Soc 20-levers

Question 1

What is a lever?

Answer 1

-‘lever’ refers to a system of muscles and bones working together to bring about movement
-when you exercise your muscles pull your bones, and your bones create movement,acting as levers

Question 2

How does a lever work?

Answer 2

Fulcrum(or pivot)-the point around which the lever rotates(joints)
Load-the force that is applied by the lever system (resistance/object)
Effort-a force that is applied by the user of the lever system (muscles)
Lever arm- a rigid bar such as bone

Question 3

What do each images represent

Answer 3

Fulcrum-triangle
Load-square
Effort-arrow
Lever arm- rectangle

Question 4

Acronym

Answer 4

F-fulcrum
L-load
E-effort

Question 5

First class lever-what is it?

Answer 5

Fulcrum is in the middle

Question 6

Example 1-tricep dip

Answer 6

The elbow is the fulcrum which sits between the load (bodyweight) and the effort applied by the tricep

Question 7

Example 2-nodding your head

Answer 7

The neck joint (atlas and axis) is the fulcrum which sits between the load (head) and the effort applied by the neck muscle

Question 8

Second class lever-what is it?

Answer 8

The load sits in the middle between the fulcrum and effort

Question 9

Example 1-calf raiser

Answer 9

The body weight (load) sits between the toes and balls of feet (fulcrum) and the gastrocnemius muscles apply the effort by pulling the heel

Question 10

Example 2-lifting a wheelbarrow

Answer 10

The weight on the wheelbarrow when your carrying the load which sits between the wheel (fulcrum) and the handle (effort)

Question 11

Third class levers-what is it?

Answer 11

The effort sits between the middle,between fulcrum and load

Question 12

Example 1-bicep curl

Answer 12

The effort is applied by the bicep, which is between the fulcrum at the elbow jount and weight in your hands(load)

Question 13

Example2-using a spade

Answer 13

The effort is applied by foot (gastrocnemius) which is between the fulcrum at the handle and weight on the soil (load)

Question 14

Defenition of mechanical advanatges

Answer 14

A large load can be lifted with a relatively small amount of effect

This happens when the output lever is greater than input-the load is greater than effort, so you are getting more out than your putting in

Question 15

Which levers are mechanical advanatges

Answer 15

First and second class levers

Question 16

Mechanical disadvanatges defenition

Answer 16

Definition: Third class levers cannot lift as heavy a load
with the same amount of effort, due to the position of
the effort and load from the fulcrum.
This happens when the effort and the load are both the
same side of the fulcrum but the effort sits closer to the
fulcrum than the load does.
The input of the lever is greater than the output - the
force you apply is greater than the load so you are
putting in more than you are getting out.

Question 17

Which levers are mechanical disadavntages

Answer 17

Third class levers