Chapter 4-Biomechanics

Question 0

How many Newtons are in 1 pound of force?

Answer 0

4.45

Question 1

Definition of force

Answer 1

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

Question 2

Newton’s Laws of Motion

Answer 2

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

Question 3

Torque

Answer 3

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

Question 4

First Class lever

Answer 4

Fulcrum is located between 2 forces

Question 5

Second class lever

Answer 5

Resistance force is located between the fulcrum and the applied force

Question 6

Third class lever

Answer 6

Applied force lies between the fulcrum and the resistance force

Question 7

Mechanical advantage

Answer 7

Ratio of the resistance force to the applied force

Question 8

Standard unit of power

Answer 8

Watt

Question 9

Define mechanical work

Answer 9

Product of force times distance through which object moves

Question 10

Define mechanical power

Answer 10

Amount of work divided by time needed to do the work

Question 11

Define mechanical energy

Answer 11

Capacity to perform mechanical work

Question 12

Define length-tension relation

Answer 12

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

Question 13

Intramuscular changes that can increase force production

Answer 13

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

Question 14

Inter muscular changes that can increase force production

Answer 14

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

…or both