➽ Energy - Food and Fuels

Question 1

What is energy measured in?

Answer 1

Joules (J) or Kilojoules (kJ)

Question 2

How many Joules are there in one Kilojoule?

Answer 2

1000J

Question 3

How does the amount of energy in different foods compare?

Answer 3

Different foods contain different amounts of energy.

Question 4

If the body requires energy to function, can we just eat any foods?

Answer 4

No, both the nutritional value as well as energy content of food should be taken into account.

Question 5

What are fuels?

Answer 5

Things that release energy when burned.

Question 6

Give me 3 examples of fuels.

Answer 6

1. Coal
2. Oil
3. Wood

Question 7

How are fuels and food similar?

Answer 7

1. They both store energy
2. Fuels release energy when burned, and foods release energy when digested.

Question 8

Approximately how much energy does sleep require per hour?

Answer 8

300 kJ/hour

Question 9

Approximately how much energy does working require per hour?

Answer 9

600 kJ/hour

Question 10

Approximately how much energy does playing require per hour?

Answer 10

3600 kJ/hour

Question 11

Which types of activities require more energy and why?

Answer 11

Physical activities require more energy than regular tasks as the body has far more processes to carry out, e.g. more breathing, sweating, etc.

Question 12

What types of people require more energy?

Answer 12

1. Athletes - they do a lot of physical activity
2. Growing children - lots of energy is used up for bone and muscle growth.

Question 13

What happens to extra energy in the body?

Answer 13

It is converted into fat.