Lecture 6

Question 1

Biomechanics

Answer 1

Application of mechanical laws to living structures, specifically to the locomotor system of the human body

Question 2

Qualitative movement analysis

Answer 2

Non-numerical description of a movement based on direct observation (coaching watching you at tryout)

Question 3

Quantitative movement analysis

Answer 3

A movement is analyzed numerically based on measurement from data (stats)

Question 4

Mass

Answer 4

The quantity of matter contained in an object

-Units = Kg

Question 5

Force

Answer 5

Mass x Acceleration
Units (Newtons) N
- 1N = (1Kg)(1m/s^2)

Question 6

Weight

Answer 6

The amount of gravitational force exerted on a. body
Weight = mass x acceleration of gravity
9.81m/s^2

Question 7

Volume

Answer 7

The amount of space that a body occupies

Question 8

Pressure

Answer 8

Force distributed over a given area
-Pressure = F/A
(units N/m^2) (N/cm^2)

Question 9

Compression

Answer 9

Pressing or squeezing force directly axially through a body

Question 10

Tension

Answer 10

Pulling or stretching force directly axially through a body

Question 11

Shear

Answer 11

Force directed parallel to a surface

Question 12

Mechanical stress

Answer 12

F/A Similar to pressure

Question 13

3 Point in a lever

Answer 13

Force Point (F) = where force is applied 
Resistance point (R) = where the resistance acts
Fulcrum (A) = the Axis of motion

Question 14

First class Lever (Arf)

Answer 14

Fulcrum is between force point and resistance point

Seesaw

Question 15

Second class lever (aRf)

Answer 15

Resistance point is between the force point and the fulcrum.
Wheel barrow

Question 16

3rd class Lever (arF)

Answer 16

Force point is between the resistance and the fulcrum

Question 17

Mechanical advantage

Answer 17

The efficiency with which a lever is able to magnify forces is described by its mechanical advantage
Force arm/Resistance arm

Question 18

Force lever

Answer 18

When FA is longer than RA,
Favors force
sacrifices speed

Question 19

Speed lever

Answer 19

RA is longer than FA
Favors speed and range of motion
Sacrifices force

Question 20

Moment arm

Answer 20

The perpendicular distance between the force’s line of action and the axis of rotation

Question 21

Torque

Answer 21

The product of force and the perpendicular distance (moment arm ) from the force’s line of action to the axis of rotation. IT may be thought of as rotary force.

= Force (N) x Moment arm (m)

Question 22

Centre of gravity

Answer 22

The point of intersection of 3 cardinal planes of the body
The point of exact centre around which the body may rotate freely in all directions
The point around which the weight is equal on all opposite side

Question 23

Newton’s first Law of motion

Law of inertia

Answer 23

Amount of inertia a body possess is directly proportional to its mass. An object at rest will remain at rest

Question 24

Second law - Law of Acceleration

Answer 24

Force = mass x acceleration

More force more acceleration

Question 25

3rd Law - Law of reaction

Answer 25

When a body exerts a force onto something, the second body exerts the same force

Question 26

Momentum

Answer 26

Quantity of motion that an object possess

Mass x Velocity

Question 27

Work

Answer 27

Force x distance

Units of work - 1.0 J

Question 28

Power

Answer 28

Work per unit of time
(Force x distance) / t
Unit of power = watt = j/sec