Properties of Materials
Structures
Center of Gravity
Levers
Simple Machines
100
Name a fanric that is natural (comes from nature)
Wool, silk, cotton
100
What are the three things all structures have in common?
they are built to do a job
they support load
they have a shape
100
Where is the center of gravity on your body?
Just below your bellybutton
100
What is a Lever?
A simple machine that sconsists of a bar that pivots on a fixed point.
100
Give 2 examples where a pulley is used
Flagpole, window blinds, crane, elevator
200
A material that does not allow light to pass through it is known as...
opaque
200
True or False.
Sturctures can either be natural or man made?
TRUE
200
True or False.
The Center of gravity does not change every time you move or bend your body in different shapes.
FALSE
200
Where is the fulcrum in a first class lever?
Between the effort and the load
200
Name 6 kinds of simple machines
inclined plane, lever, pulley, wedge, screw, wheel and axle
300
Which of the following properties should be considered when making a toy boat.
magnetic material
ability to float
waterproof
ability to float
waterproof
300
This pictures shows what typeof structure?
Shell
300
What are the two factors that affect the stability of an object?
Width of the base of the object
Center of Gravity
300
Give and example of a third class lever.
fishing rod, shovel, tongs, tweezers
300
What kind of simple machine can help someone in a wheelchair get from the 1st floor to the 2nd floor
inclined plane
400
True or False.
Metals are poor conductors of heat and electricity.
FALSE
400
What are the three types of Structures?
solid
shell
frame
400
Name two features you can use to make a structure strong/stable
Truss, beams, arch, dome
400
What do these letters stand for when talking about levers?
E
L
F
Effort
Load
Fulcrum
400
Why do simple machines have few or no moving parts?
so they are simple and easy to use
500
Jack would like to build a shed in his backyard. He needs to use a material that is strong and durable and would prefer a natural materials. What should he use?
Wood
500
What are 4 factors that can cause a structure to fail?
Improper construction
Material failure
Poor design
Applying loads to large for the structure
500
The Center of Gravity depends on the _____________ of the object and how its ________________ is distributed.
shape, mass
500
What class of lever is a wheelbarrow. explain where the load, effort and fulcrum are located
wheelbarrow is a 2nd class lever.
effort is the handles
load is the bucket
the fulcrum is the wheel
500
What type of simple machine is a knife?
wedge