# Questions tagged [home-experiment]

questions concerning measurements, experiments, and activities that demonstrate physics and are safe to do at home, require at most one tool or ingredient not readily available, and can be interpreted or analyzed on one sheet of paper with accessible math.

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### Do-It-Yourself physics experiment [closed]

Is there any simple experiment in physics of the first half of the 20th century I could do at home? I tried to make a cloud chamber, but it didn't work at all... A spectrometer from a CD disk is ...
360 views

### What are some household sources of radiation detectable with a geiger counter?

I recently started rock tumbling with my preschool-age kids and bought a cheap geiger counter to check out rocks we find (more from curiosity than concern). Specifically it's a GQ GMC-500Plus model ...
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1 vote
52 views

### What happens when you shake a coke bottle too hard?

I've been thinking about this recently : what happens when you shake a coke bottle too hard? I know that shaking a coke bottle and opening it would release the coke. So if I tried it, what would ...
1 vote
24 views

### Hole in Bernoulli's theorem

According to Bernoulli's theorem while blowing a paper ball inside the bottle, speed of air at the mouth of bottle is higher and hence creates low pressure relative to inside air, so the air blows ...
1 vote
130 views

### Why does the air pressure not increase when I shake a coke bottle?

I tried this experiment lately and this happened, I shook a coke bottle and its air pressure remained the same but the coke came squirting out when I opened the lid. How is this possible?
82 views

### Does mass affect distance travelled by a toy car?

Say, I conduct an experiment with a toy car and a ramp (Fixed angle). If I were to use the same toy car but place different weights on it (assuming the same size and shape), would the car with more ...
747 views

### How can I test relative friction at home?

My 7 year old is anxious to test whether or not banana peels are slippery. He has been waiting for 2 years for the science fair to come back. We have the idea to test different types of banana peels (...
57 views

### Trampoline physics: Why do rectangular trampolines provide more "bounce"

The guys over at reddit.com/r/trampoline say that a rectangular trampoline has a larger sweet spot AND provides more air. Typical dimensions are 9x15 10x16 to 10x18 I can see the following cases: ...
53 views

### Why doesn't temperature decrease with an increase of volume in the syringe?

I made an experiment using a closed syringe with the volume marks. At the beginning, the piston is at $5\rm\, ml$, then I move it to $20\rm\, ml$. Since the change is approximately adiabatic, we can ...
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### Would spinning a magnet in a coil of copper wire induce a Electromotive Force?

I would like to do a lab for school which compares the Electromotive Force generated by spinning different types of magnets (paramagnetic, diamagnetic and ferromagnetic), within a copper wire. However,...
48 views

### Forces acting on the force sensor in the accelerated reference frame

I am doing a thought experiment in which two bodies are rigidly connected to each other and my force sensor is rigidly located between these two bodies. My system accelerates and brakes at regular ...
43 views

### Proving One electron wave in nearest orbit of hydrogen atom [closed]

My physics assignment had this question: "Show that the orbit nearest to the nucleus in a hydrogen atom accommodates one electron wave. Given that the energy of the electron in the orbit is 13.6 ...
25 views

### Inflating an conductive balloon with charge

Assume you have a deflated, thin film, conductive balloon. When left alone, the balloon would lay flat on a table. Now assume that the balloon has charge. With enough charge, would the electrostatic ...
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### How can we detect neutrons?

If I am asked to design a simple experiment to detect neutrons, how can I do that? The problem is, neutron is a neutral particle. So, application of electric and magnetic fields won't help. Can I ...
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### What is required for a minimum viable Bell test experiment at home?

My objective is to create a tabletop Bell test experimental setup generating data of suitable quality for undergraduate education or satisfaction of personal curiosity; remaining free from loopholes ...
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### How would one measure the frequencies of different sounds/music?

I'm doing a science fair project and I'm trying to measure which frequencies are unappealing/appealing to the human brain and how they react to said frequencies. I've looked around for a little bit ...
1 vote
59 views

### Energy not conserved?

Let us suppose a stone of $4$kg mass falls from $5$ meter above upon an iron rod of the same mass which was entering the ground. Consequently the rod entered $10$ cm more deep into the ground. Now ...
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### How to find radial and tangential force for non-uniform circular motion? [closed]

I am currently studying the non-uniform rotational motion of a pulley under the force of a falling weight. If for instance we observe the motion of a black point mass on the pulley with: $\theta$= ...
• 23
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### How to calculate energy loss from falling balls?

Good evening, I am doing a science investigation about "Which surface will affect the energy loss of a bouncing basketball the most?" and I am having trouble calculating the energy loss for ...
2k views

### Radiation from Sticky Tape [duplicate]

I was pulling off some duct tape (black Gorilla tape) from the side of my stand-alone air-conditioner unit in the dark. Although stuck on well, the tape was fresh and came off cleanly from the plastic ...
68 views

### How to demonstrate that light carries angular momentum by making an object rotate?

Electromagnetic fields, carry angular momentum. However, I want to demonstrate by an experiment and convince a bunch of high school students, that electromagnetic fields do carry angular momentum. To ...
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### Simple, vivid way to demonstrate the rotation of the Earth

What is a simple, vivid and compact way to demonstrate the rotation of the Earth? Something you could keep on your desk and that a middle-schooler or flat-earther could understand? I considered ...
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550 views

