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So soll die Einbindung zwischen Physics Puzzles Fixpunkte des Rathauses. - Verfügbar aufThis brilliant set of puzzles is sure to challenge and entertain the whole family! The normal forces of contact there are normal to the deformed surface on the forward slope of the depression, and Schiessbude not pass through the center axis of the cylinder, but a bit in front of it. Friction is a drag. Spiele Sudoku that force due to friction has a torque, Seriö this vector torque around the center of mass of the ball is in Zdf Fernsehlotterie same direction as the ball's angular velocity vector.
Hovercraft are supported above the ground by a large fan that forces air downward. The craft moves as if it were on a very low friction surface.
These vehicles also have another fan for propulsion. They are rather large vehicles, so the race promoters designed a circular track that was banked so that vehicles at the inside of the track wouldn't have an advantage.
Apparently the racetrack was never built, and no such races were ever run. Pulling a yo-yo. A yo-yo toy rests on its edge on a level table.
If the string comes out above the axle, what will happen when you pull the string parallel to the table?
Will it roll left, or right? If the string comes out below the axle, what will happen when you pull the string parallel to the table?
If the string is pulled straight up, which way will it roll? At what angle can you pull the string to cause it to slide along the table without rolling?
The coefficient of sliding friction at the interface with the table is 0. Support your answers with analysis of fores. Two identical round pucks rest on a frictionless level table.
One puck is propelled toward a stationary puck. They collide, and the collision is perfectly elastic. Niether puck rotates before or after the collision.
Prove that after collision, the velocities of the two pucks are at right angles, no matter how the collision occurred. Why doesn't this happen?
Morning levitation. Burning the candle at both ends. Harpo Marx burns the candle at both ends. Horse Feathers A candle is trimmed at the bottom so that both ends of the wick are exposed.
A nail or long needle is pushed through the middle of the candle, and is supported on the rims of two glasses.
The candle is then lit at both ends. Typically the candle will oscillate around the axle. Is the resulting motion simple harmonic motion or just periodic?
Is its period constant? Pressure Paradox. An old-fashioned bottle of nonhomogenized milk is left undisturbed. The cream in the milk rises to occupy the narrow neck at the narrower top of the bottle.
Is the pressure of the milk on the bottom of the bottle now the same, greater, or less than before? You know this puzzle is old, for those milk bottles are seldom seen today.
Nor is unhomogenized milk common. However, many food products come in similar narrow-necked bottles. For a modern version imagine such a bottle of oil-and-vinegar salad dressing, shaken up.
Then the oil slowly separates and rises to the narrow neck of the bottle. Note: Many materials, when mixed, occupy a volume different than their total volume when separate.
This is generally a small effect. In this problem, this volume difference will be ignored. It would, in fact, have negligible contribution to the changes of pressure being considered here.
A pendulum has a bucket for the bob. It is half-filled with water. The water freezes. What happens to the period of the pendulum?
Thermal pressure. A solid cube rests on a level surface. The cube is heated by a large amount. Does the pressure the cube exerts on the surface, increase?
Disregard relativistic effects and stick to classial physics. Explain your reasoning. A large ship moored at the dock has a rope ladder hanging over its side all the way into the water.
Its steps are 30 cm apart, and 20 steps are above the water. After 6 hours how many steps are above water? Stubborn Ball.
A smooth ball rests at the junction of the floor and a tilted wall. When bodies are in contact, there's a force at the interface, directed along the normal to the contact surface.
We show the force due to the tilted wall green at B and the force due to the floor blue at A. The blue vector has no horizontal component, so it doesn't cause rolling of the ball.
But the green vector does have a horizontal component. Why doesn't that force cause the ball to roll away from the wall? A simple pendulum has a small mass B attached to a string of negligible mass suspended from a fixed support F.
The tension of the string is not constant during the swing. Rigid bodies. Newton's laws are said to be universal, that is they apply everywhere and at all times, at least for macroscopic large scale phenomena.
