Question 1

Kinematics is concerned with the description of motion and includes consideration of each of the following except:

Accepted Answer

Kinematics focuses on the motion of objects, including aspects like time, displacement, and velocity, without considering the forces that cause the motion. Force is a concept related to dynamics, not kinematics.

Question 2

Which of the following does not describe a way in which machines function?

Accepted Answer

Machines function by balancing forces, enhancing range of motion and speed, and altering the direction of an applied force, but not by increasing the total force needed to overcome a resistance. Instead, they often aim to decrease the force needed by the user.

Question 3

-Which of the following is the most common form of simple machine found in the human body?

Accepted Answer

Levers are the most common form of simple machine found in the human body, with bones acting as bars, joints as pivots, and muscle contractions providing the force.

Question 4

In the context of the factors in use of anatomical levers, which of the following statements defines the term force arm?

Accepted Answer

The force arm is defined as the perpendicular distance between the location of force application and the axis of rotation. This distance influences the mechanical advantage and efficiency of the lever system in producing movement.

Question 5

-In the human body when the triceps applies a force to the olecranon in extending the non-supported forearm at the elbow, it exemplifies:

Accepted Answer

In the human body, the triceps applying force to the olecranon to extend the forearm at the elbow is an example of a first-class lever, where the fulcrum (elbow joint) is between the effort (triceps muscle) and the load (forearm).

Question 6

Which of the following exemplifies a second-class lever in the human body?

Accepted Answer

In a second-class lever, the load is located between the effort and the fulcrum. Plantar flexion of the ankle to raise the body on the toes is an example of this, where the ball of the foot acts as the fulcrum, the body weight acts as the load, and the effort is applied by the calf muscles.

Question 7

-Which of the following pairs of variables exhibits an inverse relationship?

Accepted Answer

In mechanics, both pairs exhibit an inverse relationship. For the force and the force arm, this is described by the principle of moments (torque = force x distance), where increasing the distance (force arm) can result in a decrease in the force needed to achieve the same torque. Similarly, for resistance and the resistance arm, a longer resistance arm means less force is needed to overcome the resistance, indicating an inverse relationship.

Question 8

Which of the following is a primary purpose of wheels and axles in the musculoskeletal system?

Accepted Answer

Wheels and axles in the musculoskeletal system, such as those found in joints, primarily enhance range of motion, allowing for smoother and more varied movements.

Question 9

-Which of the following statements accurately represents the relationship between linear and angular motion?

Accepted Answer

Angular motion at the joints is fundamental in creating the linear motion observed in activities like walking. This is because the rotation of limbs around joints translates into forward movement.

Question 10

Which of the following statements is true about velocity?

Accepted Answer

Velocity is defined as the rate at which an object changes its position, indicating both speed and direction of movement.

Question 11

-Newton's law of inertia states that:

Accepted Answer

Newton's law of inertia, also known as Newton's first law, states that an object at rest stays at rest and an object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force. This is accurately described in option B.

Question 12

Which of the following terms refers to the tendency for the current state of motion to be maintained, whether a body segment is moving at a particular velocity or is motionless?

Accepted Answer

Inertia is the property of a body to resist changes in its state of motion, whether it is at rest or moving at a constant velocity. This concept is fundamental in Newton's first law of motion.

Question 13

Identify Newton's law of acceleration.

Accepted Answer

Newton's second law of motion states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. This is reflected in choice C, which describes how a change in acceleration is directly related to the force applied.

Question 14

Which of the following terms is defined as the rate of change in velocity?

Accepted Answer

Acceleration is defined as the rate of change in velocity with respect to time.

Question 15

Identify Newton's law of reaction.

Accepted Answer

Newton's third law of motion states that for every action, there is an equal and opposite reaction. This principle explains how forces always come in pairs. When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body.

Question 16

Which of the following is a type of friction?

Accepted Answer

Static and kinetic are both types of friction. Static friction acts on objects that are not moving, while kinetic friction acts on objects that are sliding over a surface.

Question 17

Which of the following statements is true about kinetic friction?

Accepted Answer

Kinetic friction occurs between surfaces in relative motion, as described in option A. It contrasts with static friction, which acts on stationary objects, and is generally less than or comparable to static friction, not always greater as suggested in option C. Rolling friction, on the other hand, typically involves lower resistance than sliding friction, making option D incorrect.

Question 18

Which of the following statements is false about forces?

Accepted Answer

Forces are not relative to the mass of an object.

Question 19

Which of the following is not an example of forces that act individually or in combination to provide mechanical loading that may result in excessive tissue deformation?

Accepted Answer

Straightening is not typically classified among the forces that contribute to mechanical loading in the context of causing tissue deformation. The primary forces involved in such processes include compression, shear, and bending, each of which can lead to stress on tissues or materials.

Question 20

Which of the following statements is correct?

Accepted Answer

Static equilibrium is when the body is at rest or completely motionless.

Quiz 3: Basic Biomechanical Factors and Concepts