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Physics
10th -
12thgrade
Why Don't Perpetual Motion Machines Ever Work?
5 questions
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- 1. Multiple Choice
Three out of the four people below seriously pursued (at least for a time) the search for a working perpetual motion machine. Who's the odd man out?
Bhaskara the learned
Rube Goldberg
Robert Boyle
Leonardo da Vinci
- 2. Multiple Choice
Which of the following correctly describes a perpetual motion machine?
A machine with infinite sources of energy
A machine that re-uses all the energy it expends
A machine with no zero velocity points
A machine that can do work with no power source
- 3. Multiple Choice
Why will Bhaskara's wheel stop spinning?
Flawed axle design
Needs to be placed in a vacuum
The center of mass is lower than the axis
Mercury is too dense
- 4. Multiple Choice
Why won't the capillary bowl work?
The capillary force is too weak
It requires extra energy to free the droplet
It doesn't work with modern-day tubes
It could only work in zero-gravity conditions
- 5. Multiple Choice
Why does the second law of thermodynamics make perpetual motion machines impossible (to date)?
Energy is always conserved
Energy will always leech out of a system as heat
There is no negative work
Systems try to achieve equilibrium
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