Review Quiz Physics 1

The figure above shows a truck pulling three crates across a rough road. Which of the following shows the directions of all the horizontal forces acting on crate 2 ?

• $\leftarrow Rope\ \ Cable\rightarrow$

• $\frac{\leftarrow Rope}{\leftarrow Crate3}\ \ Cable\rightarrow$

• $\frac{\leftarrow Rope}{\frac{\leftarrow Crate3}{\leftarrow Friction}}\ \ \ Cable\rightarrow$

• $\frac{\leftarrow Rope}{\leftarrow friction}\ \ \ \ \frac{Cable\ \rightarrow}{Crate\ \rightarrow}$

Two blocks are on a horizontal, frictionless surface. Block A is moving with an initial velocity of v0 toward block B, which is stationary, as shown above. The two blocks collide, stick together, and move off with a velocity of 1/3 of v0 . Which block, if either, has the greater mass?

• Block A

• Block B

• Neither; their masses are the same.

• The answer cannot be determined without knowing the mass of one of the blocks.

A student sets an object attached to a spring into oscillatory motion and uses a motion detector to record the velocity of the object as a function of time. A portion of the recorded data is shown in the figure above.

The total change in the object’s speed between 1.0 s and 1.1 s is most nearly

• zero

• 5 cm/s

• 10 cm/s

• 15 cm/s

A student sets an object attached to a spring into oscillatory motion and uses a motion detector to record the velocity of the object as a function of time. A portion of the recorded data is shown in the figure above.

The acceleration of the object at time t = 0.7 s is most nearly equal to which of the following?

• The value of the graph where it crosses the 0.7 s grid line

• The slope of the line connecting the origin and the point where the graph crosses the 0.7 s grid line

• The area under the curve between where the graph crosses the time axis near 0.63 s and time 0.7 s

• The slope of the tangent to a best-fit sinusoidal curve at 0.7 s

A student sets an object attached to a spring into oscillatory motion and uses a motion detector to record the velocity of the object as a function of time. A portion of the recorded data is shown in the figure above.

The frequency of oscillation is most nearly

• 0.63 Hz

• 0.80 Hz

• 1.25 Hz

• 1.60 Hz

A box of mass m is initially at rest at the top of a ramp that is at an angle θ with the horizontal. The block is at a height h and length L from the bottom of the ramp. The block is released and slides down the ramp. The coefficient of kinetic friction between the block and the ramp is µ .

What is the kinetic energy of the box at the bottom of the ramp?

• mgh

• µmgL cos θ

• mgh - µmgL cos θ

• mgL - µmgh cos θ

During an experiment a student records the net horizontal force exerted on an object moving in a straight line along a horizontal frictionless track. The graph above shows the force as a function of time. Of the following, which is the best approximation of the magnitude of the change in momentum of the object between 0 s and 4 s?

• 20 kg ⋅ m/s

• 30 kg ⋅ m/s

• 40 kg ⋅ m/s

• The magnitude of the change in momentum cannot be determined without knowing the mass of the object.

The figure above shows the paths of two stars of equal mass as they orbit their common center of mass. The positions of the stars at four different times are labeled in the figure. At which of the positions do the stars have their greatest speed?

• Position 2 only

• Position 4 only

• Positions 1 and 3 only

• All of the positions, since the stars move with constant speed

A cylinder at rest is released from the top of a ramp, as shown above. The ramp is 1.0 m high, and the cylinder rolls down the ramp without slipping. At the bottom of the ramp, the cylinder makes a smooth transition to a small section of a horizontal table and then travels over the edge at a height of 1.0 m above the floor, eventually landing on the floor at a horizontal distance of 1.5 m from the table.

As the cylinder rolls down the ramp, how do the potential energy of the cylinder-Earth system and the kinetic energy of the cylinder change, if at all?

• Potential Energy of Cylinder-Earth System Stays the same

  Kinetic Energy of Cylinder Increases

• Potential Energy of Cylinder-Earth System Stays the same

  Kinetic Energy of Cylinder Decreases

• Potential Energy of Cylinder-Earth System Decreases

  Kinetic Energy of Cylinder Increases

• Potential Energy of Cylinder-Earth System Decreases

  Kinetic Energy of Cylinder Decreases

A cylinder at rest is released from the top of a ramp, as shown above. The ramp is 1.0 m high, and the cylinder rolls down the ramp without slipping. At the bottom of the ramp, the cylinder makes a smooth transition to a small section of a horizontal table and then travels over the edge at a height of 1.0 m above the floor, eventually landing on the floor at a horizontal distance of 1.5 m from the table.

After the cylinder leaves the table, but before it lands, how do the rotational kinetic energy and translational kinetic energy of the cylinder change, if at all?

• Rotational Kinetic Energy Increases

  Translational Kinetic Energy Increases

• Rotational Kinetic Energy Increases

  Translational Kinetic Energy Stays the same

• Rotational Kinetic Energy Stays the same

  Translational Kinetic Energy Increases

• Rotational Kinetic Energy Stays the same

  Translational Kinetic Energy Stays the same