LEAVERS

Question 1

What are the 4 components of leavers?

Answer 1

Lever - Bone

Fulcrum- Joint

Effort (E)- Muscular Force

Load (L)- Weight Resistance

Question 2

What are the two purposes of leavers?

Answer 2

Generating effort to overcome a load

Increasing the speed of a movement

Question 3

First class levers have the ?
in the centre

Answer 3

fulcrum

Question 4

Second class levers have the ?
in the centre

Answer 4

load

Question 5

Third class levers have the ?
in the centre

Answer 5

effort

Question 6

Longer leavers generate larger or smaller force?

Answer 6

Larger

Question 7

As the “arm” becomes longer what becomes increasingly significant?

Answer 7

The load or effort

Question 8

The distance from fulcrum to effort is known as?

Answer 8

Effort arm

Question 9

The distance from fulcrum to load is known as?

Answer 9

Load arm

Question 10

By the nature of its arrangement, a second class lever
always has a longer ? arm compared to its ?
arm

Answer 10

Effort

Load

Question 11

Third class lever always has a longer ? arm compared too its ? arm

Answer 11

Load

Effort

Question 12

Second class levers can move ? loads with ? effort

Answer 12

Large

Little

Question 13

What is a mechanical advantage?

Answer 13

The load is only moved through a short range of
motion so acceleration is reduced.

We see this at the ankle where a relative small
muscle (gastrocnemius) is able to lift our whole
body weight.

Question 14

Third class levers require large ?
to move relatively ? loads.

Sporting example?

Answer 14

Efforts

Small

However, the load is moved through a
large range of motion creating greater
velocity and increasing acceleration.

We see this in football when a player
strikes a ball - the additional length of
the load arm creates high velocity at the
foot, giving the strike significant power.

Question 15

Mechanical advantage =

Answer 15

load/effort