TWIRLY BIRDS

What do we call the first twirly bird that we made? (The one that we didn't cut and the one that we used to compare to other systems.)

• outcome

• variable

• standard

• twirly bird

Then, we cut our twirly bird. We changed the variable. What is a variable?

• The original

• Anything that we can change in the system that might effect the outcome.

• The twirly bird

When we cut the wings on the twirly bird, we changed the variable. We also changed the outcome and the how the twirly bird flies. What does "outcome"mean?

• what happens before

• the data

• how the twirl bird flies

When we cut the wings of the twirly bird and dropped it from high above, what was the outcome?

• The twirly bird fell to the ground slower than the standard (original twirly bird).

• The twirly bird fell to the ground faster than the standard (original twirly bird).

What forces cause the twirly bird's motion?

• Gravity pulls it down. The air under the wings pushes against them causing the twirly bird to spin.

• The weight of the tape

• Electricity and magnetism

What other evidence do we have that air can push with a force? Check all that apply.

• Air can lift a kite to make it fly.

• A strong wind can break trees and destroy buildings.

• Air can push and pull sailboats across the surface of the water.

Can you answer today's focus question? What happens to the motion of a twirly bird when the design changes?

Use the sentence frame to help you:

The motion of the twirly bird changed when we ________________.