Question 1

A high school science lab recently misplaced all of their triple beam balances. An experiment requires the students to know the mass of a particular object. The lab has digital force and acceleration sensors that students use to generate the graph below.
What is the mass of the object according to the Acceleration-Force graph shown above?

Accepted Answer

20 kg

Answer

0.05 kg

Answer

40 kg

Answer

2 kg

Question 2

A strength and conditioning coach recommends that an athlete train by pulling a large amount of mass while sprinting.
If action-reaction forces are always equal and opposite, which explanation best describes the action-reaction pair acting on the runner shown above?

Accepted Answer

The runner will accelerate forward because the applied force exerted by the runner
creates an equal and opposite frictional force by the ground, but these forces are
exerted on different objects.

Answer

The runner will accelerate forward because the force of friction by the mass on the
runner is always less than the applied force by the runner, resulting in a net force
forward.

Answer

The runner will not move because the applied force exerted by the runner on the mass
will create an equal and opposite frictional force, canceling the applied force.

Answer

The runner will remain motionless because the applied force by the runner in the forward
direction is less than the frictional force from the ground acting in the opposite direction.

Question 3

A book is at rest on a level table as shown below.
Refer to the above image. Which best represents the action-reaction force that allows the book to remain at rest?

Accepted Answer

The action force is the gravitational force pulling the book downward towards the table and the reaction force is the normal force of the table pushing the book upwards.

Answer

The action force is the gravitational force pulling the book downward towards the
table, and the reaction force is the friction between the book and the table.

Answer

The action force is friction between the book and the table, and the reaction force is the
gravitational force pulling the book downward towards the table.

Answer

The action force is the normal force of the table pushing the book upwards, and the
reaction force is the gravitational force pulling the book downward towards the table.

Question 4

During a lab, a student rolls a ball down the hallway. The position vs. time graph below shows the position of the ball at different times.
  
According to the information and graph above, which force is most responsible for the decrease in velocity over time?

Accepted Answer

Frictional force

Answer

Spring force

Answer

Normal force

Answer

Gravitational force

Question 5

A ball is left in the cabin of an airplane. When the plane accelerates forward, the passengers remain in their seats, and the ball rolls to the back of the cabin.
According to the information and diagram shown above, what happens to the ball when the plane stops?

Accepted Answer

The ball rolls to the front of the cabin.

Answer

The ball continues moving backward just as it was when the plane was accelerating
forward.

Answer

The ball’s inertia keeps it from moving forward.

Answer

The ball accelerates toward the back of the plane with a higher magnitude.

Question 6

A pickup truck is capable of producing 515 N•m of torque. How much force does the engine
produce if the force acts 0.25 m from the pivot point?

Accepted Answer

2060 N

Answer

128.75 N

Answer

20.6 N

Answer

515.25 N

Question 7

NASA is concerned about the ability of a future lunar outpost to store the supplies necessary to support the astronauts. The supply storage area of the lunar outpost, where gravity is 1.63 m/s , can only support 1 x 10 N. 
What is the maximum weight of supplies, as measured on Earth, NASA should plan on sending to the lunar outpost?

Accepted Answer

601,000 N

Answer

61,300 N

Answer

100,000 N

Answer

16,300 N

Question 8

A student is pushing her car to the nearest gas station applying a force of ‘F’ on the car with a mass of ‘m’, resulting in an acceleration of ‘a.’ A friend stops to help push the car, thus doubling the force applied. 
Which expression best represents the acceleration of the car after her friend begins to push?

Accepted Answer

2a

Answer

g

Answer

a

Answer

a/2

Question 9

A man (100 kg) and his son (50 kg) are trapped in the middle of a frozen pond (a frictionless surface). The man and his son decide to push against each other and slide across the ice to the edge of the pond. 
Which of the following statements is true?

Accepted Answer

.Both will make it off of the pond, but the son will get there first.

Answer

Only the dad will make it off of the pond.

Answer

Both will make it off of the pond, but the man will get there first

Answer

Only the son will make it off of the pond

Question 10

A box is initially sliding across a level floor at 10 m/s before being subjected to the forces shown below.
According to the above information and diagram, which of the following best describes the motion of this object?

Accepted Answer

The box moves at a constant velocity.

Answer

The box accelerates to the right.

Answer

The box accelerates to the left.

Answer

The box is at rest

Question 11

A runner accelerates at 2 m/s  when subjected to the forces below.
According to the information and diagram above, what is the value of the frictional force on the runner?

Accepted Answer

300 N

Answer

700 N

Answer

0 N

Answer

500 N

Question 12

A force of 100 N is used to rotate a bolt using a 0.15 m long wrench as shown below.
According to the diagram above, what is the torque provided by the wrench?

Accepted Answer

15 N•m

Answer

99.85 N•m

Answer

0.0015 N•m

Answer

667 N•m

Question 13

A car is initially travelling with a positive constant velocity before being subjected to the forces below.
What is the magnitude of acceleration of the car as described by the above free body  diagram?

Accepted Answer

4.9 m/s^2

Answer

500 m/s^2

Answer

0.5 m/s^2

Answer

None of these

Question 14

The illustration below shows the direction of forces on an automobile as it moves in a straight line.
If the drag force (due to a gust of wind) increases, yet remains less than the applied force,
which of the following describes the motion of the automobile above? (Note: The magnitudes are not drawn to scale.)

Accepted Answer

The car’s magnitude of velocity will increase.

Answer

The car will maintain a constant velocity.

Answer

The car will rotate about the center of mass.

Answer

The car’s magnitude of velocity will decrease.

Question 15

A box is initially sliding across a level floor at 10 m/s before being subjected to the forces shown below.
Refer to the above information and diagram. What is the sum of forces for this FBD?

Accepted Answer

0 N

Answer

20 N

Answer

200 N

Answer

120 N

Question 16

The diagram represents a truck on a hill as it skids to a stop.
The gravitational force on the truck has been resolved into components parallel (Fgp) and normal (FgN) to the ramp. The components of Fg have been included in the free body diagram.
Use information in the diagram above to calculate the acceleration of the skidding truck. Which of the following is equal to the magnitude of the acceleration of the truck coming to a stop?

Accepted Answer

5.0 m/s^2

Answer

10.0 m/s^2

Answer

0.0 m/s^2

Answer

15.0 m/s^2

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