Physics #1

Question 1

What is Convection

Answer 1

It is heat transfer.

Convection is a type of heat transfer. Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy.

Heat energy is transferred from hot places to cooler places by convection.

Question 2

From what temperature does energy move?

Answer 2

From hot to cold.

Question 3

What is conduction?

Answer 3

It is heat transfer.

Conduction is when a solids particles, which are tightly packed, constantly vibrate. As we heat the solid (eg. metal) the particles get more energy and vibrate even more. As the continue to vibrate rapidly, the bump into each other passing energy along therefore repeating the process. eventually the energy has transferred through the whole solid.

Question 4

What is an example of a gas (scientifically)

Answer 4

Oxygen
carbon dioxide
Nitrogen

Question 5

What is radiation

Answer 5

radiation is a form of heat transfer.

Heat can move by travelling in infra red waves. These are electromagnetic waves, like light waves, but with a longer wave length.
They can move through a vacuum.
They travel at 300,000,000 m/s (metres per second)
They can be reflected.

Question 6

Does black or white reflect heat energy?

Answer 6

White. Black absorbs light.

Question 7

Give examples of metals that are magnetic.

Answer 7

Iron,
Nickel,
cobalt,
Steel.

Question 8

Give examples of different energy’s.

Answer 8

Sound energy.
Kinetic energy.
heat energy.
Elastic energy.
light energy.
nuclear energy.
wind energy.
gravitational energy (anything at a height.
Solar energy.
Tidal energy.
Chemical energy
electric energy.

:)

Question 9

How do you calculate power? Formula?

Answer 9

power = Energy transformed (J/ joules)
_______________________
Time (seconds/ s)

Question 10

What is the deepest layer in the earth?

Answer 10

The inner core

• Made of liquefied iron and nickel with a temperature going up to 5500 degrees.

Question 11

What is the red and blue part of a magnet?

Answer 11

The red part means North Pole.

The blue means South Pole.

Question 12

Which parts of magnets attract?

Answer 12

Opposites attract.
With the same sides (e.g. North and north) there is an invisible force forcing them apart.
Different sides (e.g. North and south) are attracted to each other.

Question 13

How does that suns heat reach us?

Answer 13

In waves.

Question 14

How do infra red cameras work?

Answer 14

Infrared cameras give images even in the dark because they detect heat not visible light.