Questions tagged [everyday-life]

Concerns the application of the laws of physics to analyze common situations encountered in everyday life.

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1answer
102 views

Can physics help in choosing watermelons? [closed]

Just a lighthearted question for the summer :) I was at the supermarket the other day, and I wanted to buy a watermelon; great straight out of the fridge, to chill and rehydrate in this sweltering hot ...
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3answers
118 views

Why is rainfall uniform even though clouds exist in lumps? [closed]

Since clouds exist in lumps and are non-uniformly distributed, one would expect rainfall to be non-uniform as well. But as far as I can tell, rainfall is more or less uniform over a large region. I ...
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1answer
79 views

What is physics behind counter-steering?

What is physics behind counter-steering? When we drive bike, in order to achieve a sudden left turn, we turn the handlebars quickly to the right, and vice-versa. What is the physics behind it.
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0answers
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What wears out a rubber sole of a shoe faster - sliding against dry or wet clay?

This question arises from my daily experience as a tennis player. I'm a novice to tribology. I couldn't quite come up with anything to answer that question. Any help? I know for certain that the ...
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1answer
35 views

Is it dangerous or safe to use a black/dark cloth cover on a propane tank? [closed]

Say I have a standard 20lb propane tank. I want to put a protective cover over it, to shelter it from weather. Can I use a cover that is black or dark colored? Is that dangerous or will it put me at ...
2
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1answer
17 views

Can atmospheric humidity act as a cloud chamber?

According to wikipedia vapor supersaturation is relatively common (20-40% of the time) in the upper troposphere. Assuming perfect conditions (such as sufficient visual contrast and no wind), would it ...
4
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3answers
118 views

Which Method is better to avoid Road Accident? [closed]

If I am driving at night and fall asleep, and when I wake up I see a wall in front of me. What should my instincts be : Should I just apply brakes? Or should I apply brakes and try to turn the car ...
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2answers
2k views

Will cutting sand paper with scissors make the scissors sharper or duller?

This is a little question that I have been wondering when I need to cut sand paper with scissors. Sand paper can be used to sharpen knives etc. when applied parallel with the blade surface. Also it ...
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Stability of a System - conducting Rod and coin magnet

I recently observed an interesting behavior when a coin magnet is placed on a conducting iron rod. When the symmetry axis (cylinder symmetry) of the rod and the coin magnet align the system seems to ...
2
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1answer
43 views

What is the reactionary force exerted on a swing?

On a playground swing, children quickly learn how to swing higher and higher by timing their body motions with the resonant frequency of the swingset. But it occurs to me that it seems you're making ...
2
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4answers
114 views

How do we get energy to start walking?

The answer seems obvious, it's our energy that gets converted into kinetic energy. But my question is how exactly? Which force is responsible for doing work on us so that we gain kinetic energy? It ...
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4answers
146 views

Energy-optimal beer cooling

Suppose that I am going to host a big party one month from now, and I have various liters of cold beverages that will need to be refrigerated by the time of the party. I have a fridge at home (which ...
2
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1answer
35 views

Bubbles on the surface of tea after using a teabag

What are those bubbles/lines on the surface of my (clean) teacup after making tea with a tea bag (seethrough paper kind, wrapped in paper)? I used a kettle. The water is clean. Also what determines ...
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9answers
669 views

Are there any quantum effects which we can see in every day life? [closed]

I am wondering if there are any natural phenomenon in every-day life that cannot be explained by classical physics but can only be explained by quantum mechanics. By classical physics, I mean ...
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2answers
49 views

Trajectory of hitting stump by swinging the ball

If we want to hit a target by a stone or missile we have to consider and calculate the interaction of the surroundings with the thrown object precisely. Can you show a mathematical model or trajectory ...
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3answers
3k views

Why does glass, in spite of being amorphous, often break along very smooth surfaces?

When a crystalline material breaks, it often does so along planes in its crystalline structure. As such this is a result of its microscopic structure. When glass breaks however, the shapes along which ...
4
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3answers
79 views

Why does driving a screw in spurts work better?

