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

Question 1

what is weight?

Answer 1

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

Question 2

what is energy?

Answer 2

something needed for something to change or work

Question 3

what unit is used to mesure energy?

Answer 3

Joule (J) calorie (cal)

Question 4

what types of energy?

Answer 4

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

Question 5

what is the law of conservation of energy?

Answer 5

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

Question 6

what is a vector

Answer 6

a quantity that has both a size and a direction.

Question 7

Examples of vectors

Answer 7

Any force, velocity, displacement, momentum, and acceloration

Question 8

what is scalar

Answer 8

a quantity that has magnitude but not a direction

Question 9

what is magnitude

Answer 9

size

Question 10

examples of scalars

Answer 10

mass,distance,speed

Question 11

what is velocity

Answer 11

the speed of an object in a particular direction.

Question 12

what is acceleration.

Answer 12

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

Question 13

acceleration ==

Answer 13

(delta)speed / time

Question 14

speed and velocity ==

Answer 14

dist/time

Question 15

what is displacement

Answer 15

distance in a straight line ( has a direction)

Question 16

WHat is newtons first law of motion?

Answer 16

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.

Question 17

WHat is weight?

Answer 17

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

Question 18

WHat are all forces mesured in?

Answer 18

Newtons

Question 19

What are vector quantities?

Answer 19

quantities that have both magnitude and direction

Question 20

What is magnitude?

Answer 20

Size

Question 21

What is Mass?

Answer 21

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

Question 22

What are scalar quantities?

Answer 22

quantities that have size but not direction

Question 23

What are examples of vectors ?

Answer 23

Forces, velocity, displacement, momentum and acceloration

Question 24

what are examples of scalars?

Answer 24

distance, speed,mass,energy

Question 25

What is displacement?

Answer 25

the distance covered in a straight line

Question 26

What is speed?

Answer 26

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

Question 27

What is the velocity/speed equation?

Answer 27

dist/time

Question 28

WHat is the acceleration equation?

Answer 28

delta speed/ time

Question 29

what is an independant variabke?

Answer 29

the thing you change

Question 30

What is the dependdent variable

Answer 30

the thing you mesure

Question 31

what is the control variable?

Answer 31

somethingyou keep the same

Question 32

what are quantities?

Answer 32

things we can mesure

Question 33

what is energy

Answer 33

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

Question 34

What are forms of energy called?

Answer 34

STores

Question 35

what are some types of energy

Answer 35

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

Question 36

what is efficiency?

Answer 36

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

Question 37

whats the equation for efficiency?

Answer 37

usefulenergy/totalenergy

Question 38

What do waves do?

Answer 38

they transfer energy/ information without transferring matter!

Question 39

WHat is the amplitude?

Answer 39

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

Question 40

What is wavlenth

Answer 40

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

Question 41

Transverse

Answer 41

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

Question 42

Longitudal

Answer 42

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

Question 43

Frequency in waves

Answer 43

how many waves pass every second [Hertz

Question 44

Speed in waves

Answer 44

how fast a wave travels [metres per second]

Question 45

Speed of a wave equation

Answer 45

v = f x λ

Question 46

What is ultra sound?

Answer 46

sound over 20khs (humans cant hear)

Question 47

WHat is darkness?

Answer 47

the absence of light

Question 48

Why do we have colors?

Answer 48

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

Question 49

Diffuse reflection

Answer 49

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

Question 50

Specular relection

Answer 50

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

Question 51

Diffusion

Answer 51

Spreading out of ( High concentration - Low)

Question 52

Visible spectrum

Answer 52

The range of colors/ light we can see

Question 53

How does color reflection work?

Answer 53

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.