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EXAM > Science 2 > Flashcards

Science 2 Flashcards

0
Q

Mechanical energy examples

A

Moving vehicles, machinery, balls and wind

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1
Q

Mechanical energy

A

The energy of moving objects or objects with moving parts

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2
Q

Thermal energy

A

Things are got because their atoms and molecules are vibrating

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3
Q

Thermal energy examples

A

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

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4
Q

Sound energy

A

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

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5
Q

Sound energy examples

A

Drums, speakers, voices

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6
Q

Gravitational potential energy

A

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

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7
Q

Examples of gravitational potential energy

A

Water in a dam, anything held off the ground

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8
Q

Elastic potential energy

A

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

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9
Q

Example of elastic potential energy

A

Bent branch, spring, squashed pillow

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10
Q

Chemical potential energy

A

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

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11
Q

Example of chemical potential energy

A

Gas for cooking, paper, food, dynamite

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12
Q

Electrical energy

A

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

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13
Q

Example of electrical energy

A

Electricity from a battery, generator, lightning

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14
Q

Light energy

A

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

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15
Q

Example of light energy

A

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

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16
Q

Eletrical to kinetic energy

A

Food mixer

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17
Q

Light energy to electrical energy

A

Solar panels

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18
Q

Electrical energy to both sound energy and light energy

A

TV

19
Q

Chemical energy to heat energy

A

Gas fire

20
Q

Kinetic energy to elastic potential energy

A

Jumping on a trampoline

21
Q

Mechanical energy to electrical energy

A

Electric generator

22
Q

Electrical energy to gravitational potential energy

A

Escalator

23
Q

If you wanted to test energy efficiency with a solar panel what are three variables that you could test

A

Light amount, temperature, type of motor

24
Q

Why is it important to test one variable at a time?

A

To get the most accurate results on each variable to come out with the best outcome

25
Q

How to you calculate electrical power?

A

Power= current (input) x volts

26
Q

How do you find percentage efficiency?

A

Bounce height
——————– x 100
Drop height

27
Q

What is a pulse?

A

A pulse is a single disturbance

28
Q

What is a wave?

A

A wave is a repetitive motion

29
Q

Why do waves need a medium?

A

Because it needs a material to disturb to send the wave

30
Q

How do you figure out speed?

A

Distance
Speed = ———–
Time

31
Q

What is a sound wave?

A

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

32
Q

How is a loud sound different from a soft sound?

A

Loud sounds vibrate more than soft sounds

33
Q

What unit is sound frequency measured in?

A

Hurtz

34
Q

What range of frequencies can humans hear on average?

A

20-20,000 Hz

35
Q

What is the difference between high frequency sounds and low frequency sounds?

A

A high frequency sound has more vibrations per second compared to a lower frequency sound.

36
Q

What unit is loudness measured in?

A

Decibels

dB

37
Q

Situations that would give a 30dB sound?

A

Quiet room, no background noise

38
Q

Situation that would give a 40dB sound?

A

Quiet room with background noise

39
Q

Situation that would give a 50 dB sound

A

Quiet murmuring

40
Q

Situation that would give a 60dB sound

A

Normal conversation

41
Q

Situation that would give a 70dB sound

A

Louder talking

42
Q

Situation that would give 80dB sound

A

Noisy working class room

43
Q

Situation that would give a 90dB sound

A

Machinery

44
Q

Situation that would give a 100dB sound

A

Loud concert

45
Q

What are the important parts to label on an ear diagram and where do they go? Make sure you can draw an ear

A

Outer ear - ear canal
Middle ear - ear drum, 3 ossicles, small window
Inner ear - cochlea, auditory nerve (to the brain)

46
Q

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

A

.

EXAM (33 decks)

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