When you drive screws into wood with a driver or drill, it is often the case that mid-way through the process the screw will suddenly bind and eject your bit (assuming it's not a Robertson or Torx). ...
0
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1answer
46 views

Why is desaturated orange = brown, but desaturated blue is just plain blue? [duplicate]

As per wikipedia, "brown" refers to long wavelength hues, yellow, orange, or red, in combination with low luminance or saturation. So what about the short wavelength hues? Is there any ...
2
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2answers
67 views

Why does water keep dripping out of the bucket even after the faucet is turned off?

So I just noticed that when I filled my bucket with water until it overflowed and then I turned the faucet off, the water kept dripping for like 20 seconds. Why does this happens? Shouldn't it have ...
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0answers
25 views

“Cooling down” a column thermometer

Typical medical thermometers based on a capillary mercury or fluid column expansion usually require employing centrifugal/acceleration methods to drive the fluid back to the bulb after performing a ...
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2answers
35 views

Propagation of rate of fluid flow in a home

Suppose I have a large home with two windows. Assume the home forms a perfect seal and does not leak fluid other than from open windows. The window in the bottom of the home is open. The window on the ...
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2answers
70 views

Why does ground reaction force decrease at the start of a vertical jump?

I don't understand why reaction force would decrease at the start of a countermovement jump. I've tried looking at this diagram and considering moments and how lowering the position of the center of ...
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2answers
36 views

Working of a desert cooler?

Does level of water have any effect of the capacity of cooling in a desert cooler ? The fan rotate with a constant angular velocity so how and why does the water level effect the coolness capacity ...
0
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1answer
38 views

Why does a bike skids on the sand?

Whats the theory behind bike skidding on the sand? Is it related to friction and if then why it skids. Is that the sand has more friction if so then pedaling should be difficult rather than skidding.
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2answers
51 views

Is it dangerous to put a pressure cooker under cold water after cooking?

After cooking using a pressure cooker, it usually takes a while for the pressure to be released and for the cooker to be opened. However when I think the food may have been slightly overcooked, I take ...
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2answers
112 views

What actually causes even slow walking sounds from the upper floor to be heard?

I'm not sure where else to ask this question but I thought this might be sort of a relevant place. It's a question that's bothering me for a long long time. I'm staying in an apartment where there's a ...
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3answers
75 views

Moving with constant velocity in presence of net force

If I neglect air resistance is it possible that I can walk with constant velocity? Suppose that I take equal steps of equal length every second and therefore my velocity doesn't change. That means ...
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2answers
71 views

Why does sound travel slower through solid than through air here?

We know sound travels faster through solids than through air. Now consider this: Perhaps two people A & B are standing in two adjacent rooms both of which are closed from all sides. Let distance ...
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1answer
46 views

Why do doors and windows automatically open during windy season?

Suppose air is flowing from west to east and door is facing north . Now, i know using Bernoulli's equation the air outside is flowing at higher speed when compared to air inside which creates a ...
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3answers
367 views

Why does it take different levels of effort to lift two objects with the same mass?

Suppose we have two different objects, one denser than the other. In short, what I mean is that one object is bigger than the other but they have the same mass. Now why does it take different efforts ...
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1answer
55 views

Can a fan in a room cool down objects?

Does a fan cool objects? I have a ceiling fan in my office which really helps to keeps the room cool. Does it also cool down vitamins in a plastic bottle with a screw on top? My office can get very ...
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0answers
54 views

At what slope angle does walking uphill become more energy-efficient than cycling?

At what angle does walking uphill become more energy-efficient than cycling? To me cycling uphill feels harder than walking uphill, so I wonder at what slope-angle this happens. Two other ways to put ...
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1answer
40 views

Why does water spread when thrown?

I have noticed that when you throw a bucket of water (or any other liquid), it spreads out. Why does it not stay clumped together like a ball or the shape of the container it was thrown from?
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1answer
82 views

Why does the glass move?

