all sciences Flashcards
i refuse to fail
what is a wave
A rythmic disturbance that transfers energy through matter or space
What are the two general types of waves
Mechanical and electromagnetic
what are the types of mechanical waves
Transverse and longitidual
what is a mechanical wave
a type of wave that requires matter to travel through
what are examples of a medium
An earth quake or rope
what is a transverse
A type of mechanical wave that move through mediums at right angles
what is longitudual
a type of mechanical wave when vibration is parallel to the direct motion
what is frequency and its symbol and its unit
The frequency of a wave is a measure of the number of oscilations of the wave per second symbol (f) unit hertzs
what is periodic time
the periodic time of a wave (T) is the time taken forone complete cycle period = 1/f
what is amplitude
maximum displacement from moon position for either side Measured in me
what is wave length
the distance between two points on a wave train
what is the formula for speed
speed = d/t
what is the formula for displacement
d final - d initial
what is the formula for velocity
displacement/time
what is veloctity
The rate at which an object changes position
what is stopping distance
the minimum distance required to stop a vehicle in an emergency
what is the formula for distance
speed x time
what is thinking distance
the amount of time it takes a driver to react and stop a vehicle
what is the formula for thinking distance
speed x time
what is the formula for stopping distance
thinking distance +breaking distance
what is braking distance
depends on how fast a vehicle is travelling before the brakes are applied, and is proportional to the square of the initial speed#
Newtons first law
In the first law, an object will not change its motion unless a force acts on it
Newton second law
In the second law, the force on an object is equal to its mass times its acceleration
newton 3rd law
n the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction.
What are carbohydrates and what is their importance
sugar molecules and they provide the body with glucose for energy production
what are proteins and what is their importance
A molecule made up of amino acids. and they are used to repair body tissues
what are li[ids and why are they important
Lipids are a class of organic compounds that are insoluble in water but soluble in organic solvents like alcohol and acetone.
maintain temperature and insulate the body
How does one test for glucose (reducing sugar )
Using benedicts solution (brick red)
How does one test for starch
Using Iodine (if positive blue black )
How does on test for protein
Using buiret solution ( if positive the color will be purple)
Test for lipids?
get a food sample and mix with ethanol (cloudy emulasion
