biomechanics

Question 1

moment is also known as

Answer 1

torque

Question 2

define moment/torque

Answer 2

rotational effect of a force about a point
Moment = force x distance

Question 3

define lever

Answer 3

machine that operates on moments

Question 4

how does a lever work

Answer 4

rigid bar (bone) that acts on an axis (joint) and has an applied force (muscles) acting on a resistance force (bodyweight and other external forces)

Question 5

types of levers

Answer 5

first class: axis is in the middle
ex: C1 joint is in the middle bw front of skull (weighed down by gravity) and back of skull (force applied to keep head level)

second class: resistance is in the middle
ex: during heel off, gravity (resistance) is in between MTP joint ( axis ) and calf (force)

third class: force is in the middle
ex: muscle (force) is between joint and weight at other side (carrying dumbbell)

Question 6

most common lever in humans

Answer 6

third class