Levers

Question 1

What is the definition of lever systems?

Answer 1

The coordination of our bones and muscles to create movement

Question 2

What is the definition of a fulcrum?

Answer 2

Axis of rotation

Question 3

What 2 forces are applied at the 2 points in a lever?

Answer 3

Load and effort

Question 4

What are the 4 parts of a lever system?

Answer 4

Lever
Fulcrum
Effort
Load/resistance

Question 5

What are levers in the body?

Answer 5

Bones

Question 6

What are fulcrums in the body?

Answer 6

The joint

Question 7

What causes the effort force in the body?

Answer 7

The agonist muscle

Question 8

What is the load/resistance in the body?

Answer 8

The body part or resistance to be moved

Question 9

What are the 2 main functions of levers?

Answer 9

Generates muscular effort and overcome a load

Increase the speed of a given movement

Question 10

What is the lever in the upwards phase of the biceps curl?

Answer 10

Radius and ulna

Question 11

What is the fulcrum in the upwards phase of the biceps curl?

Answer 11

Elbow joint

Question 12

What is the effort in the upwards phase of the biceps curl?

Answer 12

Biceps brachii (internal force - agonist)

Question 13

What is the load in the upwards phase of the biceps curl?

Answer 13

Weight of forearm and free weight held

Question 14

What is in the middle in a first class lever?

Answer 14

Fulcrum

Question 15

What is in the middle in a second class lever?

Answer 15

Load

Question 16

What is in the middle in a third class lever?

Answer 16

Effort

Question 17

Definition of a load arm?

Answer 17

Distance from the fulcrum to the load

Question 18

Definition of an effort arm?

Answer 18

Distance from the fulcrum to the effort

Question 19

What type of lever system is extension of the elbow in an overarm throw?

Answer 19

First class
Elbow joint in between load of ball/forearm and the effort of triceps brachii

Question 20

What type of lever system is the ball of the foot when pointing toes?

Answer 20

Second

Load of leg/body is in between fulcrum of metatarsals/phalanges joint and the effort of gastrocnemius/soleus

Question 21

How do you work out mechanical advantage using resistance force and effort force

Answer 21

RF/EF

Question 22

How do you work out mechanical advantage using resistance arm and effort arm

Answer 22

EA/RA

Question 23

How do you work out mechanical advantage using resistance distance and effort distance

Answer 23

ED/RD

Question 24

What do the best levers have in terms of effort arm and load arm?

Answer 24

Long effort arm

Short load arm

Question 25

What do the best levers have in terms of effort distance and load distance?

Answer 25

Long effort distance

Short load distance

Question 26

Why are 2nd class levers always an advantage?

Answer 26

Effort arm always shorter than load arm so small effort can move large load

Question 27

What is the disadvantage of second class levers?

Answer 27

Only over a small distance and at the expense of velocity.

Question 28

Why is a third class lever never an advantage?

Answer 28

Load arm longer than effort arm

Large effort needed to move a small load

Question 29

What is an advantage of third class levers?

Answer 29

Although can’t be an advantage, does allow greater range of motion and generates more momentum and move load at a higher velocity.