AQA 1. Energy

When a ball rolls down a hill, the main energy transfer is:

• Kinetic to GPE

• GPE to acoustic

• Kinetic to thermal

• GPE to kinetic

An electric radio's intended energy transfer is:

• Electric to thermal

• Electric to acoustic

• Nuclear to thermal

• Electric to kinetic

A petrol car's main intended energy transfer is;

• Chemical to kinetic

• Nuclear to chemical

• Elastic potential to GPE

• Chemical to thermal

The formula for kinetic energy and for GPE are:

The GPE gained by a mass of 2kg being lifted by 2m is approximately

• 4J

• 40J

• 400J

• 40W

Power is:

• Measured in Watts

• All of these

The average power generated by a motor which does 100J of work in 20 seconds is:

• 5W

• 2000W

• 80W

Which of these are ways of reducing energy waste?

• Lubricating a mechanism to reduce friction

• Making a vehicle aerodynamic to reduce drag

• Insulating a home to reduce heat loss

• Painting buildings white to absorb sunlight

Efficiency can be defined in terms of either energy or power. Which is the correct definition using power?

(If you replaced the word Power with Energy the answer would be the same box)

• Total input power / Total output power

• Useful output power / Total input power

• Total input power / Useful output power

Which of these is/are RENEWABLE energy sources?

• Biofuel

• Tidal

• Geothermal

• Nuclear

• Coal