| A | B |
|---|
| Under waht conditions will an airplane maintain a constant speed? | The forces of lift and gravity are equal and in opposite directions, and thrust and drag are equal and in opposite directions. |
| What happens when lift is greater than the weight of an airplane? | Because an unbalanced force is present, the plane will accelerate upward. |
| How can a small airplane have the same momentum as a larger airplane? | Because momentum= m x v, the small airplane can have the same momentum as the larger airplane when the small airplane's velocity is greater. |
| What are the contact forces that interact with an airplane? | Thrust, drag from air resistance, and lift. |
| Explain what happens to an airplane as it goes into a free-fall dive | The plane will accelerate at a constant rate until the force of air resistance equals its weight due to gravity. Then it will reach its terminal speed because forces are balanced. |
| Change in speed divided by time | acceleration |
| forward force | thrust |
| mass times velocity | momentum |
| force toward earth | gravity |
| occurs when upward force of air equals downward force of gravity | terminal speed |
| air resistance | drag |
| upward force of air | lift |
| faster moving air exerts less pressure | Bernoulli effect |
| the relationship between force, mass, and acceleration | Newton's second law |
| occurs when lift equals the plane's weight | stall speed |
| A plane can fly upside down and still get lift because of (blank). | the angle of attack |
| When the thrust of an airplane is tripled and all other forces remain constant, the airplane's acceleration (blank). | increases 3 times as much |
