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Scientific Method
The scientific method is the basis of scientific investigation. A scientist will pose a question and formulate a hypothesis as a potential explanation or answer to the question. The hypothesis will be tested through a series of experiments. The results of the experiments will either prove or disprove the hypothesis. This category should contain questions and answers regarding the scientific method.
4,392 Questions
What is a catchy title for a science project about sports balls?
"Bouncing into Science: Investigating the Physics of Sports Balls"
What is a scientific endeavor?
A "scientific endeavor" is simply an experimental process or investigation. This could include collecting data, observing a natural process, or analyzing the results of an event or other activity.
An "endeavor" could be any of innumerable projects, such as discovering a new building material, locating gravitational anomalies, or examining astronomical photographs.
Will static electricity and your hair make energy?
As name imply static electricity is a static accumulation or depletion of electrons, meaning the electrons don't move, so no current is produced, only an electrostatic field. Static electricity appears when a mechanical cause changes the location of the electrons (maybe even remove them from where they are), and the condition is that these electrons cannot come back to where they were (said otherwise the material used must be an insulator). At the atomic level this cause has created ions which are atoms with more or less electrons in their cloud than the number of protons in their nucleus.
To create electrical energy from this situation we need to create a current, which is a flow of electrons. To do that we will connect together a region with depletion of electrons to a region with excess of electrons (compared to the number of protons). Doing that we'll transform potential energy into kinetic energy. The kinetic energy that will be created by this transformation is proportional to the number of electrons to move until some balance is found (electrons are balanced over all atoms, there is no difference of potential). Note that this doesn't mean the ions will disappear and the number of electrons will be the same than the number of protons. Just there will be the same excess everywhere, or the same depletion everywhere.
From the definition of the volt, we can compute the number of joules created, and this number is the energy.
We'll obtain something like a few microjoules. That's energy but that's not much! To lighten up a light of 1 watt during 1 seconde, we already need 1 joule.
A usual misunderstanding is that the difference of potential created by the static electricity can be very important. But you need to think of that like water in a dam. We indeed create energy from this water by changing its height from the dam to somewhere below in the valley. The more the height of the water, the most the energy we can produce (transform...). But what about a single drop of water at 1.000 meters above the ground? It won't produce any energy when reaching the turbine of the dam.
This is the same for electricity, the potential is the height of the water, and the number of electrons is the number of water drops in the reservoir. With static electricity we have a few drops at very high height, and in the end this doesn't produce much energy.
What about the potential (voltage) of the static electricity? This is simple to understand.
Electrons are moved by some cause so that they are not anymore well distributed in space, there is an area where they lack (positive ions), and another were they are to many (negative ions). They lay on a material not conductive of electrons (an insulator). So said otherwise: for the electrons to redistributed themselves correctly, they need to move thru the insulator or thru the air, from where they are too many to were there are too few. Why would they do that? Because of the electrostatic field created by this unbalance. If we increase the level of unbalance (by adding or removing electrons at some location), we increase the electrostatic field. At some point in time the insulator or the air won't be able to counter this force and the electrons will start to move. This move will be difficult because the insulator (the air too, it is also an insulator) offers a large resistance to electronic move (which is another name for electrical current) by definition. This will create heat in the insulator. Very large heat. This heat will in turn change the nature of the insulator by creating ions in the insulator (said otherwise by moving electrons belonging to the insulator atoms). But ions actually conduct electricity (also by definition), so this will ease the work of electrons to find their way in the insulator, which is no more an insulator in this small area where the ions have been created... More electrons will move, and this will create more heat and more ions. Etc. As soon as the phenomenon is started it will continue and the result is that a very high number of electrons will move in the insulator creating a very hot channel.
What was described above it just what we call an electric arc...! This is why you see (in the night) or hear sparks when you brush your hair. You are just creating arcs at very hot temperature locally, and the light is just a tube of atoms that have been ionized at a point that they become plasma. Plasma, the forth state of the matter like in the stars, just in your hair.
What we know by test in laboratory is that in dry air, we need a difference of potential of 4.000 V to create an arc between areas at a distance of 1 cm. So to create an arc of 1 mm we need at least 400 V. Look at the length of the arcs in your hair and calculate the difference of potential needed to create it in dry air.
Why is an oar a second class lever Giving reasons?
The answer is that it is NOT.
It is a first class lever.
"Class 1: the fulcrum is located between the applied force and the load. Example: the crowbar" - Wikipedia
In regular use, the fulcrum of the oar is attached to the top side or edge of the water craft, which is between the force being applied by the rower and the "load", being the resistance of the water itself.
This makes the oar a classic example of a first class lever.
What is the melting point for sulfite?
Sulfite is an organic compound with the chemical formula SO3 and a net charge of -2. It does not exist by itself but is usually found in the form of a salt, such as Na2SO3. The non ionic form, sulfur trioxide, has a melting point of 16. 9 degrees Celsius.
In an experiment the factor of interest is called?
