Sac 2 Flashcards Preview

Year 12 P.E revision > Sac 2 > Flashcards

Flashcards in Sac 2 Deck (33):
1

force

push or pull
move the object/ change its shape

2

types of forces

gravity
air resistance
friction

3

gravity

force of attraction between 2 bodies or objects
force that causes objects to fall downwards towards centre of earth

4

water and air resistance

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

5

friction

occurs when 2 surfaces come in contact with eachother

6

inertia

a body to resist a change in its state of motion

7

moment of inertia

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

8

impulse

equal to the change in momentum of an object

9

impulse: increase force

shot-put: rotation and swing allows greater force

10

impulse: decrease force

cricket: catching ball with gloves slows down the force

11

types of motion

projectile
linear
angular
curvilinear
rectilinear
general

12

angular motion

rotation around central axis or fixed point
when the body is lined up linear
walking/cycling- general motion

13

linear motion

movement where all body parts move in the same direction at the same speed
cyclist going downhill without peddling

14

projectile motion

movement of object through the air
factors that influence the flight path

15

conservation of angular momentum

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

16

angular velocity

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

17

angular momentum

quantity of angular motion of object

18

height of release

difference between release height and landing height

19

angle of release

angle at which object is projected into the air

20

stability

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

21

equilibrium

when all forces and torques are balanced

22

stability factors

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

23

first class lever

the resistance and force are on either side of the axis
seesaw- force and resistance opposite each other, axis in middle

24

second class lever

the resistance is between the force and the axis
a person standing on tip-toes

25

third class lever

the force is between the resistance and the axis

26

advantage of levers

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

27

summation of momentum: principals

large group muscles to small group muscles

28

summation of momentum

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

29

projectile motion factors

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

30

rectilinear motion

skiing

31

curvilinear motion

basketball shot

32

torque

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

33

general motion

all movements of human body