Question 1

A muscle that generates most of its force directed back into the joint is producing which type of force?&#10;A) Angular force&#10;B) Stabilizing force&#10;C) Dislocating force&#10;D) Force couple

Accepted Answer

A muscle that generates force directed back into the joint is producing a stabilizing force. This type of force helps to support and stabilize the joint, as opposed to creating movement (angular force), causing instability (dislocating force), or creating movement through multiple joints (force couple).

Question 2

The reason that a large-handled object is easier to turn is that the mechanical advantage is larger.
Multiple Choice
Identify the choice that best completes the statement or answers the question.

True

Accepted Answer

When the handle is larger, the distance from the axis of rotation to where the force is applied is greater, creating a larger lever arm and thus increasing the mechanical advantage.

Question 3

If a PTA wishes to manually resist the knee extensors for an athlete and wishes to make the exercise as difficult as possible for the client,the best placement of her hand would be which of the following?

A) Proximal to the knee joint
B) Just distal to the tibial tuberosity
C) Midpoint of the tibia
D) Just proximal to the talus

D

Accepted Answer

Placing the resistance just proximal to the talus increases the lever arm, making the exercise more challenging for the knee extensors.

Question 4

In order to increase the challenge of a person working on balance,you could do which of the following?&#10;A) Raise the center of gravity and increase the base of support&#10;B) Raise the center of gravity and decrease the base of support&#10;C) Lower the center of gravity and increase the base of support&#10;D) Lower the center of gravity and decrease the base of support

Accepted Answer

By raising the center of gravity and decreasing the base of support, the individual must engage more muscles and focus on their balance in order to maintain stability. This increases the challenge of the activity and can help improve balance over time.

Question 5

Two forces acting in equal but opposite directions and resulting in a turning effect is called a&#10;A) stabilizing force.&#10;B) dislocating force.&#10;C) moment of force.&#10;D) force couple.

Accepted Answer

Two forces acting in equal but opposite directions and resulting in a turning effect is called a force couple. The other options either do not accurately describe the situation or are not relevant to the concept being described.

Question 6

In order to decrease the challenge of a client working on balance,you would do which of the following?&#10;A) Raise the center of gravity and increase the base of support&#10;B) Raise the center of gravity and decrease the base of support&#10;C) Lower the center of gravity and increase the base of support&#10;D) Lower the center of gravity and decrease the base of support

Accepted Answer

Lowering the center of gravity and increasing the base of support will make it easier for the client to maintain their balance. This can be achieved by having the client lower their stance, widen their feet, or use assistive devices such as a cane or walker. Raising the center of gravity and decreasing the base of support would make it harder for the client to maintain their balance.

Question 7

The law of motion best demonstrated when a person in a wheelchair gains speed when she pushes on the rims is the&#10;A) law of inertia.&#10;B) law of acceleration.&#10;C) law of action-reaction.&#10;D) law of physics.

Accepted Answer

The wheelchair gaining speed when the person pushes on the rims is a demonstration of the law of acceleration, which states that the acceleration of an object is directly proportional to the force applied to it and inversely proportional to its mass.

Question 8

Most concentric exercises done in the body are considered to be which type of lever?&#10;A) First class&#10;B) Second class&#10;C) Third class&#10;D) Fourth class

Accepted Answer

Most concentric exercises in the body involve a third-class lever, which has the effort (muscle force) applied between the fulcrum (joint) and the resistance (weight being moved). Examples include bicep curls and hamstring curls.

Question 9

The type of machine that consists of a grooved wheel that turns on an axle with a rope or cable is a(n)&#10;A) movable pulley.&#10;B) wheel and axle.&#10;C) fixed pulley.&#10;D) inclined plane.

Accepted Answer

The answer of The type of machine that consists of...

Question 10

You are working with a client to regain function after shoulder surgery.Now you want to focus on exercises to increase power.You would choose which of the following exercises?&#10;A) Concentric strengthening&#10;B) Eccentric strengthening&#10;C) Stretches&#10;D) It doesn't matter; any of the above will help increase power.

Accepted Answer

The answer of You are working with a client to...

Question 11

The state of equilibrium demonstrated when an object's COG is unchanged when it is disturbed is&#10;A) stable equilibrium.&#10;B) unstable equilibrium.&#10;C) neutral equilibrium.&#10;D) None of the above

Accepted Answer

The answer of The state of equilibrium demonstrated when an...

Deck 8: Basic Biomechanics