Science 2 Flashcards
Mechanical energy examples
Moving vehicles, machinery, balls and wind
Mechanical energy
The energy of moving objects or objects with moving parts
Thermal energy
Things are got because their atoms and molecules are vibrating
Thermal energy examples
Any object that has a temperature above -273* Celsius has thermal energy
Sound energy
Vibrating objects cause sound waves in the air which travels to the ear
Sound energy examples
Drums, speakers, voices
Gravitational potential energy
A raised object has the ability to to fall and cause damage
Examples of gravitational potential energy
Water in a dam, anything held off the ground
Elastic potential energy
A stretched or squashed object will move and exert a force as it returns to its natural shape
Example of elastic potential energy
Bent branch, spring, squashed pillow
Chemical potential energy
The chemical that make things give out light or heat under certain conditions
Example of chemical potential energy
Gas for cooking, paper, food, dynamite
Electrical energy
The energy that electrons have when they are forced to move by an electric charge
Example of electrical energy
Electricity from a battery, generator, lightning
Light energy
Any form of electromagnetic radiation given off by light, laser, star, etc
Example of light energy
Light from the sun, UV radiation, microwaves, x-ray
Eletrical to kinetic energy
Food mixer
Light energy to electrical energy
Solar panels
Electrical energy to both sound energy and light energy
TV
Chemical energy to heat energy
Gas fire
Kinetic energy to elastic potential energy
Jumping on a trampoline
Mechanical energy to electrical energy
Electric generator
Electrical energy to gravitational potential energy
Escalator
If you wanted to test energy efficiency with a solar panel what are three variables that you could test
Light amount, temperature, type of motor
Why is it important to test one variable at a time?
To get the most accurate results on each variable to come out with the best outcome
How to you calculate electrical power?
Power= current (input) x volts
How do you find percentage efficiency?
Bounce height
——————– x 100
Drop height
What is a pulse?
A pulse is a single disturbance
What is a wave?
A wave is a repetitive motion
Why do waves need a medium?
Because it needs a material to disturb to send the wave
How do you figure out speed?
Distance
Speed = ———–
Time
What is a sound wave?
A regular vibration passed through a medium to our ears, it is a longitudinal wave
How is a loud sound different from a soft sound?
Loud sounds vibrate more than soft sounds
What unit is sound frequency measured in?
Hurtz
What range of frequencies can humans hear on average?
20-20,000 Hz
What is the difference between high frequency sounds and low frequency sounds?
A high frequency sound has more vibrations per second compared to a lower frequency sound.
What unit is loudness measured in?
Decibels
dB
Situations that would give a 30dB sound?
Quiet room, no background noise
Situation that would give a 40dB sound?
Quiet room with background noise
Situation that would give a 50 dB sound
Quiet murmuring
Situation that would give a 60dB sound
Normal conversation
Situation that would give a 70dB sound
Louder talking
Situation that would give 80dB sound
Noisy working class room
Situation that would give a 90dB sound
Machinery
Situation that would give a 100dB sound
Loud concert
What are the important parts to label on an ear diagram and where do they go? Make sure you can draw an ear
Outer ear - ear canal
Middle ear - ear drum, 3 ossicles, small window
Inner ear - cochlea, auditory nerve (to the brain)
What are the symbols for a cell(battery), light globe, wires, ammeter and voltmeter along with series and parallel lights
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