I have observed at my home that when there is a small puddle of water on a glass table and an inverted steel glass is kept on that puddle of water, the glass starts moving on its own after some time. ...
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2answers
48 views

Liquid can lift a small piece of paper?

Imagine you have a small piece of paper in your hand. Your hands are sweaty and due to perspiration, the paper kind of bends up. Can you explain what is happening? Is it the capillary forces?
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1answer
35 views

Why does hair dry faster when I have less hair?

I recently had a haircut, and have noticed that water in my air dries up faster when I short hair. I assume that hair loses water due to evaporation. We have been taught that evaporation is faster ...
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3answers
2k views

Why do objects with big size break easily?

Why do objects with big size break easily? For example: if I drop a chalk of length $L$ from height $h$ then there is a greater probability that it might break, when compared it to a chalk of length $\...
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0answers
21 views

Why does the pitch of an ice cube hitting against the side of a glass increase as the glass empties? [duplicate]

When dropping several ice cubes into a full glass of water, I've noticed that the pitch of the cubes hitting against the side of the glass is much lower than if the glass contains less water - the ...
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3answers
61 views

Are falling objects harder to push compared to objects at rest

While an object is still in the air falling under the influence of gravity, does it take greater force to push or steer it to the side compared to when the object is in a state of rest?
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1answer
81 views

Why does bottle with long straw get emptied first?

Two identical bottles with different straw length are filled with identical liquids (obviously up to the same height as depicted in the picture). Bottle with long straw is emptied first.What can be it'...
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1answer
24 views

In which household equipment can i find an alternator or a generator or a dynamo (about 17V)? [closed]

equipment required: dynamo or an alternator or generator (all should be small about 17V). As due to COVID19 i am unable to buy any of the mentioned equipment as the online shopping service providers ...
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2answers
68 views

Teaching Electromagetism to Life-Science Students

I am going to be teaching an introductory university class on E&M and Modern Physics (from Coulomb's Law through Maxwell's Equations and optics, followed by a brief mention of quantum and ...
5
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2answers
131 views

Cooling behaviour of beverage

I offer my colleague some milk in her coffee. The milk has just come out of the fridge. "Not now," she says. "Not till after I've finished my sandwich, and I don't want it to go cold." So: identical ...
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1answer
31 views

Weight is storage for energy, right?

Since weight is storage for energy, the light vehicle will have a slight advantage on the flat ground due to low stress applied on wheels meaning less friction pulling the vehicle back. When though, ...
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1answer
39 views

Has physics ever tried to explain how do we get “sensorial experiences”? [closed]

To be clear about what I mean with "sensorial experiences", let's take for example our visual experiences. Certainly, physics (and other sciences) explains a whole process which involves light ...
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4answers
6k views

Why are steel thermal mugs much better than plastic ones?

I have several thermal mugs, two of them by the same brand, have the same look, shape and size except that one is in steel (inside and outside) and the other one, plastic. Both have an insulating ...
12
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4answers
2k views

Why would frozen sausages defrost faster in water?

My mom uses frozen sausages for a soup. She defrosts frozen sausages by submerging them in water (room temperature I believe). She claims this makes them defrost faster. She learned this from some ...
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1answer
50 views

How can the water droplets form on the top of the plastic bottle?

After I was drinking water in school, I flipped top-to-bottom the bottle. At that time, I was wondering how it is possible to form the water droplets on top of the bottle; inside the bottle. I ...
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2answers
51 views

Dispute over the movement of hot air and cold air [closed]

My neighbour and I share a small window at the end of the corridor in the block of flats where we live. She often wants to close this window leaving notes on the window saying: "You (me) are ...
3
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1answer
51 views

Does Bernoulli's equation describe why my curtains stick to the mesh?

I was sitting right in front of a big window (with a mesh) with curtains open, suddenly wind swooshes in, curtains sway forth and back. While they sway backward, they stick to the window(mesh) as if ...

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