Free Practice Quiz Question List

2 Mechanics of the Body Online Quiz Questions

Use this free practice quiz with 20 questions to review 2 Mechanics of the Body, test your knowledge, and prepare for your next test or exam.

20 questions

True or false

1 point

A body moving at constant velocity has zero net force acting on it. True or false?

A
True
B
False

Choose one

1 point

A student is analyzing the forces on a forearm holding a weight. What should the student do first when drawing a free-body diagram?

A
Draw the whole body and show only the motion of its parts.
B
Isolate the object being analyzed and show all forces acting on it.
C
Show only the forces produced by muscles.
D
Show the object’s internal tissues but omit external forces.

Choose one

1 point

When calculating the torque of a force about a joint, which distance is the lever arm?

A
The distance measured along the limb from the pivot to the point where force is applied.
B
The perpendicular distance from the pivot to the force’s line of action.
C
The total length of the limb, regardless of where the force acts.
D
The distance between the force’s application point and the body’s centre of mass.

Fill in the blank

1 point

During movement, muscles create tension that is transmitted to bones through .

True or false

1 point

If a tissue deforms elastically under a load, the deformation is largely reversed when the load is removed.

A
True
B
False

Choose all

1 point

Select all statements that accurately describe the mechanical roles of these medical devices.

A
Crutches and canes can provide external support and change how forces are distributed.
B
Prosthetic limbs transmit loads while providing useful movement.
C
Orthoses and braces can guide or limit joint motion and transmit forces.
D
All three device types directly measure internal joint forces.

Written response

1 point

A force of $12\,\text{N}$ acts perpendicular to a limb at a point $0.25\,\text{m}$ from a joint. What torque does it produce about the joint? Enter the value in N·m.

Choose one

1 point

A clinician considers both a sudden impact and many repeated lower loads when assessing possible tissue injury. Which conclusion is supported?

A
Only the direction of a load matters; its size and duration do not.
B
Both the peak load from a sudden impact and repeated loading can matter.
C
Repeated loading cannot contribute to tissue injury if each load is small.
D
A tissue’s response is fully predicted by one elastic-modulus value.

Fill in the blank

1 point

For a uniform tensile load, the resulting relative deformation is called .

Written response

1 point

A uniform force of $600\,\text{N}$ acts over an area of $0.03\,\text{m}^2$ . What stress does this produce? Enter the value in Pa.

Choose all

1 point

Many muscles attach close to a joint, giving them a shorter lever arm than the external load they move. Select all consequences of this arrangement described in biomechanics.

A
The muscle may need to exert much more force than the external load’s force.
B
The arrangement can allow large, rapid limb movements.
C
The muscle necessarily produces less torque than the external load.
D
The external load’s lever arm becomes irrelevant.

Choose one

1 point

Two materials are in their linear elastic ranges and experience the same stress. What does a higher Young’s modulus indicate about one material compared with the other?

A
It means the material experiences greater strain for the same stress.
B
It means the material must be direction-independent and time-independent.
C
It means the material deforms less for the same stress within the linear elastic range.
D
It means the material cannot undergo permanent deformation.

Open ended

1 point

A clinician is evaluating a cane for a person who needs support while walking. Explain how the cane changes mechanical support or force distribution, and identify one mechanical design or fitting consideration.

True or false

1 point

True or false: A sudden impact can create a high peak load, and repeated loading can also contribute to tissue injury.

A
True
B
False

Choose one

1 point

A person uses crutches to support themselves while walking. Which description best explains the mechanical role of the crutches?

A
They eliminate the forces acting on the legs and ground.
B
They provide external support and change how forces are distributed among the hands, arms, legs, and ground.
C
They prevent all motion at the joints.
D
They reduce every force on the body to zero.

Choose one

1 point

A tissue deforms under a load, but the load stays within the tissue’s elastic range. What is the most likely result when the load is removed?

A
The deformation is largely reversed when the load is removed.
B
The deformation must remain permanent.
C
The tissue must fail immediately.
D
The tissue cannot deform while loaded.

Choose one

1 point

When beginning a mechanical analysis of a forearm holding a weight, what should a free-body diagram do?

A
Show only the forces produced by muscles, because external forces are not relevant.
B
Show the object together with every nearby object, without marking forces.
C
Isolate the object and show all forces acting on it.
D
Show the object’s motion but omit forces that balance one another.

Choose one

1 point

Two materials experience the same stress while remaining in their linear elastic ranges. What does it imply if material A has a higher Young’s modulus than material B?

A
It means the material experiences greater deformation at the same stress.
B
It means the material experiences less deformation at the same stress.
C
It means the material has no elastic range.
D
It means the material’s strain has units of pascals.

Written response

1 point

A uniform tensile force of $600\ \mathrm{N}$ acts over an area of $0.002\ \mathrm{m}^2$ . What is the stress? Enter the numerical value in Pa.

Written response

1 point

A perpendicular force of $18\ \mathrm{N}$ acts $0.25\ \mathrm{m}$ from a joint. What torque does it produce about the joint? Enter the numerical value in N·m.