1Copy and Complete These Sentences by Choosing from the Wordsin Bold

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1Copy and complete these sentences by choosing from the wordsin bold.

Energy is measured in grams/joules. These are verysmall/large units so we usually use kilojoules/kilometres.

Food contains energy stored as strain/chemical energy.

2The table shows the energy values of some foods.

Food / Energy in kilojoules per 100 grams
grilled bacon / 1350
Bakewell tart / 3350
breakfast cereal / 1700
curry and rice / 6700
cheeseburger and chips / 9800

aStick down the bar chart of foods and their energy values. Drawbars to complete the chart.

bWhich food provides the most energy?

cWhere did the energy in the rice originally come from?

CORE

3Explain the following true statements.

aJo who works on a building site needs to eat more than hertwin sister Jem who works in an office all day.

bWe need energy from food, even when we are asleep.

cA fried egg provides more energy than a boiled egg of exactlythe same size.

dWalking for one kilometre uphill uses more energy than walkingfor one kilometre along a flat road.

© Harcourt Education Ltd 2003 Catalyst 1

This worksheet may have been altered from the original on the CD-ROM.

4Read this information.

aFor how long could you walk uphill using only the energy from the meal?

biFor roughly how many hours could you play a computer game using only the energy from the meal?

iiWhy would it be a very bad idea to play a computer game for this amount of time? (Hint: this has nothing to do with energy!)

EXTENSION

5Jon was a keen mountaineer and he climbed Mont Blanc last summer. Before he set off he had an enormous meal. He also carried food and drink with him. It took him 14hours to reach the summit and return to the valley. The temperature at the summit was –5 °C but in the valley it was 20 °C.

aWhich type of energy is involved in each of the following?

iJon’s food

iiJon travelling uphill

iiiJon keeping warm

ivJon sitting at the summit, ready to descend

bWhy did Jon need to take food with him, given that he had eaten an enormous breakfast?

cDraw a flow chart (an energy transfer diagram, really) to show how energy from the Sun helped to get Jon to the top of Mont Blanc and back, keeping him warm at the same time.

© Harcourt Education Ltd 2003 Catalyst 1

This worksheet may have been altered from the original on the CD-ROM.

HELP

Bar chart of foods and their energy values

HELP

Bar chart of foods and their energy values

© Harcourt Education Ltd 2003 Catalyst 1

This worksheet may have been altered from the original on the CD-ROM.