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Physics > Year 9 (Motion, energy, effeciency, waves, color, ect.) > Flashcards

Year 9 (Motion, energy, effeciency, waves, color, ect.) Flashcards

1
Q

what is weight?

A

weight is a force that acts towards the centre of the earth.

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2
Q

what is energy?

A

something needed for something to change or work

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3
Q

what unit is used to mesure energy?

A

Joule (J) calorie (cal)

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4
Q

what types of energy?

A

chemical,kinetic,thermal,strain,elastic potential,Gravitational potential,atomic,nuclear

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5
Q

what is the law of conservation of energy?

A

energy cannot be created or destroyed. It can only be transferred form one store to store

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6
Q

what is a vector

A

a quantity that has both a size and a direction.

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7
Q

Examples of vectors

A

Any force, velocity, displacement, momentum, and acceloration

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8
Q

what is scalar

A

a quantity that has magnitude but not a direction

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9
Q

what is magnitude

A

size

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10
Q

examples of scalars

A

mass,distance,speed

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11
Q

what is velocity

A

the speed of an object in a particular direction.

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12
Q

what is acceleration.

A

a mesure of how quickly the velocity of something is changing.

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13
Q

acceleration ==

A

(delta)speed / time

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14
Q

speed and velocity ==

A

dist/time

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15
Q

what is displacement

A

distance in a straight line ( has a direction)

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16
Q

WHat is newtons first law of motion?

A

a moving object will continue to move at the same speed unless an external force acts on it.

a stationary object will remain at rest ubnless an external force acts upon it.

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17
Q

WHat is weight?

A

weight is a force that acts towards the centre of the earth

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18
Q

WHat are all forces mesured in?

A

Newtons

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19
Q

What are vector quantities?

A

quantities that have both magnitude and direction

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20
Q

What is magnitude?

A

Size

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21
Q

What is Mass?

A

mass mesures the amount of matter in something and doesnt have a direction.

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22
Q

What are scalar quantities?

A

quantities that have size but not direction

23
Q

What are examples of vectors ?

A

Forces, velocity, displacement, momentum and acceloration

24
Q

what are examples of scalars?

A

distance, speed,mass,energy

25
Q

What is displacement?

A

the distance covered in a straight line

26
Q

What is speed?

A

A mesure of disance an object travels in a given time.

27
Q

What is the velocity/speed equation?

A

dist/time

28
Q

WHat is the acceleration equation?

A

delta speed/ time

29
Q

what is an independant variabke?

A

the thing you change

30
Q

What is the dependdent variable

A

the thing you mesure

31
Q

what is the control variable?

A

somethingyou keep the same

32
Q

what are quantities?

A

things we can mesure

33
Q

what is energy

A

the capacity to do something it cant be created or destroyed, only transfered from one source to anotther

34
Q

What are forms of energy called?

A

STores

35
Q

what are some types of energy

A

elastic potential, nuclear thermal, kinetic, vibrational,chemical, gravitational potention

36
Q

what is efficiency?

A

Efficiency is a measure of how good a machine/process is at transferring energy into useful forms.

37
Q

whats the equation for efficiency?

A

usefulenergy/totalenergy

38
Q

What do waves do?

A

they transfer energy/ information without transferring matter!

39
Q

WHat is the amplitude?

A

the distance between the middle line and a crest
the maximum displacement of a wave particle from equilibrium [metres]

40
Q

What is wavlenth

A

the distance from crest to crest
the distance between one crest/trough to the next crest/trough

41
Q

Transverse

A

the oscillations are perpendicular to the wave’s direction of travel

42
Q

Longitudal

A

the oscillations are parallel to the wave’s direction of travel

43
Q

Frequency in waves

A

how many waves pass every second [Hertz

44
Q

Speed in waves

A

how fast a wave travels [metres per second]

45
Q

Speed of a wave equation

A

v = f x λ

46
Q

What is ultra sound?

A

sound over 20khs (humans cant hear)

47
Q

WHat is darkness?

A

the absence of light

48
Q

Why do we have colors?

A

Certain colours can be seen because different materials reflect certain frequencies of light.

49
Q

Diffuse reflection

A

Materials with rough surfaces reflect light in all directions. We call this…

50
Q

Specular relection

A

Highly polished materials, like mirrors, or my car, reflect light evenly. This is known as…​

51
Q

Diffusion

A

Spreading out of ( High concentration - Low)

52
Q

Visible spectrum

A

The range of colors/ light we can see

53
Q

How does color reflection work?

A

If soething is a certain color, it absorbs all other frequencies of light then that color. It reflects the color is appears as, that how we can see it.

Physics (7 decks)

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