Levers

Question 1

What is a lever

Answer 1

a solid bar that turns around an axis to create movement

Question 2

what are the three different components of a lever

Answer 2

-fulcrum
-resistance
-effort

Question 3

describe fulcrum

Answer 3

-fixed point which a lever can turn at
-can be a joint or a point of contact with the floor or an external object

Question 4

describe resistance

Answer 4

-the load or weight that a lever must work against

Question 5

describe effort

Answer 5

-the force required to move the resistance
-applied by the muscles as they contract

Question 6

what does FRE represent

Answer 6

F- center of 1st class lever
R- center of 2nd class lever
E- center of 3rd class lever

Question 7

describe a first class lever

Answer 7

-ex. nodding your head

-trapezius muscle provides the effort
-the weight of head provides resistance
-the joint between the spine and cranium is the fulcrum

Question 8

describe a 2nd class lever

Answer 8

Ex. plantar flexion

-fulcrum is the joints between the toes
-resistance is the body weight
-effort is provided by the gastrocnemius

Question 9

describe a 3rd class lever

Answer 9

ex. bicep curl

-fulcrum is elbow joint
-effort is provided by bicep muscle
-resistance is the weigh or the dumbbell