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Experiments in Science at Primary School. Experiments with air. DANA MANDÍKOVÁ, JITKA HOUFKOVÁ, ZDENĚK DROZD Department of Physics Education, Faculty of Mathematics and Physics , Charles University in Prague. Experiments in Science at Primary School.
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Experiments in Scienceat Primary School Experiments with air DANA MANDÍKOVÁ, JITKA HOUFKOVÁ, ZDENĚK DROZD Department of Physics Education, Faculty of Mathematics and Physics, Charles University in Prague Košice 2013
Experiments in Scienceat Primary School Seminar designed for future primary school teachers, students of Pedagogical faculty, with goal: • to gain the interest of pre-service primary school teachers and motivate them to future studies • to familiarize them with experiments from the parts of natural science that are taught at primary school • to give them an opportunity to try those experiments themselves • to correct their misconceptions Košice 2013
Experiments in Scienceat Primary School The emphasis is put on: • hands-on activities • self-production of simple teaching aids and toys • correct explanations of shown phenomena • ways how to present them to young pupils • the most common misconceptions are mentioned and discussed, too Košice 2013
Experiments with air Examples of problems solved during the seminar Air is all around us, but we cannot see it nor smell it. Suggest an experiment by which the existence of air can be demonstrated. Pour air from one glass to another under the water level. Is it possible to dip a piece of paper into water such a way to it remains dry? Košice 2013
Experiments with air • Who poured water from a bottle most quickly? • Tornado. • Does the air have any weight? Estimate, how much does weigh the air in this room. • Weighing of air. Košice 2013
Weighing air Whatweneed: • Plasticbottlewithvalve; weight (accuracy 0.1 g)or rocker arm; pump; plastic hose; bucketwith water • 2 l ~ 2.5 g Košice 2013
Measuring air pressure • magic glass Košice 2013
Torricelli’s experiment with water Košice 2013
Torricelli’s experiment with water Košice 2013
Torricelli’s experiment with water Košice 2013
Torricelli’s experiment with water h = 10 m pA = hrg pA = 10·1000·10 Pa pA = 105 Pa Košice 2013
Lifting the air • pA = 105 Pa = 105 N/m2 = 10 N/cm2 Košice 2013
Collapse of a can Košice 2013
Collapse of a can Košice 2013
Magdeburg hemispheres • How big is the force with which are the hemispheres pressed together? Košice 2013
The egg in the bottle • Typical misconception – the oxygen burns out, in the bottle is less gas and underpressure pulls the egg into the bottle Košice 2013
Drowned candle Košice 2013
Balloon in a bottle • How to inflate the balloon inside the bottle? Košice 2013
When air is missing Košice 2013
When air is missing Košice 2013
When air is missing Košice 2013
When air is missing Košice 2013
Airflow • Blow between two papers or above a paper Košice 2013
Airflow • Spray from straws Košice 2013
Some more experiments • A flying tea bag Košice 2013
Falling cones Košice 2013
Magnus effect v1> v2 p1< p2 !!! flow of real gas must be taken into account Košice 2013
Some more experiments • Inflating the long plastic “sleeve” • Inflating the long plastic “sleeve” • Try to blow the small paper ball in the bottle Košice 2013
Making flying straws What we need: Drinking straws, Paper, Glue, Scissors Košice 2013
Making air rockets What we need: Plastic bottle, Hose,Plastic pipe, Paper,Glue, Scotch tape, Scissors Košice 2013
Thank you dana.mandikova@mff.cuni.cz jitka.houfkova@mff.cuni.cz zdenek.drozd@mff.cuni.cz Košice 2013
