PRINT THIS ANSWER SHEET TO FILL OUT AND TURN IN.

NAME_________________________________ CLASS____________________ DATE____________

## Newton's Third Law Worksheet

1. What is the action - reaction pair of forces acting on the airfoil as indicated by the arrows?_____________________________________

2. The weight force is the product of the mass multiplied by the acceleration due to gravity. If a DC-10 commercial passenger jet weighs 200,000 kilograms and gravity is 9.80 m/s2, calculate the weight force: ___________________.

3. If the DC-10 in the previous question is flying at a constant altitude so that the action- reaction forces are balanced, what is the lift force acting on the jet? ____________________

4. As the jet in the above question travels at constant velocity, it burns fuel, which decreases its weight to 165,454 kg, a safe weight for landing. In response to this decrease, what is the new lift force acting on the jet when altitude is maintained? ____________________

5. In a department store, a large fan blows upward, keeping a beach ball at a constant height above it. What exerts the action force on the beach ball? ________________

6. In the example above, what is the reaction force on the beach ball? ________________

7. If the beach ball above weighs 280 grams, what are the magnitude and direction of the action force on the beach ball? _________________________

8. When the fan blowing on the beach ball above is turned off, how do the action and reaction forces compare?________________

9. Once the beach ball has landed on the ground, what exerts the action force?
__________________________ the reaction force? _________________