Kin 211 Ch 6

Biomechanics is limited to the realm of physical education and sport.

false

To have motion, _____.

the equilibrium of the body must be upset

Velocity refers to the speed and direction of a body and involves the change of position of a body per unit of time.

true

A distinct advantage of _____ is that it permits movement data to be recorded without encumbering a performer with wires and other equipment that can hinder performance.

Telemetry

Which of the following might be studied by biomechanists?

The design of a shoe to reduce incidences of foot sores for diabetics All of the answers are correct. (Correct answer) Forces exerted on the spine during lifting Optimal form during the javelin throw

Which of the following is measured in anthropometry?

The weight of the trunk The shape of the body The length of the forearm

The angle that is rotated in a given unit of time and is computed mathematically in terms of revolutions per second is known as _____.

angular velocity

____ is used to measure the electrical activity produced by a muscle or muscle group.

electromyography

A batter who wants to produce greater force will hold the very end of the bat.

false

According to Newton's first law, if the force acting on a body is insufficient to overcome inertia, movement will occur.

false

Body force is produced by the actions of the bones.

false

Exercise science is concerned with the anatomical and physiological elements that carry out movement, specifically bones, tissues, muscles, and nerves.

false

Kinetics focuses on studying the time and space factors involved in motion, such as velocity, whereas kinematics focuses on forces that act on a system, such as gravity and muscles.

false

Quantitative analysis relies on visual evaluation of the performer's movement.

false

The principle of conservation of momentum is most similar to which of Newton's laws of motion?

first

Newton's third law states that:

for every action there is an equal and opposite reaction.

Kinesiology is the subdiscipline of physical education that focuses on _____.

humans in sport moving efficiently and effectively

Persons practicing Tai Chi may adopt a wide stance in order to _____.

improve their balance increase their stability lower their center of gravity

According to Newton's second law, acceleration of an object:

is directly proportional to the force producing it and inversely proportional to the object's mass.

Anthropometry is concerned with the _____.

measurement of different segments of the human body

Principles and concepts related to stability, motion, leverage, and force play a significant role in many physical activities, including sports. Select a physical activity/sport with which you are familiar, explain each of these concepts, and then illustrate how the concept is used within that physical activity/sport.

potential short ans question

In a second class lever, _____.

the weight is between the fulcrum and the force

There are many different careers within the realm of physical education, exercise science, and sport. These include teaching physical education, exercise leadership, and sport management. Select one career and address the following question: Does a professional within that career need knowledge of biomechanics? Why or why not?

think

Both quantitative and qualitative analyses can be used to help individuals move more successfully and improve their performance. Compare and contrast the two approaches to analysis, being sure to describe the advantages and disadvantages of each.

think ab this one

In the human body, the lever systems formed by muscles pulling on bones are primarily which class of lever?

third

In boxing, the use of 16-ounce gloves rather than 12-ounce gloves reduces the chance of injury because the force is distributed over a greater area.

true

In using principles of leverage, if greater force is desired, the force arm should be lengthened to apply the force.

true

Isokinetic dynamometers are used to measure joint torque and power output in research and clinical settings.

true

Levers provide individuals with a mechanical advantage by producing either strength or speed.

true

Pressure refers to the ratio of force to the area over which the force is applied.

true

Reactive strength is often calculated from drop jumps and is used to asses an athlete's ability to produce force under high loads and rapid muscle stretch, which is important in sports such as the long jump.

true

Static equilibrium is when the center of gravity is in a stable position.

true

The concept of stability, or balance, is related to equilibrium.

true

The movements of the body are produced mostly through third-class levers.

true

The two types of energy used in biomechanics are kinetic energy and potential energy.

true

Work refers to the force that is applied to a body through a distance and in the direction of the force.

true

"Acceleration" is a term for time rate of change in which of the following quantities?

velocity

Given that work is defined as force applied to a body through a distance and in the direction of the force (simply force times distance), a basketball player who bench-presses 180 pounds through 2 feet is doing _____.

360

Which of the following expressions defines velocity?

Change in position over a given time

If velocity is constant, then what is true of acceleration?

It is equal to zero.

The statement "a rotating body will maintain a state of constant angular motion unless acted on by an external torque" refers to which of the following?

Newton's first law