US WORK / EXAMPLES
LEVER / A stiff bar that rests on a support called a fulcrum / Lifts or
moves loads / Shovel, nutcracker, seesaw,crowbar,elbow,tweezers,bottle opener
INCLINED PLANE / A slanting surface connecting a lower level to a higher level / Things move up or down it / Slide, stairs, ramp, escalator, slope, fan blades
WHEEL AND AXLE / A wheel with a rod, called an axel, through its center: both parts move together / Lifts or moves loads / Car, wagon, doorknob, pencil sharpener, bike
SCREW / An inclined plane wrapped around a pole / Holds things together or lifts / Screw, jar lid, vise, bolt, drill, corkscrew
PULLEY / A grooved wheel with a rope or cable around it / Moves things up, down, or across / Curtain rod, tow truck, mini-blind, flag pole, crane
WEDGE / An object with at least one slanting side ending in a sharp edge / Cuts or spreads an object apart / Knife, pin, nail, chisel,ax, snowplow, front of a boat
STUDY CHART
1)What is force?
2)What is a complicated machine?
3)What is a simple machine?
4)List the six simple machines.
5)Which simple machine is an inclined plane wrapped around a pole?
6)Which simple machine is two inclined planes put together
7)What kind of simple machine does a flag pole use?
8)What simple machine is a wheel with teeth on it?
9)What simple machine is a flat surface that goes from a lower level to a higher level?
10)What simple machine has a fulcrum?
11)What simple machine cuts of separates into parts?
12)What three ways do machines help us work?
13)What is work?
14)What is a see saw an example of?
15)What type of simple machine are stairs?
16)What type of simple machine is the top of a jar?
17)What allows cars to roll?
18)Give 5 examples of levers.
19)Give 5 examples of wheels and axles.
20)Give 5 examples of wedges.
21)Give 5 examples of screws.
22)Give 5 examples of inclined planes.
23)What is friction?
24)What is gravity?
1)A push or pull
2)A machine with many parts
3)A machine with few parts
4)Screw, lever, inclined plane, wedge, wheel & axle, pulley
5)Screw
6)Wedge
7)pulley
8)gear
9)inclined plane
10)lever
11)wedge
12)reduce friction, change the amount of force needed, or change the direction of the force
13)force used to move an object
14)lever
15)inclined plane
16)screw
17)wheel & axle
18)see chart
19)see chart
20)see chart
21)see chart
22)see chart
23)the force that slows down or stops moving objects
24)the force that pulls objects down