Biomechanics

Question 1

angular motion

Answer 1

-refers to rotation and involves movement around an axis
-occurs when a force is applied outside Centre of mass
-can involve the whole body or part of the body
-occurs due to torque(turning force) which causes an object to turn around its axis of rotation

Question 2

newtons first law(angular motion)

Answer 2

-a rotating body will continue turning around its axis of rotation until an external rotational force is applied upon it

Question 3

newtons second law(angular motion)

Answer 3

-the rate of change of angular momentum of a body is proportional to the force causing it and the change that takes place in the direction in which the force acts

Question 4

newtons third law(action/reaction)

Answer 4

-when a force is applied by one body to another, the other body will exert an equal and opposite force on the other body

Question 5

the law of inertia (newtons first law)

Answer 5

-the law of inertia states that a performer will remain stationary unless a strong enough force is applied to overcome inertia

Question 6

newtons second law(law of acceleration)

Answer 6

-law of acceleration states that the rate of change of momentum of an object is directly proportional to the force causing the change

F=MA(force=mass x acceleration)

Question 7

newtons third law(law of action/reaction)

Answer 7

-states that for every action there is an equal and opposite reaction

Question 8

speed=

Answer 8

distance/time

Question 9

distance=

Answer 9

speed x time

Question 10

Centre of mass

Answer 10

-Centre of mass refers to the point of balance of a body
-it moves due to the body moving

Question 11

factors affecting stability

Answer 11

height of centre of mass- the lower the centre of mass the greater the stability

area of support base- the larger the base of support the greater the stability

position of line of gravity- increased stability when it is central over the base of support

body mass- the greater the mass the greater the stability due to increased inertia

Question 12

angular displacement

Answer 12

-angular displacement refers to the smallest change in angle between the starting and finish point

Question 13

angular velocity

Answer 13

-angular velocity refers to the rotational speed of an object and the axis in which the object is rotating

Question 14

vector quantity

Answer 14

-vector quantity refers to the angular displacement that is covered in a certain time

Question 15

angular acceleration

Answer 15

-angular acceleration refers to the rate of change of angular velocity

Question 16

inertia

Answer 16

-inertia refers to the resistance to change in motion

Question 17

moment of inertia

Answer 17

-moment of inertia refers to the resistance of a body to angular motion(rotation)
-dependent on the mass of the body

Question 18

how does the mass of the object impact the moment of inertia

Answer 18

-the greater the mass, the greater the resistance to change so therefore the greater the moment of inertia

Question 19

how does the distribution of mass from the axis of rotation impact the moment of inertia

Answer 19

-the closer the mass is to the axis of rotation, the easier it is to turn because the moment of inertia is low

Question 20

scalar quantity

Answer 20

When measurements are only described in terms of size or magnitude – mass, distance and speed​

Question 21

vector quantity

Answer 21

When measurements are described in terms of magnitude (size) and direction – weight, acceleration, displacement, velocity and momentum​

Question 22

Mass​ vs weight

Answer 22

mass:
-matter refers to the amount of matter or substance in our body​
-Made up of bone, muscle, fat, tissue and fluid​
-Measured in kg​
weight:
-Force on a given mass due to gravity​
-Measured in N​
-Is a vector​

Question 23

acceleration

Answer 23

=change in velocity/time
-when velocity increases, positive acceleration occurs and when velocity is decreasing, negative acceleration takes place
-vector quantity

Question 24

distance vs displacement

Answer 24

Distance:​
-the length of the path the body takes as it moves from a starting position to a finish position​
-Measured in metres​
-Is a scalar quantity (only measures size)​

​Displacement:
-Shortest route in a straight line between the start and finish position​
-Measured in metres​
-Vector quantity (direction & size)​

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