biomechanics

Question 1

force

Answer 1

push or pull

move the object/ change its shape

Question 2

types of forces

Answer 2

gravity
air/water resistance
friction

Question 3

gravity

Answer 3

force of attraction between 2 bodies or objects

force that causes objects to fall downwards towards centre of earth

Question 4

water and air resistance

Answer 4

opposes the direction of motion of the object, slowing it down

Question 5

friction

Answer 5

occurs when 2 surfaces come in contact with eachother

Question 6

inertia

Answer 6

a body to resist a change in its state of motion

Question 7

moment of inertia

Answer 7

spinning while skating with arms down= decreased inertia(speed up)
spinning while skating with arms out wide= increased inertia(slow down)

Question 8

impulse

Answer 8

equal to the change in momentum of an object

force x time

Question 9

impulse: increase force

Answer 9

shot-put: rotation and swing allows greater force

Question 10

impulse: decrease force

Answer 10

cricket: catching ball with gloves slows down the force

Question 11

types of motion

Answer 11

projectile
linear
angular
curvilinear
rectilinear
general

Question 12

angular motion

Answer 12

rotation around central axis or fixed point
when the body is lined up linear
walking/cycling- general motion
angular acceleration, distance/displacement, speed, velocity

Question 13

linear motion

Answer 13

movement where all body parts move in the same direction at the same speed
cyclist going downhill without peddling
acceleration, distance/displacement, speed, velocity

Question 14

projectile motion

Answer 14

movement of object through the air

factors that influence the flight path

Question 15

conservation of angular momentum

Answer 15

conserved when body is in flight
inertia decrease
angular velocity increased
gymnastics/diving

Question 16

angular velocity

Answer 16

measure of how quickly the object has moved from its starting point and in what direction it has moved
long jump

Question 17

angular momentum

Answer 17

quantity of angular motion of object

Question 18

height of release

Answer 18

difference between release height and landing height

Question 19

angle of release

Answer 19

angle at which object is projected into the air

Question 20

stability

Answer 20

ability of the body to resist a change in its current state of equilibrium

Question 21

equilibrium

Answer 21

when all forces and torques are balanced

Question 22

stability factors

Answer 22

base of support
centre of gravity
body mass
friction between body and surface

Question 23

first class lever

Answer 23

the resistance and force are on either side of the axis

seesaw- force and resistance opposite each other, axis in middle

Question 24

second class lever

Answer 24

the resistance is between the force and the axis

a person standing on tip-toes

Question 25

third class lever

Answer 25

the force is between the resistance and the axis

Question 26

advantage of levers

Answer 26

mechanical advantage= force arm/resistance >1= less effort to move a resistance <1= increased angular speed and range of motion

Question 27

summation of momentum: principals

Answer 27

large group muscles to small group muscles

Question 28

summation of momentum

Answer 28

the sequential and coordinated movement of each body segment to produce maximum velocity

Question 29

projectile motion factors

Answer 29

vertical- height reached and affected by gravity horizontal- distance covered and affected by air resistance angle, height and speed of release

Question 30

rectilinear motion

Answer 30

skiing

Question 31

curvilinear motion

Answer 31

basketball shot

Question 32

torque

Answer 32

cause rotation about an axis/angular acceleration | greater the torque, greater the angular acceleration

Question 33

general motion

Answer 33

all movements of human body

Question 34

newton law no. 1

Answer 34

body will remain at rest unless acted upon by external force

Question 35

newton law no. 2

Answer 35

force applied to object will produce change in motion in direction of applied force that's directly the size of force

Question 36

newton law no. 3

Answer 36

every action there is an equal and opposite reaction

Question 37

weight

Answer 37

mass x gravity

Question 38

momentum

Answer 38

mass x velocity