BIOMECHANICS 2

Question 1

FLUID MECHANICS

Answer 1

the study of objects or bodies that travel through a fluid

Question 2

PROJECTILE

Answer 2

human bodies or objects launched into the air that are subject to the forces or weight and air resistance only

Question 3

STREAMLINING

Answer 3

shaping a body so that it causes the least drag when travelling through a fluid

Question 4

AEROFOIL

Answer 4

a streamlined she with a curved upper surface and an under surface that is predominantly flat - like the cross-section of the wing of an aircraft

Question 5

PARABOLA

Answer 5

a uniform curve that is symmetrical about its highest point

Question 6

LIFT FORCE

Answer 6

force that acts perpendicular to the direction of travel for a body moving though a fluid

Question 7

ANGLE OF ATTACK

Answer 7

the angle at which a projectile is tilted from the horizontal. lift force will increase as the angle of attack is increased up to a certain point (usually around 17 degrees)

Question 8

BERNOULLI PRINCIPLE

Answer 8

stated that molecules in a fluid exert less pressure the faster they travel and more pressure the slower they travel

Question 9

PRONATE

Answer 9

to rotate the radio-ulnar joint so the palm faces downwards

Question 10

SUPINATE

Answer 10

to rotate the radio-ulnar joint so the palm faces upwards

Question 11

ECCENTRIC FORCE

Answer 11

force whose line of application passes outside the centre of mass of a body, causing the resulting motion to be angular

Question 12

MAGNUS EFFECT

Answer 12

explains the deviations in flight paths of spinning balls in sport

Question 13

ANGULAR MOTION

Answer 13

when a body or part of a body moves in a circle or part of a circle around a particular point called the axis of rotation

Question 14

EQUILIBRIUM

Answer 14

a body is in equilibrium when the net force = 0

Question 15

CENTRE OF MASS

Answer 15

the point at which the body is balanced in all directions

Question 16

STABILITY

Answer 16

the ability of a body to return to equilibrium or its original position after being displaced

Question 17

IMPULSE

Answer 17

the product of force multiplied by the time for which the force acts (Ns)

Question 18

FRICTION FORCE

Answer 18

the force that acts in opposition to the movement of one surface over another

Question 19

AIR RESISTNACE

Answer 19

the force acting in the opposite direction to the motion of a body travelling through air

Question 20

DRAG / FLUID FRICTION

Answer 20

the resistance caused by friction in the direction opposite to the motion of a body travelling through a fluid

Question 21

FREE BODY DIAGRAM

Answer 21

a clearlly labelled sketch showing all of the forces acting on a particular object at a particular instant in time

Question 22

NORMAL REACTION FORCE

Answer 22

the force between two bodies in contact with each other in a direction perpendicular to the surface of contact