Good Science Victorian Curriculum Year 7

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INVESTIGATIONS Investigation 8.2 Blowball KEY SKILL IDENTIFYING AND MANAGING RELEVANT RISKS Brainstorm with a partner to identify three possible hazards or risks that may be involved in this investigation. Suggest one way that each hazard or risk could be reduced. AIM To investigate the effects of unbalanced forces on a ping-pong ball MATERIALS • table • ping-pong ball • 4 drinking straws METHOD 1 Gather into groups of four. Each member of the group takes one straw and kneels at a different side of the table. 2 Place the ping-pong ball in the centre of the table. 3 Take turns to blow through your straws to move the ball around the table. 4 Have one group member blow the ball across the table while the others blow on it in the other direction. 5 Have one group member blow the ball across the table while the others blow on it from the sides. 30 min 6 Divide into two pairs, with each pair on a different side of the table. As a pair, try to blow the ball across the table and off the side while the other pair does the same. 7 Record observations in your book. In particular, detail how different sized forces were able to affect the motion of the ball. QUESTIONS 1 At what times were the forces on the ball balanced? 2 Describe what happened to the speed and direction of the ball when you blew on it as it moved towards you. 3 What happened when you blew on the ball as it moved at a right angle to you? 4 Draw a force diagram showing the forces that were acting on the ball as you blew it away from you. CONCLUSION Copy and complete: ‘The results show that: (respond to the aim)’. Level 1 176 GOOD SCIENCE VICTORIAN CURRICULUM 7
INVESTIGATIONS Investigation 8.4 Heat from friction KEY SKILL IDENTIFYING THE VARIABLES AND FORMULATING A HYPOTHESIS Before you formulate a hypothesis, identify your independent, dependent and controlled variables. The independent variable is the one thing that you purposefully want to change in an investigation. The dependent variable is what you will be measuring. The controlled variables are all the things you need to keep the same throughout the investigation. To formulate your hypothesis use the following sentence stem: It can be hypothesised that if (something to do with your independent variable), then (something to do with your dependent variable). Hint #1: If you get stuck, use the prompts in Lesson 1.4 to help you. AIM To investigate the connection between friction and heat 20 min METHOD 1 Pick up each item to see how warm or cool it is. 2 Firmly rub the plastic rod 20–30 times with the cloth. Carefully feel it and record how its temperature has changed. 3 Repeat step 2 with each of the other items. 4 Record any other observations you make. QUESTIONS 1 Which item had the greatest change in temperature? 2 Which item had the least change in temperature? 3 Explain how friction caused the change in temperature. CONCLUSION Copy and complete: ‘The results show that: (respond to the aim)’. Level 1 MATERIALS • microfibre cloth • wire coathanger • wooden skewer • plastic rod • cardboard roll 177
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GOOD SCIENCE VICTORIAN CURRICULUM Y
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MAKE EVERY LESSON A GOOD LESSON
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Chapter 5 Mixtures . . . . . . . .
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VICTORIAN CURRICULUM SCIENCE LEVELS
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Good Science Victorian Curriculum Year 7

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