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Physics Puzzles

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Brain It On - Physics Puzzles

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Physics Puzzles All physics puzzles (14): Video

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Physics Puzzles

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Thank you so much for 5 stars!

Because it always has lots of problems. What would you call a clown in jail? Silicon Silly Con. Why couldn't the moebius strip enroll at the school?

They required an orientation. What animal is made up of calcium, nickel and neon? A CaNiNe. What is the simplest way to observe the optical Doppler effect?

Go out at and look at cars. Length Comparison - Sort the objects by order of length magnitude. Power Comparison - Sort the objects by their correct power value in Watts.

Speed Comparison - Interactive fun diagram for speed of objects. Car Parts Puzzle - Assemble the parts of the automobile.

Interactive car structure. Rocket Parts Puzzle - Assemble the parts of the rocket. Interactive rocket structure. Train Parts Puzzle - Assemble the parts of the steam locomotive.

Interactive train structure. Bicycle Structure Puzzle - Build yourself a bicycle. State the definition of friction so that it cannot be misinterpreted.

Racing photons. Consider light passing through a converging lens from a point source to a point image. The light rays passing through the lens near its edge must travel a greater distance from source to image than do the rays passing through the center of the lens.

Wouldn't this make the rays arrive at different times and possibly cause destructive interference at the image?

Unweaving a spectrum. Sir Isaac Newton is famous for his experiments with light and prisms. He showed that the light passing through a prism separates disperses into a colored fan spectrum.

He also showed that if that colored light is then passed through another prism, properly arranged, it can be recombined into white light.

Thus, he argued, the colors are actually in the white light, not created by the prism. Here's a gallery of examples from the web, supposed to illustrate this experiment.

Textbooks and web pages frequently illustrate this experiment with such pretty pictures—and get it terribly wrong! Google prism recombine white light and view the images.

Most of the images will be wrong in one or more serious ways. This is a telling example of why the web is called "the misinformation highway", for it is dangerously compromised by potholes.

If you tried to duplicate this experiment in the lab, following these examples, you would surely fail. Identify the errors in each of these.

What is a correct way to decompose white light into colors and then recombine it into white light?

There are several ways. I once had a student who wanted a project for extra credit to raise his unimpressive average. I suggested he go into the lab and duplicate this experiment.

He copied textbook illustrations and failed every time. He was frustrated. Finally I suggested he might find out where the college library was, then locate Newton's "Optiks".

There he found out one way to do it successfully. The Soda Can. Here's a puzzle from Martin Gardner's collection. It is an old problem, but the method is still instructive.

Assume that a full cylindrical can of soda has its center of gravity at its geometric center, half way up and right in the middle of the can.

As soda is consumed, the center of gravity is initially lowered. When the can is empty, however, the center of gravity is back at the center of the can.

There must therefore be a point at which the center of gravity is lowest. Knowing the weight of an empty can and its weight when filled, how can one determine what level of soda in an upright can will move the center of gravity to its lowest possible point?

To devise a precise problem assume that the empty can weighs 1. It is a perfect cylinder and any asymmetry introduced by punching holes in the top is disregarded.

The can holds 12 ounces 42 gram of soda, therefore its total weight, when filled, is Reverse Osmosis. A correspondent from New Zealand sends us this ingenious idea that he saw in the Dec.

We'll let him describe it: Osmosis is a process where water flows through a semi-permeable membrane from a less concentrated to more concentrated solution.

Reverse osmosis is where water flows through the membrane from a strong solution to a weak one. Of course you must have pressure behind the membrane to make it flow the "wrong" way.

To get fresh water to flow from seawater through a membrane takes a pressure of about 20 atmospheres. This is the basis of desalinating devices used on large ships.

Now, at this depth the head of salt water in the ocean around the end of the pipe is more than 20 atmospheres, say 21 atmospheres, so fresh water flows out of the ocean salt water into the fresh water pipe.

