Native people have been building structures in North America for more centuries than we can remember. Their structures have had to withstand the forces of nature; wind, water, rain, and snow.
Which teepee structure can withstand the strongest wind?
Prior to doing the lab, form a hypothesis about which teepee will stand up to the force of the wind the longest.
|8 bamboo skewers or sticks, 25 cm in length
plastic grocery bags
1 small towel, damp with water
electric fan with at least 2 speeds
elastic or string
1. Spread out your damp towel to create a non-skid surface for your teepee.
2. Tie four 25 cm skewers together with a string or an elastic about 2 or 3 cm from one end.
3. Spread out the four skewers to give the shape of a square or rectangle. Space the skewers approximately 15 cm apart.
4. Take a plastic grocery bag and construct a shell to cover the skewers. Use scissors and tape where needed. Make sure the plastic bag is secured to the structure.
5. Place a fan about 50 to 60 cm away from the teepee. Please use caution with the fan. Tie back long hair, and water or wet hands away from electrical outlets. Turn the fan to the lowest setting and record how the teepee responds to the force.
6. After you have recorded your observations increase the speed of the fan and record how the teepee responds.
1. Use scissors or a knife to cut 2 skewers/sticks to measure 20 cm each.
2. Use your two 20 cm skewers and two 25 cm skewers. Tie them together with string or an elastic 2-3 cm from one end.
3. Go to step 3 above and follow the steps with Teepee 2. You will cover the new teepee with plastic and test its ability to resist forces. Remember to keep notes on how the new teepee design reacts to the forces.