Activity execution
Let's dive in!
Here's what you need!
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Remember! You should have the straws in two different sizes so that one of them can go inside the other.
| Material | Quantity | Dimension/ size/weight (if applicable) | Alternative (if applicable) |
| Paper cup (with a hole at the centre of it base to pass the bigger straw) | 1 | standard | - |
| Potato slices | 2 | any | - |
| Straw | 2 | One smaller in dia than the other | - |
| Disposable plate | 1 | Standard | Any other plate/ newspaper to put the potato slices |
| Rubber bands | 4 | standard | - |
| Binder clips | 2 | 15mm-20mm | - |
| Tongue depressors | 6 | Standard | Ice cream sticks |
| Wooden skewers | 1 | See in pic below | - |
STEP 1: Take the cup and make a hole at the bottom using a scissor. Be careful when using a sharp-edged tool!
STEP 2: Then you can take the wider straw and try putting it through.
STEP 3: You want the straw to be fixed in its position. Tape it!
STEP 4: On the other side of the cup, we have to fix support for our drill.
STEP 5: Tape two tongue depressors onto the cup as shown.
STEP 6: The drill now has firm support!
STEP 7: Cut the excess straw out.
STEP 8: Insert the thinner straw into the cup through the thicker straw.
STEP 9: Let's make a trigger for our drill machine.
STEP 10: Place two of the tongue depressors one on each side of the thin straw and tighten it up with the paper clips.
STEP 11: Wrap two rubber bands on either side of the trigger.
STEP 12: Finally clamp a paperclip on the other side as well.
STEP 13: Test your drill and get to the core!
Was your drill able to cut through the potato and get the sample?
Yes? Great job! Try it on something else now. Like, a boiled egg!
No? Don't worry. Adjust the Trigger and examine the drill again.Hint: You can also insert the skewer inside the thin straw to make your drill even more pointy!