You may have to adjust the depths a bit depending on the density of the sea water but the principle seems plausible.

Not only will this device give an endless stream of fresh water but can be used to run a small generator. The figure shows the tube in the ocean, its top end curved to direct water to the little water wheel, W.

You've gotta love perpetual motion proposals that are so simple, with no moving parts, and hold promise of solving our world energy problems and our fresh water resource problems as well.

That is, if only we can get enough of these machines running at once. Pressure in the ocean varies linearly with depth, increasing by about 1 atmosphere for each 10 meters of depth.

So the pressure in the ocean at a depth of about meters feet is 20 atmospheres above atmospheric pressure. This fact may or may not be helpful. This seems to be a great idea.

But it won't work. Why not? An answer is given in the April. See also the June issue. Which egg is boiled? This is a very old problem.

Two eggs are on the table, one is fresh and one has been hard boiled. How can you determine which is boiled without breaking their shells? Which is hollow?

Two spheres have the same diameter, weigh the same, and are painted the same color. One is solid, of lightweight material. The other is a hollow shell made of denser material.

Without damaging them, how can you tell which is hollow? An attractive puzzle. This puzzle is often criticized for perceived ambiguity.

Here's a version with most of the ambiguity removed. You are given two iron bars, identical except for the fact that one bar has been magnetized, the other is not magnetized.

Using nothing other than the two bars and your hands, how can you determine which is the magnet? We will allow gravity to operate as usual on you and the bars.

Heat one of the bars very hot and let it cool. If the bars no longer attract as strongly, then the one you heated was the magnet.

Drop one repeatedly on the floor. If the attraction between the bars is reduced, then the one you dropped was the magnet.

But we ruled these out by specifically requiring that you must use only the bars and your hands. No string or wire can be used, no other metal, and nothing to heat a bar.

You can't even use the magnetic field of the earth. So what is the simplest way to identify the magnetized bar? One answer, well known, is the "T" test.

Place the bars touching in a T configuration, with the end of one at the center of the other. If they attract, then the one which is the upright of the T is the magnet, for the other has its poles at either end and no pole at its center.

But magnets of high permeability materials can be made with many poles, for example one with a [N SS N] arrangement.

Such a magnet would not tend to point north when suspended and might fail the "T" test. What's the simplest way to identify the magnet, no matter how that magnet's poles are arranged?

Which is longer? Prepare two metal tubes. Mine are cut from 1 inch diameter aluminum tubing from the hardware store. One tube is 11 inches long.

Try to ensure that the tubes have no scratches or imperfections that could distinguish one from the other. Hold them up, one in each hand, and ask if anyone can visually see that one is shorter than the other.

Of course no one can. Hold them side by side, touching, and the difference is obvious. Ask someone to take them, then turn around to hide them from your sight, choose one, and then hand it back to you.

You pretend to judge its length between your hands, touching the tube at its ends, only with your fingertips. What is your secret? Rolling paradox.

Physics textbooks define the force due to friction as a force tangent to two surfaces at their point of contact. Consider a ball or cylinder rolling without slipping on a perfectly flat and level surface.

We expect it to slow down. We naively assume that friction is the reason it slows down, eventually stopping. Certainly the friction is opposite to the ball's velocity, and would therefore decelerate the ball's motion by Newton's second law.

But that force due to friction has a torque, and this vector torque around the center of mass of the ball is in the same direction as the ball's angular velocity vector.

This would increase the ball's angular velocity, making it roll faster and faster. When inventors first proposed railway transportation, using steel wheels on steel rails, some skeptics said "The wheels will just spin in place, and the contraption won't go anywhere.

Physics puzzles. Physics questions fall into several categories. The bootstrap principle. The tall tales of Baron Munchausen include the story of his narrow escape from a sticky situation when he was mired in a bog.