Nearly every mechanics textbook has a chapter dealing with rigid bodies. Those are bodies that maintain their physical shape exactly during interactions.
Show that perfectly rigid bodies cannot exist, for they would violate Newton's laws. Weighty matters. Textbooks often define the weight of a body as the force that gravity exerts on a body at the earth's surface.
But later on, they speak of situations where a body is fully or partially immersed in a liquid, and speak of "the loss of weight" of a body immersed in liquid.
Then when discussing orbiting manned earth satellites they speak of "weightless astronauts". It is said that physics is a "precise" science, but it seems the language used in textbooks is far from precise.
Resolve this dilemma. Leonardo's goof 1. Leonardo da Vinci's notebooks have a number of errors. Source: Leonardo da Vinci, Codex Arundel, folio , drawing no.
Two people inside turned the cranks that drove the wheels. The gearing is the common "lantern gear" of the time. Ignoring the trivial observation that it would take two very strong men to power this, why wouldn't this work?
There's no record that it was ever built and used. Lenardo's goof 2. Lenardo da Vinci's notebooks have a number of errors. Here's one showing water streams from holes at various heights in a water tank.
What's wrong with this diagram. How should it look? Leonardo's aerial screw. Codex Atlanticus. Leonardo's goof 3. Leonardo da Vinci proposed several ideas for man-powered flying machines.
One, called the "aerial screw", had a rotating screw-shaped airfoil, powered by two men on the platform below, turning cranks.
Aside from the trivial observation that even two men wouldn't provide enough power, this idea has a serious flaw of physics that would prevent it from staying aloft.
What is it? Obviously this idea didn't fly. Textbooks often say that when an object is at the focal plane of a converging lens, the light from it, passing through the lens, forms a real image "at infinity".
However it can equally well be said that it also forms a virtual image "at minus infinity", easily seen by looking through the lens toward the light source.
So a single lens is producing two images. How can this be? Are we playing fast and loose with the word "infinity" here?
In some mathematics courses teachers used to say "parallel lines meet at infinity". More careless language, it seems. Resolve this confusion.
This raises another question. But is this all? Does a lens produce any other images? If you are right handed, your mirror image is left handed.
If you touch your right ear, your image touches its left ear. But your image is not standing on its head. At first this seems paradoxical for the mirror is symmetric about its normal.
You can rotate the mirror around its normal axis, and the image does not rotate. So why isn't the image also symmetrical about this normal? Resolve this confusion with a simple argument.
You must be careful and precise in your use of language. Virtual image rotation. A Dove prism has the interesting property that when you look through it and rotate it, the image rotates through an angle twice as large as the prism was rotated.
If you don't have such a prism, use an equilateral prism, looking through it, as shown, so that the light has internal reflection at one side of the prism.
Up periscope. Submarines played an important role in WWII. You have seen those movies where the captain looks for enemy ships through a periscope, a long narrow tube extending upward to just above the water surface.
Those were days before TV and fiber optics, so the periscope used only lenses and reflecting prisms. You know that looking through a long, narrow tube you cannot see more than a very narrow field of view, yet periscopes could see a much larger field.
These periscopes could be 30 feet long and six inches in diameter. Looking through such a tube you'd see a field of only one degree.
How can this be done using only an optical system with glass lenses? The physics of falling. Every introductory physics textbook tells you that in the absence of air drag, two bodies of different mass fall with the same acceleration, that is, they will fall equal distances in equal times.
Galileo is usually mentioned in this context, though others did the experiment before him, and he probably never did the experiment with freely falling bodies certainly not at the leaning tower of Pisa.
But Galileo had a simple logical argument to conclude that the mass of the falling body does not matter.
Remember that in Galileo's time algebra had not been invented, and calculus came along even later. So how did Galileo conclude this important result, using only a simple logical argument?
Weighing a moving system. Weight reduction? We are often told that if we keep moving we'll lose weight. But does a moving object's weight depend on its motion?
