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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.

4
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3answers
67 views

Is this can be considered as the Newton's ring?

It can be made by pointing a laser pointer directly to a mirror at low angle and observing the reflection behind the laser pointer. No convex or concave lens needed unlike the Newton's ring experiment ...
0
votes
1answer
34 views

How to calculate total power generated?

I have a circuit with a piezoelectric transducer which converts mechanical energy to electrical. The ceramic is connected to a 1 Megaohm resistor and a voltmeter which reads voltage. If I want to ...
0
votes
2answers
53 views

Why do popcorns sizzle after popping?

Why do popcorns make a sizzling sound after popping? At first I thought it might be due to moisture, but according to this, that is not the case, as the water present in the corn has already ...
1
vote
0answers
19 views

What are the dynamics of a rope wrapping around a pole of given radius?

Suppose we drop a mass m from an initial angle $\theta_o$ connected to the pole of radius r with a rope of initial length $l_o$. As the system is released, the rope wraps around the pole, decreasing ...
0
votes
1answer
41 views

Upside down water cup trick [closed]

I've been thinking about how this upside down water trick, you fill the cup with water to the brim and place a card on top then flip the water and card do not move. how is this used in everyday life? ...
4
votes
2answers
77 views

Why do I get static shock due to wool, but not due to cotton?

I have experienced electrostatic shock quite a lot of times due to woollen fiber, and as far as I can remember, never due to a cotton fiber. Any explanation as to why this happens? Edit I ...
0
votes
1answer
23 views

Friction Behavior at corners

The question: Find the range of value of $L/D$ such that the system remains in static equilibrium. And explain why such a range exists and not just a single value. This is the question where I ...
0
votes
1answer
379 views

Fusion confusion: what did 12 year old Jackson Oswalt do?

This kid has been showing up in news feeds, but only credulous pop media articles, not hard science reporting. What did he build, and what physics does his device do?
0
votes
1answer
43 views

Why are there less bubbles the second time I pour soda in the cup?

I poured some Pepsi into a mug, and it foamed, and I poured until the foam was at the top of the glass. I waited a few seconds for the bubbles to go, and the liquid level was revealed to be at around ...
3
votes
3answers
76 views

Why is blowing so different than sucking? [duplicate]

Why is it so easy to blow out a candle from a significant distance, but nearly impossible to suck enough air to do the same? Even without focusing the airflow through a nozzle or something, this ...
2
votes
1answer
24 views

Why does spinning a cylinder result in a spherical image?

I was spinning a cylindrical bottle of superglue, and a sphere formed in the middle until the bottle stopped again. Why is this?
1
vote
1answer
70 views

I have a pair of magnets that when I let go they attracted and broke

I let two magnets attract from a distance and when they hit they both broke a piece off of each-other. Why did the magnets damage each-other when they collided and is it possible to put the broken ...
1
vote
2answers
55 views

Car headlight voltage

If I put a higher voltage bulb in my car headlight, what will happen? I haven't tried it yet, but I'm wondering if it would matter. The bulb has the same wattage but a different voltage.
8
votes
3answers
468 views

Why does sound behave differently in water than in air?

I noticed in some experiments at home that sound does not behave the same in water than in air. Is there a good scientific explanation to this? I noticed that the sound sounded distorted in water but ...
0
votes
2answers
103 views

What is the purpose of the slit in a spectroscope?

I built a spectroscope using a CD as diffraction grating. I understood how the grating works, but I didn't get why the slit is essential. Shouldn't it work even without the slit?
0
votes
0answers
17 views

What's the best way to plot different data sets that start at different values?

I have data for the surface temperature of two different aluminum blocks, one thicker than the other. I want to show the temperature change of the two data sets (with respect to time), but the problem ...
0
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0answers
28 views

Measuring Impact Force

My daughter is doing a project for school measuring the difference in impact force in softball with a mask vs without a mask. The systems I've looking into purchasing cost $1000. Please advise on how ...
33
votes
11answers
7k views

Are there physical properties that can be used to differentiate stainless steel from copper in a home environment? [closed]

So the backstory is that I purchased a reusable drinking straw that is copper coloured, but is advertised to be stainless steel. That got me thinking about whether I could be sure it was one or the ...
5
votes
1answer
398 views

Why do two like poles stick together when one magnet is stronger than the other?

