Chapter 4-Biomechanics Flashcards Preview

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Flashcards in Chapter 4-Biomechanics Deck (15)
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Definition of force

A mechanical action or effect applied to a body that tends to produce acceleration.

1

How many Newtons are in 1 pound of force?

4.45

2

Newton's Laws of Motion

1. At rest stays at rest
2. Force acting on a body produces acceleration following F=m x acceleration
3. Equal and opposite reaction

3

Torque

Effect of force that causes a twisting or rotation about an axis.

4

First Class lever

Fulcrum is located between 2 forces

5

Second class lever

Resistance force is located between the fulcrum and the applied force

6

Third class lever

Applied force lies between the fulcrum and the resistance force

7

Mechanical advantage

Ratio of the resistance force to the applied force

8

Standard unit of power

Watt

9

Define mechanical work

Product of force times distance through which object moves

10

Define mechanical power

Amount of work divided by time needed to do the work

11

Define mechanical energy

Capacity to perform mechanical work

12

Define length-tension relation

Force produced by musculotendinous unit is determine, in part, by its length

13

Intramuscular changes that can increase force production

1. Increase firing frequency of of the motor unit
2. Increase number of motor units recruited
3. Recruit progressively larger motor units

14

Inter muscular changes that can increase force production

1. Increase activation of agonists and synergists
2. Decrease activation of antagonists

...or both