Physics P2

Question 1

What is thermal conduction ?

Answer 1

This is the process where energy is transferred by vibrating particles in a substance .

Question 2

The higher the thermal conductivity of a material, the higher the rate of enrgy transfer by conduction across the material . Is this true ?

Answer 2

Yes

Question 3

What is an insulator ?

Answer 3

An insulator is a substance that is a poor thermal conductor .

Question 4

What is one example of an insulator ?

Answer 4

Wool

Question 5

What are insulators used for ?

Answer 5

To reduce energy transfers .

Question 6

What are insulators used for to reduce energy transfer ? Give one example

Answer 6

To keep a house warm

Question 7

What does the energy transfer through a layer of insulating material depend on ? Give three examples

Answer 7

The temprature difference , the thickness and the thermal conductivity of a material. .

Question 8

What is specific heat capacity ?

Answer 8

This is how much energy it takes to raise a substance temprature .

Question 9

What is the equation for specific heat capacity ?

Answer 9

Specific ht capacity = amount of heat transferred
Divided by the mass x the change in temprature

Question 10

What are some examples of insulators in our homes ?

Answer 10

Carpets , curtains , doors

Question 11

What is loft insulation ?

Answer 11

A material installed in the attic or loft to reduce heat loss

Question 12

What is cavity wall insulation ?

Answer 12

This is the process of which a gap if filled between the walls of the house to keep the warmth inside .

Question 13

What is double glazing ?

Answer 13

Insulating windows

Question 14

What is a u value ?

Answer 14

The U value of an insulator represents the rate of heat transfer through a material .

Question 15

What is the equipment used in a practical to measure specific heat capacity ?

Answer 15

Aluminium , container , mat , thermometer , heater , timer , foam , water , pipet , voltmeter , ammeter and power supply .

Question 16

What are the steps in the specific heat capacity ?

Answer 16

1. Check the mass of the aluminium block .
2. Wrap the insulation securely around the block and place it on a mat .
3. Fill the container with water record the initial temprature of the water using a thermometer
4. Heat the metal block using the heater and every one minute check the tenprature on your timer
5. Record your results
6. Switch the power of after the experiment and leave the block to cool down .