Year 8 Physics Flashcards

1
Q

What is the Geocentric model?

A

This means the Earth is at the centre of the Solar System and everything revolves around it.

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2
Q

What is the Heliocentric model?

A

This means the Sun is at the centre of the Solar System and everything revolves around it.

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3
Q

What disproved the Geocentric model?

A

Mars in retrograde discovered by Copernicus

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4
Q

What shape did Kepler prove that the planets moved in?

A

elliptical shape (oval)

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5
Q

What piece of equipment did Galileo use to get evidence about the Heliocentric Solar System?

A

Telescope

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6
Q

What happened to Galileo when he spoke about the Heliocentric Solar Sytem?

A

He was imprisoned for the rest of his life

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7
Q

What is the order of the planets starting with the closest to the Sun?

A

Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune

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8
Q

What is the Sun?

A

The Sun is a star which is a large ball of hot gas. We see stars because we see the light they produce.

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9
Q

What is a planet?

A

A planet is a large ball of rock or gas that orbits a star. They do not produce light. We can only see them in the sky because they reflect the Sun’s light

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10
Q

What is an asteroid?

A

Asteroids are rocky or metallic objects of different shapes and sizes. They orbit the Sun and are found mostly within the asteroid belt between the orbits of Mars and Jupiter.

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11
Q

What is a comet?

A

Comets are lumps of ice and dust. They are of different shapes and sizes and they also orbit the Sun. When they come close to the Sun, the ice melts and evaporates and they develop a distinctive tail of gas and dust which streaks out behind it and is lit up by the Sun.

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12
Q

What orbits a planet?

A

A satellite (e.g. the moon) . They are held in place by gravity.

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13
Q

Give an example of a natural satellite

A

The Moon

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14
Q

Give 3 uses of artificial satellites

A

o Relaying television signals
o Communicating
o Astronomy (Photographing space)
o Photographing Earth
o Navigation
o Monitoring Earth’s weather
o Monitoring Earth’s atmosphere
o Search and Rescue
o Spying and security

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15
Q

What piece of equipment would you use to measure TIME? What units would you use to measure it?

A

Stop clock
Seconds (s)

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16
Q

What piece of equipment would you use to measure LENGTH? What units would you use to measure it?

A

Ruler
E.g. Centimeters (cm)

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17
Q

What piece of equipment would you use to measure TEMPERATURE? What units would you use to measure it?

A

Thermometer
Degrees Celsius (oC)

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18
Q

What piece of equipment would you use to measure MASS? What units would you use to measure it?

A

Balance / scales
grams (g)

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19
Q

What piece of equipment would you use to measure VOLUME OF LIQUID? What units would you use to measure it?

A

Measuring cylinder
mililitres (ml)

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20
Q

How many cm are there in 1m?

A

100cm

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21
Q

How many ml are there in 1L?

22
Q

How many mm are there in 1cm?

23
Q

How many g are there in 1kg?

24
Q

How do you calculate the Area of a rectangle?

A

Area = Length × Breadth

25
How do you calculate the volume of a cuboid?
Volume = Length × Breadth × Height
26
What is the area of a rectangle that has a length of 2.6cm and a breath of 3.9cm? You must include units
10.14cm2
27
What is the volume of a cuboid that has a width of 2cm a breadth of 5 cm and a height of 4 cm? You must include units
40cm2
28
How do you measure the volume of an irregular shape?
It is possible to measure the volume of an irregular shaped object by placing it in water. The volume can be calculated by measuring the difference of volume of water in the container.
29
The mass of a cup is about 200___?
grams
30
A bottle of water contains about 500___?
ml
31
A school bag weights about 5___?
kg
32
A swimming pool can hold 60,000___?
litres
33
The thickness of a penny is about 1.5___?
mm
34
Miss Spiers is 1.68m in height. What is her height in mm?
168cm x 10 = 1680 mm
35
The door is 2.2m high. What is this in mm?
220cm = 2200mm
36
What is 1000g in kg?
1kg
37
Convert 3945g into kg
3.945kg
38
Covert 2501g into kg
2.501g
39
Which objects (stars, sun, asteroids, comets, moon and planets) in space do not produce their own light but can be seen?
asteroids, comets, moon and planets
40
Which of the following is a star? (stars, sun, asteroids, comets, moon and planets)
Sun
41
Which of the following has a tail? (stars, sun, asteroids, comets, moon and planets)
Comet
42
Which of the following orbits planets?(stars, sun, asteroids, comets, moon and planets)
Moon
43
How do you make a practical reliable?
Repeat and calculate an average
44
What is the independent variable?
The thing you change (goes on the x axis)
45
What is the dependent variable?
The thing you measure (goes on the y axis)
46
How do you make an experiment fair?
Only change one thing at a time
47
Why do you need controlled variables?
To make it a fair test
48
In the wingspan experiment, what was the independent variable?
The wingspan
49
In the wingspan experiment, what was the dependent variable?
The time take to drop/fall to the ground
50
In the wingspan experiment, give 2 control variables
Height of the drop, same material of propeller, same mass of propeller
51
What is an anamoly?
A results that doesn't fit the pattern