motion detector records the position, velocity, and
acceleration of the block as a function of time. Which of the following indicates
the measured quantities that are sufficient to determine whether the net force
exerted on the block equals the vector sum of the individual forces? -
✅✅Acceleration and position only
*modified Atwood's machine*
Block A hangs from a light string that passes over a light pulley and is attached to
block B, which is on a level horizontal frictionless table as shown above. Students
are to determine the mass of block B from the motion of the two-block system
after it is released from rest. They plan to measure the time block A takes to reach
the floor. The students must also take which of the following measurements to
determine the mass of block B? - ✅✅Only the mass of block A and the distance
block A falls to reach the floor
*two ramps pic*
Two objects are released from rest at the top of ramps from the same
dimensions, as shown in the figure above. The sphere rolls down one ramp
without slipping. The small block slides down the other ramp without friction.
Which object reaches the bottom of its ramp first, and why? - ✅✅The block,
because it does not gain rotational kinetic energy, but the sphere does
Graded A+
*graph*
An object is moving in the positive x direction while a net force directed along the
x axis is exerted on the object. The figure above shows the force as a function of
position. What is the net work done on the object over the distance shown? -
✅✅F.d
*circle diagram*
The diagram above shows a top view of a child of mass M on a circular platform of
mass 2M that is rotating counterclockwise. Assume the platform rotates without
friction. Which of the following describes an action by the child that will increase
the angular speed of the platform-child system and gives the correct reason why?
- ✅✅The child moves toward the center of the platform, decreasing the
rotational inertia of the system.
*forces figure*
The figure above shows the forces exerted on a block that is sliding on a
horizontal surface: the gravitational force of 40 N, the 40 N normal force exerted
by the surface, and a frictional force exerted to the left. The coefficient of friction
between the block and the surface is 0.20. The acceleration of the block is most
nearly - ✅✅2.0 m/s^2 to the left
*V/t graph*
A student on another planet has two identical spheres, each of mass .6 kg
attached to the ends of a rod of negligible mass. The student gives the assembly a
rotation in the vertical plane and then releases it so it falls, as shown in the top
figure above. Sensors record the vertical velocity of the two spheres, and the data
, is show in the graph of velocity v as a function of time t. Another student wants to
calculate the assembly's angular speed and the change in the linear momentum
of the center of mass of the assembly between 0 sec and 0.3 sec. Which of these
quantities can be determined using the graph? - ✅✅Angular speed and change
in linear momentum
*spring and block*
A block of known mass hanging from an ideal spring of known spring constant is
oscillating vertically. A motion detector records the position, velocity, and
acceleration of the block as a function of time. Which of the following indicates
the measured quantities that are sufficient to determine whether the net force
exerted on the block equals the vector sum of the individual forces? -
✅✅Acceleration and position only
*modified Atwood's machine*
Block A hangs from a light string that passes over a light pulley and is attached to
block B, which is on a level horizontal frictionless table as shown above. Students
are to determine the mass of block B from the motion of the two-block system
after it is released from rest. They plan to measure the time block A takes to reach
the floor. The students must also take which of the following measurements to
determine the mass of block B? - ✅✅Only the mass of block A and the distance
block A falls to reach the floor
*two ramps pic*
Two objects are released from rest at the top of ramps from the same
dimensions, as shown in the figure above. The sphere rolls down one ramp
without slipping. The small block slides down the other ramp without friction.
Which object reaches the bottom of its ramp first, and why? - ✅✅The block,
because it does not gain rotational kinetic energy, but the sphere does
