all sciences Flashcards

i refuse to fail

1
Q

what is a wave

A

A rythmic disturbance that transfers energy through matter or space

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2
Q

What are the two general types of waves

A

Mechanical and electromagnetic

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2
Q

what are the types of mechanical waves

A

Transverse and longitidual

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3
Q

what is a mechanical wave

A

a type of wave that requires matter to travel through

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4
Q

what are examples of a medium

A

An earth quake or rope

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5
Q

what is a transverse

A

A type of mechanical wave that move through mediums at right angles

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6
Q

what is longitudual

A

a type of mechanical wave when vibration is parallel to the direct motion

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7
Q

what is frequency and its symbol and its unit

A

The frequency of a wave is a measure of the number of oscilations of the wave per second symbol (f) unit hertzs

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8
Q

what is periodic time

A

the periodic time of a wave (T) is the time taken forone complete cycle period = 1/f

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9
Q

what is amplitude

A

maximum displacement from moon position for either side Measured in me

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10
Q

what is wave length

A

the distance between two points on a wave train

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11
Q

what is the formula for speed

A

speed = d/t

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12
Q

what is the formula for displacement

A

d final - d initial

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13
Q

what is the formula for velocity

A

displacement/time

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14
Q

what is veloctity

A

The rate at which an object changes position

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15
Q

what is stopping distance

A

the minimum distance required to stop a vehicle in an emergency

16
Q

what is the formula for distance

A

speed x time

17
Q

what is thinking distance

A

the amount of time it takes a driver to react and stop a vehicle

18
Q

what is the formula for thinking distance

A

speed x time

19
Q

what is the formula for stopping distance

A

thinking distance +breaking distance

20
Q

what is braking distance

A

depends on how fast a vehicle is travelling before the brakes are applied, and is proportional to the square of the initial speed#

21
Q

Newtons first law

A

In the first law, an object will not change its motion unless a force acts on it

22
Q

Newton second law

A

In the second law, the force on an object is equal to its mass times its acceleration

23
Q

newton 3rd law

A

n the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction.

24
What are carbohydrates and what is their importance
sugar molecules and they provide the body with glucose for energy production
25
what are proteins and what is their importance
A molecule made up of amino acids. and they are used to repair body tissues
26
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
27
How does one test for glucose (reducing sugar )
Using benedicts solution (brick red)
28
How does one test for starch
Using Iodine (if positive blue black )
29
How does on test for protein
Using buiret solution ( if positive the color will be purple)
30
Test for lipids?
get a food sample and mix with ethanol (cloudy emulasion