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Year 8 Science > 8L - Earth and Space > Flashcards

8L - Earth and Space Flashcards

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1
Q

What do we use to gather evidence about other planets now?

A

We use spacecrafts and very powerful telescopes.

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2
Q

What did early astronomers use to gather evidence about other planets now?

A

They used theirs eyes.

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3
Q

Which planet did early astronomers see?

A

Mercury
Venus
Mars
Jupiter
Saturn

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4
Q

What did Ptolemy’s model look like?

A

Earth was at the centre. The moon, sun and other planets orbited Earth.

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5
Q

What did later astronomers discover?

A

They made more accurate observations on the movements of the planets.

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6
Q

What did Nicolas Copernicus do?

A

He published a book that suggests that Earth and Other planets circuit around the sun.

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7
Q

Why was Nicolas Copernicus’[s model eventually accepted?

A

It was supported by Galileo’s discovery from one of the first telescopes.

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8
Q

Who invented todays model of the Solar System?

A

Johannes Kepler

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9
Q

What does Johannes Kepler’s model look like?

A

The sun is at the centre and then the planets orbit the sun which is orbited by the moons.

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10
Q

What is the Luna 2?

A

It was the first probe to reach the moon. It crashed into the the moon in 1959.

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11
Q

What is the difference between pater probs and the Luna 2?

A

They made soft landings. They brought back moon rocks.

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12
Q

What causes the seasons in Europe?

A

The Earth being tilted on its axis

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13
Q

What causes Summer?

A

It is summer when the Earths axis is pointed towards the Sun.

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14
Q

What causes Winter?

A

When the Earth’s axis is pointed away from the sun.

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15
Q

How do ships work out where they are?

A

They use satellites.

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16
Q

When were magnets discovered?

A

600 BCE

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17
Q

What was discovered to be a magnet?

A

A piece of rock containing iron would point north if hung from a thread.

18
Q

What is a compass?

A

Something that point from north to south.

19
Q

What is a North Seeking Pole?

A

The end that point north.

20
Q

What is a South Seeking Pole?

A

Then end that points south

21
Q

What does NSP stand for?

A

North Seeking Pole

22
Q

What does SSP stand for?

A

South Seeking Pole

23
Q

Which side does the North repel?

A

North

24
Q

Which side does the South repel?

A

South

25
Q

Which side does the North attract?

A

South

26
Q

Which side does the South attract?

A

North

27
Q

What is a magnetic field?

A

The space around a magnet.

28
Q

What is a field in science?

A

A space in which a particular force has an effect.

29
Q

Where is the field strongest?

A

When the lines are close together.

30
Q

Where is the field weekest?

A

When the lines are further apart.

31
Q

Does the magnetic field have a direct?

A

Yes

32
Q

What is Gravity?

A

The force that pulls two objects that are near each other together. The bigger the mass of the object the stronger the force it exerts.

33
Q

What does Earth have that you need for gravity?

A

Large mass
Large force

34
Q

What is weight?

A

The force of gravity pulling on you.
It is measured in Newtons.

35
Q

What is a gravitational field?

A

The space around Earth where i’s gravity attracts things.

36
Q

What is the gravitational field strength at Earth’s surface?

A

10 Newtons per kilogram

37
Q

What is the formula for weight?

A

Weight = Mass x Gravitational Field Strength
(N) = (kg) x (N/Kg)

38
Q

How fast does the Earth move around the sun?

A

Around 100 000km/h

39
Q

What keeps the Earth in it’s orbit?

A

The force of gravity between the Earth and Sun.

40
Q

Where is the force of gravity weekest?

A

When two attracting object are further apart.

41
Q

What is a Moon?

A

A Natural Satellite of the Earth.

42
Q

What is an Artificial Satellite?

A

Can be put in orbit around the Earth, Other planets or moons. Used to photograph Earth and transmit Tv programmes.

Year 8 Science (7 decks)

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