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Science Exam
Semester 2
38
Science
9th Grade
11/10/2012

Additional Science Flashcards

 


 

Cards

Term
What is Efficiency
Definition
How much useful output energy is produced from the input energy
Term
What is the structure of the iris
Definition
A circular sheet of muscle that can expand or contract
Term
What is the function of the iris
Definition
Regulates the amount of light entering the eye by expanding or contraction to change the pupil size
Term
What is the structure of the pupil
Definition
Circular hole in the centre of the iris
Term
What is the function of the pupil
Definition
Allows light to pass to the retina
Term
What is the structure of the lens
Definition
A transperent jelly - like biconvex disc
Term
What is the stucture of the cornea
Definition
A transperent disc on the front of the eye
Term
What is the structure of the aqueous humour
Definition
Transperent watery liquid in the front of the eye
Term
What is the function of the aqueous humour
Definition
Supplies nutrients and oxygen to the lens and cornea
Term
What is the structure of the optic nerve
Definition
Thick nerve at the rear of the retina
Term
What is the function of the optic nerve
Definition
Carries electrical messages to the brain
Term
What is the structure of the ciliary muscle
Definition
Ring of muscle around the lens
Term
What is the structure of the vitrous humour
Definition
A thick, transperent jelly - like contents at the back of the eye
Term
What is the function of the vitreous humour
Definition
Keeps the shape of the eye
Term
What is a non - contact force
Definition
A force that repels from one another
Term
What is weight
Definition
Weight is the amount by which your mass is pulled downwards by gravity
Term
What is the law of conservation of matter
Definition
A principle that matter cannot be created or destroyed in a isolated area
Term
What is force best described as
Definition
A push or pull
Term
What is force measured in
Definition
Newtons
Term
What is the formula for kinetic energy
Definition
EK = 1/2 M V2
Term
What is the formula for potenial energy
Definition

Ep = M G ΔH

 

 

Term
What is the formula for force
Definition
F= M x A
Term
What is the formula for Power
Definition
P = W/T or E/T
Term
What is the formula for work
Definition
W = F x S
Term
What is contact force
Definition
Contact force is when objects make contact with one another. They exert a force on one another
Term
What is the function of the ciliary muscle
Definition
Changes the shape of the lens to llow focusing on near or far objects
Term
What is the function of the cornea
Definition
Allows light to enter the eye to refract the light so that it can focus on the retina
Term
What is the formula for efficiency
Definition
Useful output energy in joules/input energy in joules
Term
What is energy
Definition
The strength and vitality required for sustained physical and mental activity
Term
What is work
Definition
A activity involving mental or physical effort done in order to achieve a purpose or activity
Term
What are some examples in which energy comes from
Definition
Nuclear,Hydro, Solar, Chemical, Geothermal, Fossil Fuels
Term
How is energy transferred
Definition
Energy is carried on very small particles such as electrons
Term
What are mechanical waves
Definition
Waves that involve particles and need a medium of travel
Term
What are electromagentic waves
Definition
Waves that don't involve particles and don't need a medium of travel
Term
What is the function of the lens
Definition
Does the fine focusing of light onto the retina
Term
What is the structure of the retina
Definition
Layer of nerve tissue at the back of the eye
Term
What is the function of the retina
Definition
Converts light into eectrical signals and detects light of different frequencies to allow colour vision
Term
What is input energy
Definition
The enrgy that is put into the device
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