Levers

Question 1

Functions of a Muscle Contraction

Answer 1

• Act as a MOTIVE force to move a body part
• Act as a RESISTIVE force to resist the movement of a body part
• Act to STABILIZE a body part

Question 2

Isometric Contraction

Answer 2

A contraction during which the muscle length stays constant

Question 3

Isotonic Contraction

Answer 3

Contraction that produces tension and the muscle length changes

Question 4

Eccentric Contraction

Answer 4

Contraction where the muscle length lengthens

Question 5

Concentric Contraction

Answer 5

Contraction where the muscle length shortens

Question 6

Isokinetic

Answer 6

Contraction in which the speed of movement remains constant

Question 7

Components of a Lever System

Answer 7

• Axis of rotation
• Resistive Force
• Motive Force

Question 8

First Class Lever

Answer 8

• The fulcrum is between the motive and resistive forces

- Examples: see-saw, pliers, crowbar

Question 9

Second Class Lever

Answer 9

• The resistive force is between the fulcrum and the motive force
• Examples: wheelbarrow, opening/closing a door

Question 10

Third Class Lever

Answer 10

• The motive force is between the fulcrum and the resistive force
• Examples: swinging a bat, shoveling (where the front hand lifts and back hand is axis)