Biomechanics - Calculations, Centre Of Mass And Stability Flashcards Preview

A-Level PE Anatomy And Physiology > Biomechanics - Calculations, Centre Of Mass And Stability > Flashcards

Flashcards in Biomechanics - Calculations, Centre Of Mass And Stability Deck (16)
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1

Define force

A push or pull that usually effects the state of motion of an object

2

Define momentum

The amount of motion possessed by a moving object

3

Define acceleration

The rate of change in velocity

4

Define weight

The gravitational force that the earth exerts on the mass of a body

5

How do you work out force?
What is the unit for force?

FORCE = mass x acceleration
Newtons (N)

6

How do you work out momentum?
What is the units for momentum?

Momentum = mass x velocity
Kilogram metres per second (Kgm/s)

7

What are the two formulas for acceleration?
What is the unit for acceleration?

1. Acceleration = force / mass
2. Acceleration = change in velocity / time
3. Meters per second (m/s)

8

What is the formula for weight?
What is weight measured in?

Weight = mass x gravitational field strength
Measured in kilograms (Kg)

9

Define centre of mass

The centre of mass is the point at which a body is balanced in all directions and from which weight appears to act

10

What are the two factors that effect the centre of mass

Shape
Density of different parts of the body

11

Where is the centre of mass of a regular shape and density

The centre of mass will be in the centre of the object

12

Where must the centre of mass be

The centre of mass must be where the mass is balanced around it in all directions

13

Define stability

Stability is a measure of how easily an object is moved from a position of equilibrium or balance

14

Define line of gravity

Line of gravity is an imaginary line extending vertically downward to the ground from the centre of mass

15

Define base of support

The base of support is the area enclosed by the points of contact with the ground

16

What 4 factors cause it difficult for a body to move out the base of support

1. Large base of support
2. Large mass
3. Low centre of mass (short line of gravity)
4. Line of gravity in the middle of the base of support

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