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Block Science > Unit Four Exam > Flashcards

Unit Four Exam Flashcards

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1
Q

What is work and it’s units

A

Energy used to move a distance, measured in joules

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2
Q

What is the formula for work

A

Force X distance

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3
Q

What things will affect the amount of work done

A

Force and distance

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4
Q

What is power and it’s units

A

Rate at which work is done, how fast

Measured in watts

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5
Q

What is the formulas for power

A

Force X d/ t

W/t

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6
Q

What are the different forms of energy

A

Kinetic and potential

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7
Q

What are examples of kinetic and potential energy

A

Kinetic: Heat, light, sound, mechanical
Potential: chemical, nuclear

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8
Q

What is the law of conservation of energy

A

Energy can’t be created or destroyed only converted into one form or another

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9
Q

What type of energy transformation is a boy eating an apple then walking to work

A

Chemical to mechanical

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10
Q

What type of energy transformation is gasoline in your car used to drive

A

Chemical to mechanical

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11
Q

What type of energy transformation is turning on a light

A

Electric to light

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12
Q

What type of energy transformation is hair dryer being turned on

A

Electric to heat

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13
Q

If two people collide how does the amount of energy before the collision compare to after and what law is this

A

It is the same and it is the law of conservation of energy

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14
Q

Why is the amount of potential energy at the top of a roller coaster I’ll is not the same as kinetic energy at the bottom of the hill

A

The energy at the bottom is slightly less because some was converted to hear by friction

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15
Q

What is kinetic energy, and units

A

Energy of motion and it is measured in joules

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16
Q

Formula for kinetic energy

A

KE= 1/2m v(2)

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17
Q

What is potential energy, what is it measured in

A

Stored energy. Joules

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18
Q

What is the formula for potential energy

A 
P= w * h 
P= h X m X g
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19
Q

What is a medium and give three examples

A

The material that gets disturbed, through which a wave travels
Air, water, steel

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20
Q

Electromagnetic waves are fastest in what medium

A

Vacuum, no medium

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21
Q

What type of wave is a sound wave

A

Longitudinal

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22
Q

What type of wave is a light wave

A

Electromagnetic transversal

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23
Q

What type of waves are electromagnetic waves

A

Transverse waves, disrupt the electrical and magnetic field, radio, heat waves, visible, uv, X-Ray, gamma

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24
Q

What is the formula for wave speed,

A

V= f X wl

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25
Q

What is the formula for wavelength

A

Wl= v/f

26
Q

What is the formula for frequency

A

F = v/wl

27
Q

What are the units for frequency, wavelength, and wave speed

A

Frequency= hz
Wavelength= m
Wave speed= m/s

28
Q

What is it called when a wave bends as it goes from one medium to another

A

Refraction

29
Q

List the energies of the electromagnetic spectrum in order from longest to shortest wavelength

A

Radio, tv, micro, infared, visible, ultraviolet, X-Ray, gamma

30
Q

What is period

A

Period is how fast it takes for one wave to pass in seconds

31
Q

What is frequency

A

Frequency is how many waves pass per second

32
Q

What is the formula for frequency

A

1/p

33
Q

What is the formula for period

A

1/f

34
Q

What type of wave travels fastest in solids

A

Longitudinal

35
Q

In music the term pitch is what

A

Frequency

36
Q

What types of EM radiation are used to fight cancer

A

Gamma

37
Q

What are ultrasounds used for and what type of waves do they use

A

Ultrasonic and to see babies and internal organs

38
Q

What type of wave is harmful to our skin but also beneficial in small amounts

A

Ultraviolet, can cause burns or skin cancer but also gives us vitamin d

39
Q

What is the Doppler effect

A

Change in frequency due to motion

40
Q

Will sound intensity increase or decrease as you move closer to the noise

A

Increase

41
Q

What is an echo

A

Reflection of sound wave odd a smooth surface

42
Q

What is reflection

A

Waves bouncing off flat, smooth surface

43
Q

Why do we hear thunder after the lightning flash

A

Sound is slower than light

44
Q

Why is the sky blue

A

Small molecules scatter blue and violet light around up in the atmosphere. We don’t see violet very well so it looks blue

45
Q

Why are sunsets red

A

At sunset light travels through so much atmosphere to reach your eye that by the time it gets there all the blue has been scattered and only longer wave lengths get through.

46
Q

What is current

A

Flow, more current= faster electrons

47
Q

What is voltage

A

Electrical pressure ( how much energy each electron has) created by difference in electron pressure

48
Q

What is resistance and give an example of a resistor

A

Opposition to the flow of electrons, an example is an insulator, wore thin or long

49
Q

What is static electricity

A

Non flowing electrons

50
Q

What is electric current

A

Flow of electron

51
Q

What is coloumbs law

A

The force between the charges particles is directly proportional to amount of charge and inversely proportional to distance squared

52
Q

What is coloumbs law formula

A

D(2)

53
Q

What does coloumbs law say about distance and strength of attractions between chargers

A

If the amount of charge on two particles doubled then force between them is twice as much, if the distance between two particles is doubled the force between them is 1/4 of what it was before

54
Q

What happens to the strength of attraction between two charged particles if the distance is doubled

A

The force between them is 1/4 of what it was before

55
Q

What if distance is cut in half

A

Then the force is four times as much

56
Q

What if the strength of one charge doubles

A

Then the force is doubled

57
Q

What if strength of both charges doubles

A

The force between them is quadrupled

58
Q

What is a series

A

When it’s one loop, only one path, If light is taken out then it doesn’t work

59
Q

What is a parallel

A

More than one path, If a light is taken out the others still light

60
Q

What is energy

A

The ability to do work

Block Science (33 decks)

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