### Varying the height of a projectile and effect on range-experiment

I am investigating the effect of varying the height of which a ball is rolled down a slope on the range of the projectile (see image attached for experiment set up). I am getting really stuck on ...
31 views

### Stack top packed lunch lid is getting foggy with frozen water

I'm preparing some lunch and freezing it in packages. I store the packages in the freezer in a stacked manner: After a long time in the freezer, I noticed that the top package lid gets foggy with ...
• 181
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### Magnetic field of a cylinder surrounded by another cylinder

I made an experiment for a school presentation where I have to measure the magnetic field in the space arround a circular cylinder of cross section $S = \pi r^2$ through which passes a uniform current ...
1 vote
75 views

### Folding a paper

I have always amused at the how things are able to retain their shape For example A paper that has been rolled up for a long time tries to retain its form when straightened A paper rolled/folded along ...
• 21
174 views

### Why does lemon sink in diet cola?

I have made a funny homemade experiment, repeatable, and with a high success rate over 6 bottles of cola. I haven't found any trace on internet. It reminds me the Mentos-Diet Coke experiment, but I am ...
33 views

### How to calculate/understand the Lorentz force of a continueous charge distribution

I know that the Lorentz force formula is $$F=\iiint \rho(E+J\times B)dV$$ for continuous charge distribution. But is E the electric field that creates the current (density) J, or this is another ...
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1 vote
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### Differentiating between gas discharge and cathode ray

I am trying to build a cathode ray tube but my vacuum pump is a fridge compressor which sucks at achieving a good vacuum! However I am getting a cathode ray like glow inside the vacuum chamber. Now to ...
30 views

### Needed precision for detecting effects in experiments

I did a bayesian fit to experimental data with a physical model. I notice that some effects cannot be detected due to the precision of the data and the physical model doesn't fit in the best way. So I ...
• 1
331 views

### Can we set an object into both translational and rotational motion with only 1 force

It is said in my textbook that to set a puck into both translational and rotational motion, we can simultaneously push the puck (with any linear velocity) and rotate it (with any angular velocity). I ...
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### Dark fringes in the bright fringes while doing Young's double-slit experiment

The above image shows the bright and dark fringes that I got while doing Young's double-slit experiment. Increasing the distance of screen from the slit increases the width of the bright fringes. So ...
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118 views

### How does the pendulum method for measuring the moment of inertia work?

I'm a high schooler that's trying to design an experiment regarding angular momentum, and that requires me to find out the moment of inertia of a complex object. I searched online and saw that you ...
1 vote
72 views

### Why do cocoa and flour do *that thing*, with the clumping, when mixed with liquid?

You're getting ready to make hot chocolate, or maybe a roux. You put the cocoa or flour in the milk. You stir. The milk is still milky. There are lumps, clumped together, of the powders. If you "...
82 views

### Why didn't the pen bounce up when dropped for the second time?

Actually see this video first. I'll try to explain what happened in the video : When the pen is dropped in such a way that there is no gap inside the cap (or in between the tip of the cap and the ...
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### Simplifying acoustic test procedure -- don't want to bother neighbors with party!

I am having a party and would like to keep disturbing neighbors to a minimum, but maximize the volume we can get away with. I devised a quick n' dirty test plan to generate some frequency response ...
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389 views

### What's the reason behind such a strange motion of floating particles in stationary water?

Well one day I noticed something really strange about the motion of floating particles in "stationary water" (in the first video the water was stationary). (Actually the particles might not ...
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### Why do I hear static when I plug in my earphones incorrectly?

I use simple earphones which are wired with my laptop. Most of the times I unconsciously plug them in without looking and at times instead of going in the port they touch the laptop body near the port ...
35 views

### Has anyone actually tested the book stacking problem with a lot (at least 50) books/playing cards/blocks of wood?

....And does anyone have a picture or video to prove it? https://mathworld.wolfram.com/BookStackingProblem.html I like seeing experiments in real life because Maths and Physics is so theoretical. I ...
1 vote
61 views

### White light interferometer, how much precise must be?

I am trying to build a small interferometer, but after many attempt, I still can't see any fringes or interference effect. How much precise need to be the surfaces and the angles to see interference ...
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849 views

### The process of burning and increasing weight

I saw a movie in which an object (a kind of steel wool in kitchens) was burning on the kitchen scale. When the burning process began, the weight of the object began to increase. Can anyone explain the ...
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1 vote
52 views

### High school experiments recommendations

I am from India and you know teachers don't show the experiments and they only give the theory but I want to see experiments video at least so I'm satisfied that physics is correct , can you tell me ...
647 views

### What is a simple way to slow down this cart? [closed]

What can I do to slow the wheels down and make this 4 wheel cart harder to push? I'd prefer a fairly straight forward solution. It will be used for exercise. I am very naïve when it comes to physics.
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### Is there an equation I can use to link the length of a guitar/violin string to the sustain time of that string after being plucked?

Sustain time: the length of time the string vibrates and the sound can be heard after being plucked. I'm looking for a relationship between the variables in order to construct a graph for a link ...
144 views

### How can I pluck a string of a guitar with a constant force?

I'm trying to perform an experiment but need ideas on how to pluck a string with a constant force using household objects/equipment.
for an optics experiment I had to design a $2$-lens system to image a grating, the diagram looks like this: The focal length of both lenses is $15$cm, at the end of the system there's a camera ...