HW 5.2: Reducing Energy Loss

What is the primary reason for sealing a house tightly?

• To increase air circulation

• To prevent heat loss by convection

• To enhance sound insulation

• To reduce heat loss in summer

Tags

NGSS.HS-PS3-4

Why are foam seals used around doors and windows?

• To block noise

• To enhance decoration

• To reduce heat loss by convection

• To increase air ventilation

Tags

NGSS.MS-PS3-3

What material property is desirable for reducing heat loss by conduction in walls?

• High density

• High thermal conductivity

• Low thermal conductivity

• High permeability

What is the purpose of a cavity wall?

• To improve structural strength

• To create an air gap that reduces conduction

• To allow air circulation in walls

• To enhance soundproofing

Tags

NGSS.HS-PS3-4

Why is insulating foam used in cavity walls?

• To fill air gaps and stop both conduction and convection

• To strengthen the walls structurally

• To increase air circulation in the cavity

• To reflect heat back into the house

Tags

NGSS.HS-PS3-4

How does double glazing reduce heat loss compared to single glazing?

• It allows more sunlight to enter

• It eliminates air gaps completely

• It has two layers of glass with an air gap to reduce conduction

• It prevents convection within the glass itself

What is the main issue with friction in energy transfer?

• It increases the speed of objects

• It reduces efficiency and generates unwanted heat

• It improves energy transfer

• It reduces heat loss in objects

How does oil act as a lubricant in mechanical systems?

• By increasing friction between moving parts

• By preventing wear on parts

• By reducing friction and making movement easier

• By adding weight to the system

What effect does streamlining have on vehicles?

• It increases air resistance

• It reduces air resistance and improves efficiency

• It makes vehicles heavier

• It reduces the need for insulation

Tags

NGSS.MS-ETS1-1

How do curtains help reduce heat loss in a house?

• By blocking noise from outside

• By trapping the colder air near the window and preventing more convection currents

• By improving airflow

• By reflecting heat into the room

Tags

NGSS.HS-PS3-4