BHK Biomechanics 3

Question 1

The concept of 'base of support' is critical to stability. Stability increases when:

Accepted Answer

Center of mass falls inside a wider base of support

Answer

Center of mass is raised higher

Answer

Base of support is narrowed

Answer

The line of gravity falls outside the base

Question 2

Impulse in biomechanics is defined as:

Accepted Answer

Force multiplied by time (F × Δt)

Answer

Force divided by time

Answer

Mass divided by velocity

Answer

Work done per unit distance

Question 3

Electromyography (EMG) in biomechanics is used primarily to:

Accepted Answer

Record the electrical activity of muscles to infer activation timing and relative intensity

Answer

Measure joint angles during movement

Answer

Quantify ground reaction forces

Answer

Calculate segment velocities

Question 4

In lifting biomechanics, the risk of low back injury is most influenced by:

Accepted Answer

The horizontal distance of the load from the body's center of mass

Answer

The color of the load

Answer

The symmetry of the load

Answer

The coefficient of friction of the floor

Question 5

The term 'elastic strain energy' in tendon biomechanics refers to:

Accepted Answer

Energy stored in a stretched tendon that can be released upon recoil

Answer

Heat released during rapid muscle contraction

Answer

The breaking strength of collagen fibers

Answer

The resting length-tension relationship of muscle

Question 6

A joint's 'closed-packed position' is defined as the position of maximum:

Accepted Answer

Congruence, ligament tension, and stability

Answer

Joint laxity and mobility

Answer

Synovial fluid secretion

Answer

Range of motion available