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GCSE PE✅ > Soc 20: Levers System > Flashcards

Soc 20: Levers System Flashcards

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1
Q

What is the falcrum?

A

The point around which a lever rotates

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2
Q

What is the load?

A

The force applied to the lever system

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3
Q

How do we know what class of lever a lever is?

A

FLE

First class:Falcrum is in the middle 
Second class: load is in the middle
Third class lever: effort is in the middle
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4
Q

What is the lever arm?

A

A rigid bar such as a bone

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5
Q

What is the effort?

A

A force that is applied by the user of the lever system

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6
Q

Decribe the first class lever?

A

Effort on the left(down)
Falcrum in the middle (down)
Load on the right(down)

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7
Q

What is a lever?

A

It refers to the system of muscles and bones(joints) working together to bring about movement

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8
Q

Bones act as______

A

Lever arms

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9
Q

Joints act as _____

A

Fulcrum

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10
Q

Muscles act as the ____ and

A

Load

Effort

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11
Q

What type of lever is the elbow joint?

A

Third class lever

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12
Q

What type of lever is the heel joint?

A

Second class lever

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13
Q

What type of lever is the joint between the skull and the first vertebrae?

A

Firt class lever

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14
Q

Describe the features of a second class lever? (Heel joint)

A

The effort is on the left, the gascrocnemius contracts so the direction of travel is UPWARDS

The load is in the MIDDLE the body weight makes the direction of load DOWN

The falcrum is on the right

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15
Q

Sporting example of second class lever?

A

Just before a diver jumps of the diving board

-calf raise

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16
Q

What are the advantages and disadvantages of first class levers?

A

Advantages:

  • stable
  • strong
  • increasing length of lever arm

Disadvantages:

  • slow
  • limited flexibility
17
Q

What are the advantages and disadvantages of second class levers?

A

Advantages:

  • strong
  • stable
  • increasing the length of lever arm
  • increases the mechanical advantage
18
Q

What are the advantages and disadvantages of third class levers?

A

Advantages:

  • fast movement
  • long range of motion
  • increasing the length of lever arm
  • decreasing the mechanical arm

Disadvantages: -the force must always exceed the load

19
Q

What is a mechanical advantage

A

Allows a load to be moved with small muscular effort

20
Q

Describe second class lever system?

A

Falcrum left
Load midddle
Effort right

21
Q

Describe a third class lever system?

A

Falcrum-left
Effort-midde
Load-right

GCSE PE✅ (28 decks)

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