Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
33 Cards in this Set
- Front
- Back
|
Energy
|
the ability to cause change in matter
|
|
|
potential energy
|
stored energy that is due to the position or condition of the object. The higher the object than the greater this is.
|
|
|
kinetic energy
|
the energy of motion - this increases as potential energy decreases
|
|
|
Forms of energy
|
light, sound, thermal (heat), chemical and electrical- one form can be tranferred to another -
|
|
|
Law of Conservation of Energy
|
the total amount of energy in a system is always the same. Energy cannot be created or destroyed. Energy just changes form.
|
|
|
Chemical Energy
|
is not produced when fossil fuels (oil) are burned at a generating plant
|
|
|
Wave
|
a disturbance that carries energy through matter and space
|
|
|
Wave have two parts
|
crest and the trough
|
|
|
crest
|
the higher part of the wave - the first part
|
|
|
trough
|
the second part of the wave - the low part
|
|
|
Wavelength
|
measured from crest to crest
|
|
|
Amplitude
|
the distance matter is displaced from its resting positon to produce a wave(how high it is)
|
|
|
How are sound waves different from water waves?
|
Sound is made through vibrations. Air molecules will compress, or squeeze together,forming the compression part of the sound wave
|
|
|
What is a sound wave made up of?
|
One compression and one rarefication. The rarefication is the second part of a sound wave, the particles are far apart.
|
|
|
frequency
|
The numer of times the string vibrates in a given amoujnt of time. When a string vibrates, every vibration starts another sound wave.
|
|
|
What happens when the frequency of a wave is higher
|
The pitch will be higher
|
|
|
How can sound waves be different?
|
A guitar's sound is made from vibrating strings but a clarinet's sound is made by vibrating air and a drum produces sound as it's tightly stretched head vibrates.
|
|
|
Reflection
|
the bouncing off of light on a surface. The smoother the surface the more light will bounce off
|
|
|
Visible light
|
this appears white but it is a mixture of different wavelenghts of light.
|
|
|
What happens when white light passes through a prism
|
a spectrum of light is produced.
|
|
|
As the light breaks up in a prism
|
the shortest wavelength of light bends the most and the longest wavelength bends the least.
|
|
|
Violet Light
|
Bends the most so it has the shortest wavelength.
|
|
|
How is the color of an object determined?
|
It depends on which wavelength of light the object reflects. For example - a red marker looks red because it reflects red light and absorbs all the other colors.
|
|
|
Which color object would absorb all the wavelengths of light?
|
a black one - that is why black asphalt is so hot on a sunny day
|
|
|
Which color object would reflect all wavelenght of light?
|
A white one
|
|
|
Which does light travel faster through? water or air -
|
Air - for example when you shine a flashlight through a fish tank the light will slow down as it hits the water
|
|
|
transparent
|
material allows most of the light to pass through it example a clear window
|
|
|
translucent
|
material allows some light to passs through - example sunglasses
|
|
|
opaque
|
doesn't allow any light to pass through - example woods and metals
|
|
|
electromagnetic spectrum
|
all energy waves that travel at the speed of light in a vacuum, includes radio, infrared, visible, ultraviolet, xrays and gamma rays.
|
|
|
diffraction
|
the bending of light around the edge of an object
|
|
|
refraction
|
the bending of light as it passes from one material top another
|
|
|
reflection
|
the bouncing of light off a surface
|
