Topic 3 - Conservation Of Energy - Mechancial Waste Energy And Waste Energy

Question 1

What is mechanical waste energy?

Answer 1

Energy dissipated in mechanical processes due to temperature rise

Mechanical waste energy occurs when energy transferred to an object results in heat being lost to the surroundings.

Question 2

What happens to energy in mechanical processes?

Answer 2

It can cause a rise in temperature

This rise in temperature indicates energy dissipation.

Question 3

What happens to heat in mechanical processes?

Answer 3

Heat is transferred to the air

This transfer contributes to energy loss during mechanical operations.

Question 4

Why are mechanical processes considered wasteful?

Answer 4

Energy is dissipated to the surroundings

The dissipation of energy as heat results in inefficiency.

Question 5

Fill in the blank: In mechanical processes, energy transferred can cause a _______.

Answer 5

rise in temperature

Question 6

True or False: Mechanical waste energy is beneficial for energy efficiency.

Answer 6

False

Mechanical waste energy represents a loss of useful energy.

Question 7

What are the common forms of waste energy?

Answer 7

Light, sound, heat

Question 8

What are two methods to reduce waste energy?

Answer 8

• Lubricate systems to reduce friction and heat
• Use thermal insulation to minimize heat loss

Question 9

How do thicker walls contribute to energy efficiency in buildings?

Answer 9

Thicker walls provide greater thermal insulation, reducing heat loss

Question 10

What is a significant issue caused by air cavities between walls?

Answer 10

Heat loss by convection

Question 11

What solution is used to prevent heat loss from air cavities in walls?

Answer 11

Cavity wall insulation fills in the gap and prevents airflow