Lesson 2: Biomechanics Flashcards Preview

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Flashcards in Lesson 2: Biomechanics Deck (26)
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1

Forces are classified as either _______ or ________.

Internal, External

2

______ forces act within the object or system.

Internal

3

______ forces act on an object through some interaction

External

4

A muscle whose torque prevents movement at a joint.

Stabilizer

5

The muscle that causes action.

Prime mover

6

A single-sided or unbalanced load or weight distribution.

Asymetrical Load

7

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

Balance

8

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

Static equilibrium

9

Capacity to do work.

Energy

10

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

Work

11

Work can either be ______ or _______.

Positive or Negative

12

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

Positive , Negative

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.

Kinetic
Potential

14

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

Stretch - Shortening Cycle (SSC)

15

Time of rate of doing work (work/time)

Power

16

The turning affect created by a force about an axis

Torque

17

The distance between the fulcrum and the resistance point.

Resistance arm

18

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

Difficulty, Constant.

19

Point where the mass of an object is equally balanced.

Center of Gravity (COG)

20

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

Kinetic chain

21

Stability is achieved with the following variables :
______ of the object.
______ of the COG.
Line of _______ pull.
______ of Support.

Mass
Height
Gravitational
Base

22

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

Angular, Hip

23

Role of muscle who torque opposes a performed action.

Antangonist

24

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

Agonist

25

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

Strength

26

Power output is dependant on which two factors?

- Quantity of power
- Time it is sustained