lesson three

Question 1

explain conduction?

Answer 1

particles are vibrating around a fixed point. when they heat, they vibrate faster. they transfer energy to their neighbours as they are connected by forces/bonds

Question 2

why to molecules vibrate more when heated?

Answer 2

hotter objects have faster moving particles.

Question 3

why do molecules pass their vibrations from one to another?

Answer 3

particles are connected by forces. if one vibrates more it will drag its neighbours with it

Question 4

why are most of the best conductors metals?

Answer 4

same as conducting electricity, metals have free electrons which when heated will spread down the metal, carrying their energy

Question 5

how to increase heat transfer by conduction

Answer 5

1. use a better conducting substance
2. increase the area of the substance

Question 6

how to decrease heat transfer by conduction

Answer 6

1. better insulating substance
2. decrease surface area

Question 7

heat transfer flow chart

Answer 7

1. direction of heat flow(HOT TO COLD)
2. do you want the heat to flow this way
3. how is/can insulation be improved in this scenario
4. link back to scenario - how does this achieve the desired outcome?

Question 8

heat transfer
hot weather

Answer 8

• in the warm weather, heat will flow from the _____ to the air but not very fast bc high temperature
• _______ would want to increase heat flow to decrease body/room/etc temperature
• ______ has evolved ________ with high surface area to act as a better conductor of heat
  -this means that ______ can cool down more effectively in a hot environment

Question 9

heat transfer
cold weather

Answer 9

• in the cold weather, heat will flow from the warmer _____ to the cooler surroundings
• ____ would want to prevent this
• ______traps a layer of air
• bc air is a good insulator this decreases heat loss
• this means that ______ can stay warm in a cold environment