The factor of interest in an experiment is called the independent variable. This is the variable that is manipulated by the researcher to determine its effect on the dependent variable.
What is the melting point for steam?
Steam does not have a melting point because it is the gaseous form of water. The melting point of water, which is the point at which solid ice turns into liquid water, is 0 degrees Celsius or 32 degrees Fahrenheit.
What is the difference between pinciple and law?
There can be errors in the execution of the Law but there can be no errors in the execution of the Principle. The Principle operates in ideal conditions.
In Principle the right triangle is 90 degrees; in practice you may never construct a right triangle of 90 degrees. The Principle of Conservation of Matter-Energy does not allow for missing matter-energy; The Law of Conservation of Matter-Energy allows for missing matter-energy if the missing part can be said to reside in error.
How can you demonstrate the force of gravity?
The force of gravity can be demonstrated by dropping an object from a height and observing it fall to the ground. Alternatively, one can use a pendulum to show the constant pull of gravity acting on the swinging object.
What energy transformations are in a vacuum cleaner?
First the electricity goes inside the vacuum cleaner, then the vacuum cleaner sucks the dirt right away so therefore:
Electrical energy -- Mechanical Energy
What color sunglass lenses blocks the most light?
the color of the lenses doesn't matter. It's the amount of protection on them. Often there is a sticker on the lens when you first buy the sunglasses that will tell you the amount of protection they offer. The higher percentage, the better!
How does Jane Goodall use the scientific method?
Jane Goodall uses the scientific method in her research by making observations of chimpanzee behavior in their natural habitat, forming hypotheses about why they behave a certain way, designing experiments to test these hypotheses, analyzing the results, and drawing conclusions based on evidence. She approaches her research with a systematic and objective approach to better understand chimpanzee behavior and their social structures.
Why will a pendulum eventually stop?
Energy will be lost, mainly through friction.
Energy will be lost, mainly through friction.
Energy will be lost, mainly through friction.
Energy will be lost, mainly through friction.
What are the ways of making a solar cell?
Solar cells are typically made using crystalline silicon, which involves growing, slicing, and doping silicon wafers into photovoltaic cells. Another method is thin-film solar cell production, which involves depositing layers of semiconductor materials onto a substrate. Both methods require precise manufacturing processes to create efficient solar cells for converting sunlight into electricity.
What are the results called in an scientific experiment?
The results of a scientific experiment are typically referred to as data or findings. These results provide the information needed to analyze the experiment's outcome and draw conclusions.
Why is air less dense at higher altitudes?
This is because of gravity. Air is not very heavy, but it does have a little bit of weight so is pulled downward toward the Earth. This makes the lower parts dense and the upper parts lighter.
What is the one variable that is purposely changed to test a hypothesis called?
The variable that is purposely changed to test a hypothesis is called the independent variable. This variable is manipulated or controlled by the researcher to observe its effect on the dependent variable, which is the outcome being measured.
Differentiate absorption method from colorimetric method?
Absorption method measures the amount of light absorbed by a sample at a specific wavelength, and is used to quantify the concentration of a substance. Colorimetric method utilizes color changes to detect the presence or concentration of a substance, often involving a chemical reaction that produces a color change.
What is the difference between discovery science and hypothesis based science?
the difference between discovery science and experimental science is. when we say "discovery science" is comes from the word itself "discovered" it is first discovered by a certain person. when we say "experimental" it comes from the word it self "experiment", people tried to make things that are new . :)
Which is the correct order of the steps involved in hearing an auditory message?
The correct order is sound waves entering the ear canal, then causing vibrations on the eardrum, which in turn moves the ossicles in the middle ear. The movement of the ossicles transfers the vibrations to the cochlea in the inner ear, where they are converted into electrical signals to be sent to the brain for processing.
The hypothesis of do all dishwashing liquids produce the same amount of bubbles?
The hypothesis would be: "All dishwashing liquids produce the same amount of bubbles." This hypothesis would need to be tested through a controlled experiment to determine its validity.
A net is necessary for an object to change its motion?
A net force is necessary for an object to change its motion, according to Newton's first law of motion. If the net force acting on an object is zero, the object will continue in its current state of motion (either at rest or moving at a constant velocity).
The info collected during an experiment is called?
The information collected during an experiment is called data. This data is used to analyze the results of the experiment and draw conclusions based on the findings.
The noble gases include:
Helium He
Neon Ne
Argon Ar
Krypton Kr
Xenon Xe
Radon Rn
The noble gases are very stable and do not like to make compounds with other elements. There are only a bit more than one hundred compounds of noble gases.
Name 2 factors the affect the distance taken for a toy car to stop after rolling down a ramp?
One factor is the height of the ramp. The higher the height of the ramp the further the car travels.
Another factor is the surface of the ramp. With a rough surface on the ramp e.g sand paper the car travels a short distance. With a lubricated surface on the ramp e.g Vaseline the car will travel a very long distance.