I have two magnets, a weak one and a very strong one. The weak one is a cheap toy magnet, and the strong one is a ceramic magnet. Normally, I would expect that if I orient the magnets so that the two ...
0
votes
2answers
77 views

$V = 4 volts$ but $I = 0$

Recently in my school, I tried to generate electricity from plants in a flower pot with copper and Zinc electrodes. The Potential difference in the voltmeter read 2 to 3 volts but when I connected the ...
2
votes
2answers
76 views

Did diffraction bend this light more than 90 degrees?

Earlier I asked whether diffraction could bend light more than 90 degrees. earlier question Lambda gave me an answer. He stuck a razor blade into a piece of wood, and he shone a green laser at it, ...
0
votes
1answer
64 views

Simple experiment proving air pressure is stronger than water pressure at sea level [closed]

I conducted a simple experiment I: pour a little of water into a cup, put a card on top & turn all upside down. The card does not fall $\Rightarrow$ $$P_i + P_w < P_o\tag{1}$$ $P_i$ : air ...
1
vote
1answer
52 views

Time taken by a Magnifying Glass to heat Metal [closed]

I would like to know how long would it take for a small or medium sized mag. glass to heat a black painted metal particularly aluminum since I can't do the maths.
5
votes
3answers
55 views

Common microwave absorbing substances

I'm looking to demonstrate to class of students how microwave absorption works, but I need something relatively common which I can easily make into a board. Does anyone have any suggestions for ...
1
vote
1answer
57 views

Diffraction using a phone

I used my phone to create a diffraction pattern and measure the number of pixels along the horizontal. I used the formula in the picture and calculated everything using readings ive added in the ...
2
votes
3answers
64 views

Is it possible to suggest a physical experiment in which measurement errors are dramatically increasing? (due to the accumulation of errors)

Is it possible to suggest a physical experiment in which measurement errors are dramatically increasing? (due to the accumulation of errors) Maybe some magnetic field can be used here? Or any other ...
1
vote
1answer
30 views

How do I experimentally measure the resistance from using dielectric grease on battery posts?

The internet gives lots of contradicting advise about greasing or not greasing car battery posts to prevent corrosion. So rather than rely on the internet, I want to perform an experiment so that I ...
1
vote
1answer
44 views

Can Fresnel zone plates be used as collimators

I quite often use the principle in physics that (outside of thermodynamics), all laws of physics are time-reversible. And so, when looking at collimating microwave light, I though that it might be ...
0
votes
2answers
35 views

Experiments using cheap, low-power radio

In lecture, I've been using an expensive (\$2000) 10 GHz microwave demo setup consisting of a transmitter and a receiver. It can be used to demonstrate things like the transverse polarization of ...
2
votes
1answer
27 views

At Home Experiment Shows Permanent Magnetic Field Does Not Refract

For an at home experiment I positioned a magnetic field so it would cross a boundary from air into water. I wanted to see if it would experience refraction similar to the refraction seen in ...
2
votes
2answers
113 views

Why the rubber ball bounced higher than the glass ball

For a teaching degree we did the following experiment: Drop a rubber and a glass ball of approx. same size from approx. same height onto laminate flooring. As we expected, the rubber ball bounced ...
0
votes
1answer
27 views

Dynamic friction

In my house, we are debating whether when you scrub the floor it is easier or more difficult to drag a piece of furniture. My floor is made of marble, who's right?
0
votes
1answer
31 views

How to maximize the efficiency of a portable air conditioner? [closed]

I have a small window AC unit that I occasionally use to rapidly cool my apartment. As I was placing it in my window today I was thinking of how I could maximize it's efficiency so that it either ...
2
votes
2answers
132 views

What’s wrong with my cloud chamber setup?

For my setup, I am using a fish tank, lined with black felt and with one side open for viewing and a slit on a side for the light. I have a pretty bright multi led flashlight. I am using dry ice ...
-2
votes
1answer
118 views

If we have density and mass why should we have gravity?

