Hands-on science (no lab required).Check out these two hands-on experiments after you've read "Another Lunar Leap?" (p.8) and "Slam-Dunk Science" (p.14). They're fun and foolproof! SPLITTING WATER According to according to prep. 1. As stated or indicated by; on the authority of: according to historians. 2. In keeping with: according to instructions. 3. the article "Another Lunar Leap?" astronauts could use electrolysis electrolysis (ĭlĕktrŏl`əsĭs), passage of an electric current through a conducting solution or molten salt that is decomposed in the process. to mine hydrogen locked in the moon's ice. Experiment with batteries to split water. YOU NEED: plastic cup * 3/4 cup water * 1/4 teaspoon salt * spoon * two paper clips * index card * 2 pieces of aluminum foil Noun 1. aluminum foil - foil made of aluminum aluminium foil, tin foil foil - a piece of thin and flexible sheet metal; "the photographic film was wrapped in foil" , each 10 cm (4 in. by 12 in.) * C-cell battery TO DO: 1. Fill the cup with water. Add salt and stir. 2. Uncurl and straighten the two paper clips so that there is just one hook on Verb 1. hook on - adopt; "take up new ideas" fasten on, seize on, take up, latch on sweep up, embrace, espouse, adopt - take up the cause, ideology, practice, method, of someone and use it as one's own; "She embraced Catholicism"; "They adopted the Jewish each paper clip. 3. Poke See peek/poke. poke - The BASIC command to write a value to an absolute address. See peek. the paper clips through the center of the index card so they are about 2.5 cm (1 in.) apart. 4. Place the index card on top of the cup of water. The ends of the clips should be submerged in the water with the "hooks" on top of the card. 5. Fold the aluminum foil in half lengthwise length·wise adv. & adj. Of, along, or in reference to the direction of the length; longitudinally. Adj. 1. lengthwise three times. 6. Wrap one piece of aluminum foil around each paper clip's "hook." Leave about two inches of foil loose. 7. Touch the ends of the foil to the terminals (ends) of the battery. 8. Observe the water near the ends of the paper clips. CONCLUSIONS: What happened to the water near the paper clips? Explain. DON'T STOP NOW: Research: What is the ratio of hydrogen atoms to oxygen atoms in a water molecule? HEFTY LEVERS In "Slam-Dunk Science," you read about how the position of a pivot point Pivot Point A technical indicator derived by calculating the numerical average of a particular stock's high, low and closing prices. Notes: The pivot point is used as a predictive indicator. can determine whether a slam dunk shatters the board or barely twists the rim. Try your hand at increasing torque with this activity. YOU NEED: hardback book (about 2.5 cm- or 1 in.-thick) * pencil * marker * masking tape TO DO: 1. Place the book flat on your desk. 2. If you are right-handed, tape a pencil to your desk about 4 cm (1.5 in.) to the right of the book. The pencil should be parallel to the book. If you are left-handed, tape it to the left of the book. 3. Stick a piece of tape to the desk along the edge of the book. This will mark the book's initial position in case it slides during the experiment. 4. Place the marker on top of the pencil so it forms a "T" with the pencil. Put the end of the marker under the book. 5. Place your index finger on the tip of the marker. Push down. Is it hard or easy to lift the book with the marker? 6. If the book slid during step 5, realign re·a·lign tr.v. re·a·ligned, re·a·lign·ing, re·a·ligns 1. To put back into proper order or alignment. 2. To make new groupings of or working arrangements between. it. Now, move your index finger closer to the pencil and push again. CONCLUSIONS: When was it easiest to lift the book? How does this experiment relate to Dixon's force on the rim in "Slam-Dunk Science"? |
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