Energy

Question 1

How much energy does an Apple have?

Answer 1

150 KJ ***??

Question 2

How much energy in 10 potato crisps?

Answer 2

2225 KJ

Question 3

What are Macronutrients?

Answer 3

nutrients required in large amounts

• carbohydrates
• fats
• proteins

Question 4

What are Micronutrients?

Answer 4

nutrients only required in small amounts

• minerals
• vitamins

Question 5

What does fibre do?

Answer 5

Cleans intestines

**check

Question 6

What does water do?

Answer 6

Keeps the body hydrated

Question 7

What do carbohydrates do?

Answer 7

provide an energy source that is quickly converted

Question 8

What are fats?

Answer 8

a concentrated energy source stored by the body for long term energy supplies and warmth

Question 9

What do proteins do?

Answer 9

builds, repairs and renews body tissues

Question 10

What do minerals do?

Answer 10

provide essential simple chemicals

Question 11

What do vitamins do?

Answer 11

carry out specific bodily processes

Question 12

What happens when the energy in (consumed) is less than the energy out (used)?

Answer 12

• tiredness
• stunted growth
• weight loss
• bone fragility
• susceptible to illness

Question 13

What happens when the energy in (consumed) is equal to the energy out (used)?

Answer 13

• balanced diet
• sensible exercise
• healthy!

Question 14

What happens when the energy in (consumed) is greater than the energy out (used)?

Answer 14

• tiredness (extra weight)
• heart problems
• obesity

Question 15

Why do we need food?

Answer 15

We use the energy obtained from food to fuel our bodies for growth, repair and movement. How much energy we need is determined by our gender, age and activity level.

Question 16

Define conduction

Answer 16

Conduction occurs when particles collide with each other and transfer heat energy.

Question 17

Define convection

Answer 17

Convection is the movement of particles from an area of higher temperature to an area of lower temperature. As particles gain energy, they become less dense and rise.

Question 18

Define radiation

Answer 18

Transfer by radiation involves energy travelling as waves from one place to another without using matter

Question 19

Insulator

Answer 19

a substance that prevents or slows the transfer of heat energy

Question 20

Active energy

Answer 20

Energy in motion

Question 21

Potential energy

Answer 21

stored energy that is not in motion

Question 22

What is a fossil fuel

Answer 22

a source of energy where there is a finite supply, e.g coal.

Question 23

What is a renewable energy source

Answer 23

an energy source that replaces itself faster than it gets used up