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- A. General Materials & Mathematics
- B. Statics
- C. Kinematics & Dynamics
- D. Rotational Mechanics
- E. Gravitation & Astronomy
- F. Fluid Mechanics
- G. Vibrations & Mechanical Waves
- H. Sound
- I. Thermodynamics
- J. Electrostatics & Magnetostatics
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- P. Modern Physics
Fan Cart
Purpose
To illustrate the third law of motion.
Equipment
Fan cart with plastic sail, as photographed.
Suggestions
Activate the fan with the sail in place while holding the cart to show the flex of the sail and make your students think. Ask the students to predict what will happen before doing the experiment.
Images
Description
With the sail unmounted, turn on the fan and release the cart; it moves in the direction opposite to that of the blowing air. Mount the sail and blow into it with your breath; it moves in the direction which you are blowing. Finally, with the sail in place turn on the fan and release the cart. Q: What will the cart do with the sail in place and the fan operating: (a) move in the direction of the air, (b) move opposite to the direction of the air, or (c) remain at rest. A: It will remain at rest.
References
Meiners, Physics Demonstration Experiments, Section 9-4.5, page 195. Lewis Epstein, A Self-Propelling Mechanism, TPT 8, 332 (1970). Steven R. Smith and Jerry D. Wilson, A New Design to Demonstrate Newton's Third Law, TPT 10, 208-209 (1972). Jerry Wilson, Newton's Sailboat, TPT 10, 300 (1972). Richard S. Murphy and Jack Van Geldren, Letter: A Note from the Real World, TPT 16, 260 (1978). David L. Mott, Letter: A No-Sail "Boat," TPT 16, 426 (1978). B. L. Blackford, The physics of a push-me pull-you boat, AJP 46, 1004-1006 (1978). B. L. Blackford, A push-me pull-you wind vehicle, AJP 49, 28
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See pagesc1. center of mass motion
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See pagesc3. first law of motion
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See pagesc4. second law of motion
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See pagesc5. third law of motion
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See pagesc6. friction
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See pagesc7. collisions
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See pagesc8. mechanical energy & power
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See pagesc1. center of mass motion
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See pagesc3. first law of motion
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See pagesc4. second law of motion
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See pagesc5. third law of motion
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See pagesc6. friction
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See pagesc7. collisions
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See pagesc8. mechanical energy & power