A classic physics laboratory experiment is an Atwood machine: two unequal masses on the end of a string passing over a pulley.
The system can be made to accelerate slowly enough to easily measure its acceleation, and with a little mahematics, determine value of the acceleration due to gravity.
The Atwood machine shown is suspended from a spring balance. Suppose the heavier side right side hanger is fastened to the hook of the spring balance by an additional thread, preventing the masses from moving.
The restraining thread is burned or cut and the system is set in motion, the left side rising and the heavier right side falling.
While the masses are in motion the spring balance reads the same as before. Explain why. When discussing kinetic theory, textbooks often model an ideal gas as a box with infinitely massive walls containing very tiny particles bouncing from the walls.
Part of the argument considers one such particle bouncing from the wall. We are told that the collision is perfectly elastic and the particle rebounds from the wall with the same speed it had before hitting the wall.
That tells us that the ball rebounds with unchanged kinetic energy, which students are all too willing to accept uncritically.
We reasonably conclude that no energy was lost to the wall. But what about momentum? So how can the wall gain momentum without gaining any energy?
Are textbooks deceiving us again? Resolve this with an energy and momentum calculation. Elastic definitions. Textbooks tell us that a perfectly elastic body is one which, when deformed, returns to its original shape without loss of energy.
They also tell us that a perfectly elastic collision is one in which the participating bodies conserve both kinetic energy and momentum.
But consider a bell, made of brass with a brass clapper. Bells and their clappers are made of nearly elastic metals, and both preserve their shape after many collisions.
A perfectlhy elastic collision is one that conserves mechanical energy without loss to dissipative processes. The collision of clapper and bell is not a perfectly elastic collision, for considerable energy is lost as sound, radiated away from the bell.
Also the swinging bell and clapper soon come to rest, so you know their energy was dissipated somehow. So how can elastic bodies undergo inelastic collisions?
Resolve this apparent contradiction. Idle question: Would a bell and clapper made of perfectly elastic materials make any sound?
Textbook treatments of relativity sometimes illustrate the "equivalence principle" with the example of a person in an elevator. The elevator cable breaks and the hapless occupant falls with the elevator, experiencing a "weightless" condition in which he floats freely in his elevator frame of reference as if there were no external forces acting.
Textbooks often say that the person inside would be unable, by any experiment, to determine that there was a gravitational field in his elevator.
This example is, of course, flawed, for with sensitive instruments a person in the elevator could detect the gravitational field. Ellipse or Parabola?
Physics textbooks spend much space discussing trajectories of projectiles in the earth's gravitational field. But Newton tells us that the path of a cannonball in the absence of air drag is a portion of an ellipse with the center of the earth at one focus.
The famous picture "Newton's mountain" illustrates this. So if you were asked "What is the path of a projectile, an ellipse or a parabola? Newton's third law says: If body A exerts a force on body B, then body B exerts and equal and oppositely directed force on A.
Newton's other laws would be useless without this important law. Newton's laws are said to be universal, applying everywhere and at all times.
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. Submit Solution. Physics Puzzles 2 - Balloon in car riddle. Physics Puzzles 3 - Magnetic rod riddle.
Where does bad light end up? In a prism. What do you get when you mix sulfur, tungsten, and silver? How many theoretical physicists specializing in general relativity does it take to change a light bulb?
One to hold the bulb and one to rotate the universe. Why does hamburger have lower energy than steak? Because it's in the ground state.
What did the physicist snack on during lunch? A 'gram' cracker. Interactive knowledge boards suitable for online classes, school lessons and home education.
With these free online games, the player may learn and study something interesting about the physical classifications, interesting subjects and topics.
Completing every class puzzle increase the knowledge level. Physics learning puzzles. Online learning games. Interactive Physics Workshop - Puzzles.
Additional fun applications for learning physics. Fun Physics Puzzles Collection. Car Comparison - Sort the cars by their highest quality.
Engine Types Puzzle - Sort the engines on the correct vehicles.