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Flashcards in Science 2 Deck (47):
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Mechanical energy

The energy of moving objects or objects with moving parts

1

Mechanical energy examples

Moving vehicles, machinery, balls and wind

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Thermal energy

Things are got because their atoms and molecules are vibrating

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Thermal energy examples

Any object that has a temperature above -273* Celsius has thermal energy

4

Sound energy

Vibrating objects cause sound waves in the air which travels to the ear

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Sound energy examples

Drums, speakers, voices

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Gravitational potential energy

A raised object has the ability to to fall and cause damage

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Examples of gravitational potential energy

Water in a dam, anything held off the ground

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Elastic potential energy

A stretched or squashed object will move and exert a force as it returns to its natural shape

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Example of elastic potential energy

Bent branch, spring, squashed pillow

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Chemical potential energy

The chemical that make things give out light or heat under certain conditions

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Example of chemical potential energy

Gas for cooking, paper, food, dynamite

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Electrical energy

The energy that electrons have when they are forced to move by an electric charge

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Example of electrical energy

Electricity from a battery, generator, lightning

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Light energy

Any form of electromagnetic radiation given off by light, laser, star, etc

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Example of light energy

Light from the sun, UV radiation, microwaves, x-ray

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Eletrical to kinetic energy

Food mixer

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Light energy to electrical energy

Solar panels

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Electrical energy to both sound energy and light energy

TV

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Chemical energy to heat energy

Gas fire

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Kinetic energy to elastic potential energy

Jumping on a trampoline

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Mechanical energy to electrical energy

Electric generator

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Electrical energy to gravitational potential energy

Escalator

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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

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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

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How to you calculate electrical power?

Power= current (input) x volts

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How do you find percentage efficiency?

Bounce height
-------------------- x 100
Drop height

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What is a pulse?

A pulse is a single disturbance

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What is a wave?

A wave is a repetitive motion

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Why do waves need a medium?

Because it needs a material to disturb to send the wave

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How do you figure out speed?

Distance
Speed = -----------
Time

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What is a sound wave?

A regular vibration passed through a medium to our ears, it is a longitudinal wave

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How is a loud sound different from a soft sound?

Loud sounds vibrate more than soft sounds

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What unit is sound frequency measured in?

Hurtz

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What range of frequencies can humans hear on average?

20-20,000 Hz

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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.

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What unit is loudness measured in?

Decibels
dB

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Situations that would give a 30dB sound?

Quiet room, no background noise

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Situation that would give a 40dB sound?

Quiet room with background noise

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Situation that would give a 50 dB sound

Quiet murmuring

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Situation that would give a 60dB sound

Normal conversation

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Situation that would give a 70dB sound

Louder talking

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Situation that would give 80dB sound

Noisy working class room

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Situation that would give a 90dB sound

Machinery

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Situation that would give a 100dB sound

Loud concert

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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)

46

What are the symbols for a cell(battery), light globe, wires, ammeter and voltmeter along with series and parallel lights

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