BHK Biomechanics

Question 1

Newton's second law of motion as applied to biomechanics states that:

Accepted Answer

Force equals mass times acceleration (F = ma)

Answer

Every action has an equal and opposite reaction

Answer

A body in motion stays in motion unless acted upon

Answer

An object at rest stays at rest

Question 2

In biomechanics, torque is defined as:

Accepted Answer

The rotational effect of a force about an axis, equal to force times moment arm

Answer

The linear force applied along a limb

Answer

The force per unit area on a joint surface

Answer

The total kinetic energy of a rotating segment

Question 3

The center of mass of the human body in anatomical position is located approximately:

Accepted Answer

Just anterior to the second sacral vertebra

Answer

At the navel level

Answer

At the xiphoid process

Answer

At the hip joint

Question 4

Which type of lever system is most common in the human body?

Accepted Answer

Third class

Answer

First class

Answer

Second class

Answer

Fourth class

Question 5

Ground reaction force (GRF) during normal walking has a characteristic double-hump pattern. What does each hump represent?

Accepted Answer

Heel strike and push-off forces

Answer

Left and right leg forces combined

Answer

Vertical and horizontal components

Answer

Stance and swing phase forces

Question 6

Angular momentum is conserved when:

Accepted Answer

Net external torque acting on a system is zero

Answer

Net linear force is zero

Answer

The body's center of mass is stationary

Answer

Gravitational force is eliminated