chapter 2 - levers etc

Question 1

lever

Answer 1

rigid bar that turns about an axis to create movement

Question 2

fulcrum

Answer 2

fixed point at which a lever turns

also named axis

Question 3

load

Answer 3

the weight the lever must move

Question 4

effort

Answer 4

force required to move the load

Question 5

way to remember 1st class lever

Answer 5

LiFE

lever, fulcrum, effort

Question 6

way to remember 2nd class lever

Answer 6

FiLE

fulcrum, lever, effort

Question 7

way to remember 3rd class lever

Answer 7

FELl

fulcrum, effort, load

Question 8

1st class: definition

linear, practical, & sporting examples

Answer 8

1st class: fulcrum usually quite close to the effort and load

effort, fulcrum, load

scissors

javelin

Question 9

2nd class: definition

linear, practical, and sporting examples

Answer 9

2nd class: large load can be moved with low effort

fulcrum, load, effort

nutcracker

press up

Question 10

3rd class: definition

linear, practical, and sporting examples

Answer 10

3rd: produce a larger range of movement with low effort

fulcrum, effort, load

tweezers

sports that use bats/ rackets: tennis

Question 11

load arm:

Answer 11

distance from the load to the fulcrum

Question 12

effort arm-

Answer 12

distance from the effort arm to the fulcrum

Question 13

mechanical advantage-

Answer 13

measures the efficiency of a lever

effort arm/ load arm

Question 14

effort arm longer than load arm….?

Answer 14

HIGH mechanical adv

Question 15

load arm longer than effort arm….?

Answer 15

LOW mechanical adv

Question 16

mechanical adv in 1st class levers….

Answer 16

either HIGH or LOW

load arm longer- low
effort arm longer- high

Question 17

mechanical adv in 2nd class levers…..

Answer 17

always HIGH

big effort arm with small load arm

Question 18

mechanical adv in 3rd class levers…..

Answer 18

always LOW

small effort arm
big load arm

Question 19

planes of movement-

Answer 19

an imaginary line that splits the body in two and decides the movement.

WHERE THE MOVEMENT OCCURS

Question 20

axes of movement-

Answer 20

an imaginary straight line through the body around which it rotates

WHERE THE ROTATION OCCURS

Question 21

1) sagittal-
2) transverse-
example:

(SOME
TIMES)

Answer 21

1) back to front
2) spit roast

running, front roll

Question 22

1) frontal
2) sagittal

examples

(FUN STARTS)

Answer 22

1) through the middle
2) diagonally through

cartwheel, star jump

Question 23

1) transverse
2) longitudinal

examples

(TOO LATE)

Answer 23

1) through belly button
2) head to toe

golf swing, throwing