thermal energy

Question 1

Thermal energy

Answer 1

energy possessed by a system due to its temperature

Question 2

temperature

Answer 2

the measurement of the average kinetic energy of the particles in a system

Question 3

Brass or steel cools faster?

Answer 3

Brass

Question 4

Conduction

Answer 4

transfer of thermal energy through a medium without the physical movement of the medium itself.

Question 5

how does conduction work?

Answer 5

When one part of the object is heated, particles at the heated end begin to move more vigorously.

They then collide with the particles beside them to transfer energy and make them move faster.

This process continues until the energy is passed down to the cooler end of the object and all the particles move faster and more vigorously.

Question 6

Why do metal conduct thermal energy better than most non-metals?

Answer 6

Metals have free electrons to help transfer energy quickly.

Question 7

Convection

Answer 7

transfer of thermal energy due to the movement of the medium, arising from density differences in the medium.

Question 8

how convection works? heating

Answer 8

When the liquid/gas is heated at the bottom, it expands to become less dense and rises to the top.

Cooler liquid/gas at the top is denser so it sinks to replaces it.

This process continues to set up a convection current to heat up all the liquid/gas

Question 9

how does convection work? Cooling ver

Answer 9

When the liquid/gas is cooled at the top, it contracts to become denser and sinks to the bottom.

Warmer liquid/gas at the bottom is less dense so it rises up to be cooled.

This process continues to set up a convection current to cool down all the liquid/gas

Question 10

Radiation

Answer 10

transfer of thermal energy in the form of infrared radiation without the need of a medium.

Question 11

What affects radiation?

Answer 11

1. nature of the surface
2. surface area of the object
3. Surface temperature pf the object.