Topic on a page - lever systems

Question 1

what are lever systems

Answer 1

lever systems help you to move. they can increase the amount you can lift or the speed in which you can move something

Question 2

what is a lever and what is it shown as

Answer 2

a bone and is shown as a straight line

Question 3

what is a fulcrum and what is it shown as

Answer 3

a pivot or joint and is shown as a triangle

Question 4

what is effort and what is it shown as

Answer 4

a force provided by muscles and is shown by an arrow

Question 5

what is load and what is it shown as

Answer 5

the weight of the body/ object being moved, it is shown as a square

Question 6

what is in the middle of a first class lever

Answer 6

fulcrum

Question 7

what is in the middle of a second class lever

Answer 7

load

Question 8

what is in the middle of a third class lever

Answer 8

effort

Question 9

what is an example of a first class lever in the body and sporting example

Answer 9

tricep - tricep extension

Question 10

what is an example of a second class lever in the body and sporting example

Answer 10

gastrocnemius - calf raise

Question 11

what is an example of a third class lever in the body and sporting example

Answer 11

bicep - bicep curl

Question 12

what is mechanical advantage

Answer 12

ability to move weight with low effort

Question 13

what is mechanical disadvantage

Answer 13

ability to move weight with high effort

Question 14

what is the effort arm

Answer 14

the part of the lever to which the effort is applied

Question 15

what is the resistance arm

Answer 15

the part of the lever to which the force is applied

Question 16

mechanical advantage of first class lever

Answer 16

heavy weight, little effort (depending on load and effort distance to fulcrum)

Question 17

mechanical disadvantage of first class lever

Answer 17

low speed
short distances
limited flexibility

Question 18

mechanical advantage of second class lever

Answer 18

heavy weight, little effort (large effort arm)

Question 19

mechanical disadvantage of second class lever

Answer 19

low speed
short distances
limited flexibility

Question 20

mechanical advantage of third class lever

Answer 20

weight moved fast
wide range of movement

Question 21

mechanical disadvantage of third class lever

Answer 21

high effort to move little weight

Question 22

what is the mechanical advantage equation

Answer 22

mechanical advantage = effort arm / resistance arm

Question 23

does first class lever have high or low mechanical advantage

Answer 23

high if the fulcrum is closer to the load than the effort
low if the fulcrum is closer to the effort than the load

Question 24

does second class lever have high or low mechanical advantage

Answer 24

high - the effort arm is longer than the resistance arm

Question 25

does third class lever have high or low mechanical advantage

Answer 25

low - the effort arm is shorter than the resistance arm

Question 26

rhyme to remember levers

Answer 26

1 2 3
F L E
T G B

Question 27

analysis of rowing as a lever

Answer 27

1st class lever - fulcrum in middle
effort = biceps
load = water
fulcrum = hand/ oars

Question 28

analysis of front support as a lever

Answer 28

2nd class lever - load in middle
effort = triceps
load = body weight
fulcrum = feet

Question 29

analysis of cricket batting as a lever

Answer 29

3rd class lever - effort in middle
effort = muscles
load = bat/ ball
fulcrum = shoulders