Glossary

Question 1

Effort

Answer 1

Force applied to a lever to overcome the load

Question 2

First class lever

Answer 2

lever with effort and loads located at each end and fulcrum in the centre

Question 3

Force multiplier

Answer 3

machine that increases the force applied for a task such as a first class lever

Question 4

Fulcrum

Answer 4

Point about which a lever pivots

Question 5

Lever

Answer 5

Simple machine consisting of a rigid rod that pivots about a point

Question 6

Load

Answer 6

force that a lever is used to overcome

Question 7

mechanical advantage

Answer 7

ration of a load force to the effort force used by a machine

Question 8

second class lever

Answer 8

lever with the fulcrum located at one end, the effort at the other and load in the center

Question 9

simple machine

Answer 9

a device that makes work easier by changing the size or direction of force

Question 10

speed multiplier

Answer 10

machine that requires a small movement of an effort to produce a large movement of a load such as a third class lever

Question 11

third class lever

Answer 11

lever with the fulcrum located at one end with the load at the other and the effort at the centre

Question 12

inclined plane

Answer 12

a simple machine that reduces the effort needed to lift a load by increasing the distance it acts

Question 13

pitch

Answer 13

distance between adjacent threads on a screw

Question 14

ramp

Answer 14

an inclined plane used to help life an object

Question 15

screw

Answer 15

a spiral shaped inclined plane

Question 16

wedge

Answer 16

a double inclined plane such as a knife or axe

Question 17

axle

Answer 17

shaft on which a wheel rotates

Question 18

block and tackle

Answer 18

a system of two or more pulleys using rope or cable to lift heavy objects

Question 19

driven gear

Answer 19

the gear that receives force from a driving gear

Question 20

driving gear

Answer 20

the gear that supplies force to another gear

Question 21

gear ratio

Answer 21

ration of the number of teeth on the driving gear and the number of teeth on the driven gear

Question 22

gear train

Answer 22

a system of interconnected gears

Question 23

gears

Answer 23

a wheel with teeth used to turn another gear wheel

Question 24

pulley

Answer 24

a wheel with a groove over which a rope or cable can slide used to change the direction of a force

Question 25

rim

Answer 25

outer edge of a wheel

Question 26

sprocket

Answer 26

a toothed wheel used to link onto a chain on a bike

Question 27

wheel

Answer 27

type of lever with an axle acting as its fulcrum