Term 1 Exam Yr 9 Flashcards
What is the Law of Conservation of Matter
Law of Conservation of matter states that matter can not be created or destroyed but changes state or form.
Law of conservation of energy
The Law of Conservation of energy states that energy can never be created or destroyed. It can only be converted from one form to another.
Definition of Heat
Heatis the transfer of thermal energy between objects with different temperatures
Defintion of Temperature
Temperatureis a measure of how hot something is (amount of kinetic energy)
3 ways temp is measured
Measured inCelsius(°C),Kelvin(K),Fahrenheit(°F),
What is Conduction
For conduction to occur the substances must be in direct contact
This process of heat transfer by vibrating particles is called conduction.
What is Convection ?
Heat is transferred by convection in liquids and gases because their particles can move around.
Creates a convection current.
What is Radiation
Radiation is the transfer of heat that does not reply on contact the energy can travel through empty space( a vacuum)
What is an insulator
Plastic, air, cloth, wood and rubber are poor conductors of heat and can sometimes block heat transfer completely.
What is an Conductor
Substances that transfer heat easily are conductors.
Some substances are better than others:
Silver, gold, aluminium and
copper are good conductors
of heat.
What are the two types of waves
Longitudinal and Transverse
What is a Transverse wave
Particle movement is at right angles to the motion of the wave. Perpendicular
Examples of transverse waves are heat radiation & light energy
What is a Longtudinal Wave
Longitudinal wave particles vibrate forward and backwards in the direction of the wave (parallel to the wave). They form areas of compression (close together) and rarefaction (far apart).
What is anotomy of a wave
Draw example
What is the wave equation
wave speed (m/s) = frequency (Hz) x wavelength (m)
What types of waves do not require a medium
Electromagnetic waves do not require a medium to travel.
What is the Electromagnetic spectrum
All the range and frequencies are placed on a spectrum.
There are low-energy waves and high-energy waves.
High frequency electromagnetic waves can be harmful to human health
What is refelction and refraction
Reflection is the bouncing back of light when it strikes a surface, while refraction is the bending of light as it passes from one medium to another.
What is the law of reflection
The angle of incidence is equal to the angle of reflection.
I = R
I = angle of incidence and R = angle of reflection
What is transparent matter
Transparentmatter is matter that transmits light without scattering it.
What is translucent matter
Translucentmatter is matter that transmits but scatters light.
What is opaque matter
Opaquematter is matter that does not let any light pass through it.
