Chapter 4-Biomechanics Flashcards Preview

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Flashcards in Chapter 4-Biomechanics Deck (15)
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0
Q

How many Newtons are in 1 pound of force?

A

4.45

1
Q

Definition of force

A

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

2
Q

Newton’s Laws of Motion

A
  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
Q

Torque

A

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

4
Q

First Class lever

A

Fulcrum is located between 2 forces

5
Q

Second class lever

A

Resistance force is located between the fulcrum and the applied force

6
Q

Third class lever

A

Applied force lies between the fulcrum and the resistance force

7
Q

Mechanical advantage

A

Ratio of the resistance force to the applied force

8
Q

Standard unit of power

A

Watt

9
Q

Define mechanical work

A

Product of force times distance through which object moves

10
Q

Define mechanical power

A

Amount of work divided by time needed to do the work

11
Q

Define mechanical energy

A

Capacity to perform mechanical work

12
Q

Define length-tension relation

A

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

13
Q

Intramuscular changes that can increase force production

A
  1. Increase firing frequency of of the motor unit
  2. Increase number of motor units recruited
  3. Recruit progressively larger motor units
14
Q

Inter muscular changes that can increase force production

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

…or both