Science Final Flashcards
(16 cards)
What is a pure substance
A substance that contains only one substance, one constituent. Distilled water, sugar, iron, copper, and diamonds are examples of a pure substance
What are all the mechanical constraints
•Compression:force that tends to crush
•tension: force that tend to stretch a material Ex: walking your dog
•torsion: force that twist an object/ material Ex: ringing out a towel
•deflection: force that tends to Ben a material
•shearing: force that tends to cut a material Ex: scissors cutting paper
What are the mechanical properties of materials
•Hardness: ability to resist indentation
•elasticity: ability to return to its original shape after undergoing a constraint
•ductility: ability to stretch without breaking
•Malleability: ability to be flattened or bent without breaking
•corrosion resistance : will not rust
What are the components of electricity
•POWER SUPPLY: produces/ supply’s the electric current Ex: battery
•CONTROL: function used to open or close a circuit Ex: light switch
•PROTECTION: function that can automatically stop the flow of the electric current in a abnormal situation Ex: fuses or breakers
•CONDUCTION: function performed that allows curry to flow through wires Ex: wires, circuit board, or metals and alloys
•INSULATION: function of any electrical component able to block an electrical curren Ex: rubber coating on a wire
What are the 6 components of nutrition ( look what they’re functions are in notes)
•carbs:
•fats
•proteins
•water
•vitamins
•minerals
What is the role of the digestive system
•the decomposition (breaking down) of food sources
•the absorption of nutrients and water( nutrients mostly in small intestine; water in large intestine)
•the elimination of water products
What is the difference between chemical and mechanical digestion
(ex in notes)
•Mechanical breaks food into smaller pieces without modifying their nature
•Chemical breaks apart complex molecules into simpler molecules with the help of digestive juices
How are molecules formed
Atoms combine with other atoms to form molecules
What is the formula for calculating concentration
M
C=—
V
C= concentration
M=mass
V= Volume
What type of scales are these
1: 1:25
2: 1:1
3: 25:1
1= scale reduction: measure of the drawing in relation to the real measurement is 25 times smaller
2= full size: measure is the same as drawing size
3= scale increase: measure is 25 times bigger than drawing size
What is dimensioning and what lines are used in dimensioning
•Dimensioning is the process of indicating the real dimensions of an object on a sheet of paper and the real measurement of the object.
•Dimensioning uses dimension lines and extension lines to indicate the measurement of dimensions
how do you calculate tolerances
EX: ø=38≠3
Minimum= 38-3=35mm
Maximum = 38+3=41mm
What is guiding
Guiding is the basic mechanical function of any component/ part that controls motion of one ( or several) moving parts : guide is a part that does the guiding
What is linking ( look in notes for 4 characteristics of linking)
A link holds two two parts together
If a gear A is smaller and has less teeth and gear B is bigger with more teeth which gear will move faster
Gear A will move faster
What is density formula
M
ρ=—
abl
