2.1 Lever systems Flashcards Preview

SHHS - GCSE PE Unit 1 > 2.1 Lever systems > Flashcards

Flashcards in 2.1 Lever systems Deck (22)
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1

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FLE

2

What are the four parts to a lever?

1. Effort
2. Fulcrum
3. Load
4. Lever arm

3

What is the fulcrum?

The pivot point of the lever e.g. the joint

4

What is the effort?

The force applied to use the lever e..g the muscle contracting

5

What is the load?

The force applied by the lever e.f what is being moved

6

How many classes of lever are there?

3

7

What is in the middle of a first class lever?

The fulcrum

8

What is in the middle of a second class lever?

The load

9

What is in the middle of a third class lever?

The effort

10

Name the 2 first class levers in the body?

The neck - tilting backwards
Elbow extension

11

Name the 1 second class lever in the body?

Plantar flexion

12

Name the third class levers in the body?

All movements apart from
- neck
- elbow extension
- plantar flexion

13

What are the advantages of a first class lever?

Large load can be lifted with a small amount of effort

14

What are disadvantages of a first class lever?

Limited flexibility
Slow movements - not good for generating power

15

What are the advantages of a second class lever?

Large load can be lifted with a small amount of effort

16

What are the disadvantages of a second class lever?

Limited flexibility
Slow movements - not good for generating power

17

What are the advantages of a third class lever?

Fast movement
Large range of movement

18

What are the disadvantages of a third class lever?

A large amount of effort is required

19

What is meant by the term 'mechanical advantage'?

The effort required is less than the load

20

What is meant by the term 'mechanical disadvantage'?

The effort required is greater than the load

21

Which class of lever work with a mechanical advantage?

First and second class

22

Which class of lever work with a mechanical disadvantage?

Third class