CP Ch05.8 Efficiency

Why do even simple machines like levers and pulley systems have efficiency levels below 100%?

• Due to energy being wasted as heat

• Due to lack of proper maintenance

• Due to incorrect usage

• Due to excessive lubrication

How does the amount of energy wasted as heat relate to the efficiency of a machine?

• Increases as efficiency increases

• Decreases as efficiency decreases

• Remains constant regardless of efficiency

• Is not affected by the efficiency

Why do energy transitions in machines often result in the loss of usable energy?

• To increase efficiency

• To reduce energy consumption

• Due to friction and heat generation

• To store energy for later use

What are some forms of energy wastage in gasoline?

• Hot exhaust gases

• Unburned fuel

• Cooling system

• Transmission system

What is the main limitation preventing machines from achieving 100% efficiency?

• Friction

• Gravity

• Inertia

• Magnetism

How is efficiency in machines expressed?

• By the ratio of work done to energy used

• By the speed of operation

• By the size of the machine

• By the color of the machine

What are some factors contributing to energy wastage in traditional automobile engines?

• Friction

• Fuel usage

• Lubrication

• Temperature