Lesson 2: Biomechanics

Question 1

Forces are classified as either _______ or ________.

Answer 1

Internal, External

Question 2

______ forces act within the object or system.

Answer 2

Internal

Question 3

______ forces act on an object through some interaction

Answer 3

External

Question 4

A muscle whose torque prevents movement at a joint.

Answer 4

Stabilizer

Question 5

The muscle that causes action.

Answer 5

Prime mover

Question 6

A single-sided or unbalanced load or weight distribution.

Answer 6

Asymetrical Load

Question 7

A stable state characterized by the cancellation of all forces by equal opposing forces.

Answer 7

Balance

Question 8

Sum of all external forces acting on the body equal zero: determines the ability the balance.

Answer 8

Static equilibrium

Question 9

Capacity to do work.

Answer 9

Energy

Question 10

Transfer or energy by a force acting to displace the body.

Answer 10

Work

Question 11

Work can either be ______ or _______.

Answer 11

Positive or Negative

Question 12

If weight is pressed overhead, the action is ______ work: when the weight is lowered back down, the action is considered______.

Answer 12

Positive , Negative

Question 13

Mechanical energy has 2 forms:
_______ energy - Energy possessed by the body due to its motion.
_______ energy - Suggests no movement; implies energy due to position, such as a stretched rubber band or muscle.

Answer 13

Kinetic

Potential

Question 14

The _____ - _____ _______ uses kinetic energy transferred into potential energy and back into kinetic energy for increased force output.

Answer 14

Stretch - Shortening Cycle (SSC)

Question 15

Time of rate of doing work (work/time)

Answer 15

Power

Question 16

The turning affect created by a force about an axis

Answer 16

Torque

Question 17

The distance between the fulcrum and the resistance point.

Answer 17

Resistance arm

Question 18

The more torque experienced during exercise, the greater the ______ of the movement, even when the weight remains _______.

Answer 18

Difficulty, Constant.

Question 19

Point where the mass of an object is equally balanced.

Answer 19

Center of Gravity (COG)

Question 20

A group of body Segments that are connected by joints and operate together to provide a wide range of motion for a limb.

Answer 20

Kinetic chain

Question 21

Stability is achieved with the following variables :
\_\_\_\_\_\_ of the object.
\_\_\_\_\_\_ of the COG.
Line of \_\_\_\_\_\_\_ pull.
\_\_\_\_\_\_ of Support.

Answer 21

Mass
Height
Gravitational
Base

Question 22

________ momentum is commonly employed during exercise when excessive resistance is used. Most often generated from _____ extensions or flexion to increase total force output.

Answer 22

Angular, Hip

Question 23

Role of muscle who torque opposes a performed action.

Answer 23

Antangonist

Question 24

Role of muscle whose torque aids a performed action; referred to as the prime mover.

Answer 24

Agonist

Question 25

_______ balance - the force production relationship between an agonist and antagonist muscle or group of muscles acting on a joint.

Answer 25

Strength

Question 26

Power output is dependant on which two factors?

Answer 26

• Quantity of power

- Time it is sustained