Flashcards in Biomachanics Outcome 1b Deck (34):

1

## Stability

### Resistance to the disruption of equilibrium

2

## Factors affecting stability

###
-Base of support

-friction

-line of gravity

-centre of gravity

-body mass

3

## Base of support

###
-Area of body that is in contact with the supporting surface

-increase base of support = increase stability

4

## Line of gravity

###
Directing which gravity acts on the body

Closer to centre of base of support the line of gravity is the greater that stability

5

## Centre of gravity

###
Point where weight is balanced regardless of the position of the body

Lower the centre of gravity the higher the stability

6

## Friction

### The higher the friction between the body and the supporting surface the greater the stability

7

## Body mass

### Greater body mass= greater stability

8

## Impulse

### The change in momentum in an object

9

## How to increase force with impulse

###
-Increase amount of time force is active on object

-high force for short contact period

10

## How to decrease force with impulse

###
Increase amount of time on contact with object

11

## Summation of motion

###
-use more body parts to perform action

-use stronger muscle groups then smaller/faster muscle groups

-coordinate the sequence of body parts

-create stable base of support for movement to occur around

12

## Moment of inertia

###
A body’s tendency to resist change in angular motion

-high moment of inertia = low angular velocity

-low moment of inertia = high angular velocity

13

## Angular velocity

### -measurement of how quickly the object has moved from its starting point to finish point and in what direction

14

## Angular momentum

###
-The amount of motion possessed by a body

-product of moment of inertia and angular velocity

15

## Height of release

### -Difference between height of release and land height

16

## Angle of release

###
-furtherest distance = 45degrees

-furthers height= 180 degrees

- landing position higher than launch position = release over 45 degrees

- landing position lower than launch position = release under 45 degrees

17

## Gravity

###
-force that brings projectiles towards the earth

-results is parabolic flight path

18

## Air resistance

### -opposes the direction of the motion of the object, slowing it down.

19

## How to decrease air resistance

### -decrease surface area through body position

20

## Factors affecting friction of an object in motion

### -increase amount of in perfections on the contacting surface

21

## Types of motion

###
General motion

Linear motion

Angular motion

Projectile motion

22

## Newton’s first law

### A body will remain at rest unless acted upon by an external force

23

## Newton’s second law

### Force applied to an object will change motion directly proportional to the size of the force applied

24

## Newton’s third law

### For every action there is an equal and opposite reaction

25

## Torque

### A rotational force that makes an object rotate

26

## Moment of inertia

###
-A body’s resistance to change in angular motion

- longer the object the higher the moment of inertia

-moi high = low angular velocity

-low moi= high angular velocity

27

## First class lever

###
Resistance - axis - force

28

## Benefit of first class lever

###
-longer force arm = less force required to move resistance

- longer resistance arm = increased speed and range of motion

29

## Second class lever

###
Axis-resistance-force

30

## Benefit of second class lever

###
-Always requires less force to move resistance

-(MA >1)

- wheelbarrow , push-up

31

## Third class lever

### Axis-force-resistance

32

## Benefit of third class lever

###
-increased range of motion and speed

33

## Distance

### Measures the path traveled from start to finish

34