The resourceful Baron reached down and lifted himself up by pulling on his bootstraps. We know that is impossible, but can a person, using physics and a pulley system, lift himeself using only his own strength?

Consider the system shown. A lightweight chair is used, with an overhead pulley. Can this work? Are there any limitations on this system?

Show the vector analysis with free body diagrams. At rest. Rare is the physics book that doesn't say something like "The net force on a body at rest is zero" in the chapters on statics.

And it also says that if the net force is zero, the acceleration of the body is zero. Then, in the dynamics chapters, we may see "A body thrown straight upward is momentarily at rest at the highest point of its trajectory".

The student then logically concludes that at that point the net force on the body is zero at least for an instant and therefore its acceleration at that point is zero.

Can we blame students for taking textbooks at their word? Can you resolve this apparent contradiction? Lost energy?

The capacitor paradox. This capacitor paradox has been discussed on the web and in published papers, yet people still argue about it.

Obtain two identical capacitors. Charge one of them. Then connect them together so that the charge is shared equally by both.

A simple calculation shows that the energy of the two charged capacitors after this operation is only half that of the single initially charged capacitor.

What happened to the lost energy? Of course, one immediately suspects that energy is lost by heating the connecting wires. So we idealize the problem and use resistanceless connecting wires.

Still, we must consider energy radiated away by the accelerating charges during the initial process of closing the switches and in the subsequent acceleration of electrons during the redistribution of charge.

Yet published papers argue about the details of these processes. So what's going on? Is circuit theory and classical electromagnetic theory wrong?

Can you resolve this simply? Grasping straws. We have all done this demonstration, using a drinking straw and a glass of water. Insert the straw in the water A , close off the top of the straw with your finger, then raise the straw, keeping the top closed.

This lifts a column of water inside the straw B in spite of the open end. What physics is being demonstrated?

We do not normally look at details of this simple demonstration, but what about the lower end of the straw?

There's a surface of water there, exposed to the air. What is its shape? It bulges downward. It bulges upward. It is nearly flat. Support your guess with a valid physical argument.

Now let's make it more interesting. Make a hole in the drinking straw at about two inches from the bottom.

Make the hole as large as the end openings of the straw. Now immerse the straw in the water glass. The side hole must be below water level.

Now close the upper end of the straw with your finger. Lift the straw until it is entirely out of the water C.

What do you predict will happen? Support your answer by an argument based on physical laws. Specifically discuss what's going on at the side hole.

Now try it. A slippery slope. If you are descending a slippery slope in a car, would you retain better steering control if your front wheels or your rear wheels locked up?

Powerful magnets? One often hears strong magnets described as "powerful". But are they a source of power? I often hear people argue that magnets must be an inexhaustable source of power.

They cite the lowly refrigerator magnet, saying "It supports its own weight on the wall of the refrigerator forever, or at least for many years.

So magnets must be a source of considerable energy. What is wrong with their argument? Gravity enhancement. He used a sensitive torsion suspension to measure such a small force.

Suppose we have a liquid in a U-tube, in equilibrium, and then place a heavy lead ball red just under the left side of the tube. How will this affect the liquid levels in the tube?

Every minute, Gear B makes 15 complete turns. What is the relative speed of Gear A and Gear B? By clicking "Sign up" you indicate that you have read and agree to the privacy policy and terms of service.

Physics Puzzles. The Latest and exclusive collection of Physics Puzzles to tease your brain. Physics Puzzles helps exercising the brain and develop it to think logical and solve real world problems differenlty.

Physics Puzzles 1 - Water flowing puzzle. View Solution.

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Physics Puzzles
Physics Puzzles

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Physics Puzzles Physics textbooks define Polen Zeitzone force due to friction as a force tangent to two surfaces at their point of contact. The entire spring falls, retaining its stretched length until the lower end hits the floor, then the rest of the spring falls, compressing as it goes. Why does hamburger have lower energy than steak? Nor is unhomogenized milk common. At rest.

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