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Flashcards in rest of science Deck (49):
1

how long does it take for the moon to orbit the earth

27 days and seven hrs

2

what are the different types of moon

whaxing and whaning

3

what are the stages in the cycle of the moon

new, whaxing cresant first quarter whaxing gibbous full whaning gibbous third quarter whaning cresent new...

4

what is lit up all of the time

one of the 2 halves of the moon is always light, and the other is always dark

5

what is a luner moon

the time between 1 new moon and the next

6

what is a solar eclipse

when the moon comes between the sun and the earth

7

what is a lunar eclipse

when the earth comes between the moon and the sun

8

why do we only ever see one side of the moon

because the time that the moon takes to spin on its axis is the same as the time it takes to spin around the earth

9

What does a source of light do?

It emits light

10

Give an example of a source of light

A lightbulb

11

What is something that gives out light called

Luminous

12

What do you call something that doesn't give out light

Non-luminous

13

How do you see things?

They are reflected from light into your eyes

14

What does transparent mean?

You can see through it

15

What does translucent mean?

You can see through it, but not very clear

16

What does opaque mean?

A material which you can't see anything through

17

What do opaque materials produce

Shadows

18

What can light travel through?

Most gases, some liquids and some solids

19

What is a vacuum?

An empty space

20

How fast does light travel

It travels at 300,000 km/s

21

How long does it take for light to travel from the sun to the earth

8.3 minutes

22

What is a light year

How far light travels in a year

23

What do you see in a mirror

An image

24

What is an incident Ray?

The ray that hits the mirror from the Ray box

25

What is the Ray that reflects off the mirror called

Reflected Ray

26

What is the imaginary line at 90 degrees to the mirror called

The normal

27

What is the law of reflection

The angle of incidence is equal to the angle of reflection

28

What is specular reflection

Reflection from a smooth surface

29

What is diffuse scattering

Reflection from a rough surface

30

State the type of reflection when light hits a mirror

Specular reflection

31

What is refraction

When the direction light is travelling changes

32

When does refraction happen?

Whenever light travels from one medium to another

33

What is the difference between reflection and refraction?

Reflection is where light is changing in straight lines. Refraction is where light changes the direction it is travelling in

34

What does a lens do?

It focuses the light and enables you to see

35

What are the lenses in your eyes called

Convex or converging

36

What is the focus point?

Where the Rays cross

37

What are drag forces

Water resistance and air resistance

38

How can you reduce drag forces

Being more streamlined

39

List some fuels

Petrol, diesel, hydrogen

40

What happens when fuels burn

A chemical reaction takes place, this is called combustion

41

What are fossil fuels

Made from underground or sea, they are non-renewable, They will run out one day

42

Name two reactants when hydrogen burns in air

Water and oxygen

43

What are oxidation reactions

When substances react with oxygen

44

What is an example of an oxidation reaction

Iron rusting

45

What is a chemical reaction

Where atoms are rearranged to create new substances

46

Are chemical reactions reversible

No

47

Why are chemical reactions useful?

They are used to make medicine

48

What do chemical reactions also do?

Transfer energy

49

Are all chemical reactions fast?

No, some are quick some are slow. Chemists use catalysts to speed up reactions