VVS-branchens Uddannelsesnaevn - Højnaesvej 71 - DK, 2610 Roedovre - tel.: Web: -

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1 VVS-branchens Uddannelsesnaevn - Højnaesvej 71 - DK, 2610 Roedovre - tel.: Web: folkeskole@vvsu.dk Authers: Erland Andersen and Finn Horn

2 Case no. 1 Thermometer Rubber bung Thermometer Glass tube Equipment needed: 1 glass tube, 1 rubber bung with a small hole in it, 1 test tube. Completely fill up a test tube with water. Put a glass tube inside the hole in the rubber bung. Plug the test tube with the rubber bung. On the glass tube, mark the water level at the beginning. Hold both hands tightly around the test tube for 5 minutes. Be careful not to touch the rubber bung. What has happened to the water level in the glass tube? Colour the drawings below: Before After T h e s m a l l e n e r g y d r i v i n g l i c e n s e 1

3 Case no. 2 A hunt for the warmest and the coldest places in the classroom Locate the warmest place in the classroom. Where is it? What is the temperature? Locate the coldest place in the classroom. Where is it? What is the temperature? The coldest place The warmest place Your result The result of the class T h e s m a l l e n e r g y d r i v i n g l i c e n s e 2

4 Case no. 3 Cut a hot-air mobile On a piece of paper draw a line around the rim of a small saucer. Cut a 2 cm. thick spiral inside the drawn circle to make the circle look like a screw (see the enclosed model). Fold the centre of the spiral 4 times to make a point in the paper. Place a pencil in a small piece of clay, plasticine or a ½ potato. Hang the spiral on the point of the pencil. Place the arrangement above a source of warm air. What happens? Equipment needed: 1 pair of scissors, 1 piece of paper, 1 small saucer, 1 pen/pencil and the enclosed model for case no. 3 See angel mobiles and other mobiles on: T h e s m a l l e n e r g y d r i v i n g l i c e n s e 3

5 Model for case no. 3 T h e s m a l l e n e r g y d r i v i n g l i c e n s e 4

6 Case no. 4 Light contains energy Fill 2 plastic bags with 100 grams of water. Seal the bags to prevent the water from running out. Use tape to attach one plastic bag to a white piece of paper and another to a black piece of paper. Leave both bags with the paper hanging in the same position in direct sunlight (or under a hot lamp) for 15 minutes. If a lamp is used, the distance from the lamp to the bags should be approximately 50 cm. 100 g of water = 100 ml of water = 1 dl of water. Measure the water temperature in both bags. What is the temperature in the bag with the white background? What is the temperature in the bag with the black background? White background Black background Your result The result of the class T h e s m a l l e n e r g y d r i v i n g l i c e n s e 5

7 Case no. 5 Heat can move Put different materials on a table: For instance 1 piece of cloth, 1 piece of wood, 1 piece of expanded polystyrene, 1 piece of metal (a box), and 1 glass plate. Leave all materials untouched on the table for a couple of minutes. Put one hand on one material and the other hand on another material. Count to ten. Which material is cold and which is warm? Materials Cold Warm 1. Wood 2. Metal T h e s m a l l e n e r g y d r i v i n g l i c e n s e 6

8 When you have compared two different items a couple of times, you will be able to group the materials in two groups. Materials which feel cold: Materials which feel warm: The coldest material The warmest material Your result The result of the class Fill in the boxes with your choice of materials and colour the cold materials blue and the warm materials red: Cloth Wood Glass Metal T h e s m a l l e n e r g y d r i v i n g l i c e n s e 7

9 Case no. 6 When ice melts An ice cube put on a saucer in the classroom will melt to water. Place an ice cube in a plastic bag and seal the bag completely! Can you make an ice cube melt quickly? How many minutes did it take? minutes. Can you make an ice cube melt slowly? How many minutes did it take? minutes. Your result The result of the class Slowest Quickest Draw below what you did: T h e s m a l l e n e r g y d r i v i n g l i c e n s e 8

10 Case no. 7A Evaporation, part 1 Dip one finger briefly in a glass of water. How does your finger feel after having been dipped in water? What happens afterwards? The finger feels warm: The finger feels cold: T h e s m a l l e n e r g y d r i v i n g l i c e n s e 9

11 Case no. 7B Evaporation, part 2 Put a small piece of wet cloth in a plastic bag. Leave the bag on a warm radiator or in direct sunlight for 1 hour. Take the cloth out of the plastic bag. Is it dry? Yes: No: Did something happen inside the plastic bag? T h e s m a l l e n e r g y d r i v i n g l i c e n s e 1 0