In a cup filled with different solutions with different densities if we put objects of different masses they will sink to different layers ... and this can be explained by mass and density so what is ...
0
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0answers
47 views

Sequential Stern-Gerlach experiment on a budget

The sequential Stern-Gerlach experiment is important for historical and theoretical reasons; it demonstrates in a conceptually simple manner the consequence of having non-commuting observables with ...
0
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0answers
83 views

Why do we blow on the “hurricane balls” only after they begin spinning?

In the hurricane balls phenomenon, we have 2 balls welded together and by spinning them first by hand on the smooth tabletop, we are then able to accelerate it by blowing a through a nozzle at the ...
1
vote
1answer
66 views

Can I trap mosquitos with Coulomb's force? [closed]

Can I fill a metallic conductor with a very large positive charge, attach it with a insulator to a wall, put it near a window under the sun (visible light and UV in order to cause it to expell ...
3
votes
0answers
25 views

Surface fluctuations in the combustion of ethanol in a woosh bottle

A whoosh bottle demonstration typically involves igniting ethanol vapor in a large bottle with a narrow opening. The rapidly expanding gas creates the whooshing noise as it vacates the container. This ...
0
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0answers
15 views

Advice on debugging ultrasound standing wave setup

I'm trying to set up an ultrasonic standing wave powerful enough to levitate polystyrene - on a budget (i.e. nothing's quite what I'd like it to be ;)). I have not yet successfully demonstrated a ...
0
votes
1answer
44 views

Detecting Earth’s Changing Speed Will My Idea Work?

Is there a way to detect the earth’s changing speed as it orbits the sun? I’m thinking of an at home experiment. It would be a plumb bob suspended in a tube about ten feet in length. There would be a ...
1
vote
1answer
58 views

Electromagnet works on and off

I'm working on an small electromagnetic motor and made one of the coils for it to test. The black spool is 3D printed (so maybe my problem is that I don't have the coil wrapped around a ferromagnetic ...
5
votes
1answer
145 views

Why does not a bubble in a thick hand sanitiser not rise?

Here is a picture of a bubble trapped inside a thick hand sanitiser. These bubbles never rise despite not sticking to the walls! They just remain stationary, in the middle of the liquid, despite the ...
3
votes
0answers
59 views

Why does bread sticks on a hot pan? [closed]

What causes a slice of bread when placed on a non stick (hot) pan without much oil/butter to stick to it. And why does it not in presence of butter or oil ?
2
votes
0answers
42 views

How much electricity does it take to create hydrogen from water depending on the water's pressure?

Imagine creating bubbles of hydrogen and oxygen underwater at a particular depth using electricity. Then reusing the energy of the bubbles going upward to the surface ( buoyancy ). How is the energy ...
1
vote
1answer
41 views

Multilateration of Sound in 3D Space

TL:DR - How can you find the 3D coordinates of a emitter than transmits an impulse signal? STORY: I'm working on something to improve my bird-watching. I've got a camera that can take pictures of ...
0
votes
0answers
23 views

What is the proportionality between volume and momentum passed on in a collision?

I am designing a simple experiment with a setup as follows Simply put, I am rolling a marble into a light plastic bucket (cup) and seeing how far it swings in a ballistic pendulum. I can get the ...
1
vote
3answers
98 views

What is an experiment to teach my daughter about steam (water) pressure?

On a recent steam train trip my daughter said to me: Daddy, I'd like to pull that steam engine apart and see how it works. Now there are two parts to her question - and I'm only make this physics ...
1
vote
3answers
96 views

Why do really cold objects evaporate really quick? [closed]

So I saw a video of LNG (liquid natural gas) and when it got in contact with water, which was room temp the LNG evaporated instantly...why? Ice takes a while to evaporate like a sec even when hot ...
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0answers
22 views

How does a blender manage to mill kiwi seeds in a smoothie?

I'd think, in a blend of kiwi, apple and banana and little bit orange juice kiwi seeds would rotate with the blender's knife, but they get milled. Why is that?