Definition of non-touch force and examples – Does Readers still remember the material about touch and non-touch force? Yep, that is physics material at the elementary and junior high school levels. At that school level, the discussion of touch and non-touch styles is really just the basics.
When Readers moved the chair, did he realize that at that time we were exerting a force on the chair?
Yep, a push or a pull that can cause inanimate objects around to move or move. Well, because there is a non-contact force, it means that there is also a touch force.
Apart from moving chairs, what else is an example of this non-touch force? Come on, see the following reviews!
Definition of Non-Touch Force
The non-contact force is a force that will work even though there is no touch to the object being addressed. In this case, the force released by the force source can still be “felt” by the object, even though the two are not in direct contact.
So, it can be said that objects can move or get the influence of a force even without human touch or a source of force. Some types of non-contact forces include gravitational forces, electric forces, and magnetic forces.
This non-touch force is of course different from the touch force, the difference lies in the “touch” given by the source of the force to the object being addressed. However, even though this non-contact force does not get a direct touch from the source, objects can still move. In conclusion, this non-contact force requires other means so that the object can move.
Gravity
The gravitational force is one type of non-contact force. In this gravitational force, all the particles in an object (which has mass) will appear attractive forces. This gravitational force is the source of the force not from humans, but from the sun or the earth.
An example is the force of gravity that comes from the earth. Planet Earth has a very large mass, so it produces a large gravitational force to be able to attract objects around it. These objects are the moon, meteors, to man-made satellites.
Even though planet Earth has a large gravitational force, the center of the universe is the sun. Therefore, the gravitational force on the sun causes the position of the planets around it to always be in accordance with the orbits and together around the sun as its axis.
Meanwhile, the gravitational force of the earth is not only on objects around it, but also living things and objects on planet earth. This gravitational force was proposed by Newton.
Earth’s Gravity
Previously, it was discussed that the gravitational force on the earth is not the greatest gravitational force, because the sun is the center of the solar system. So it can be said that planet Earth also “follows” the gravitational force of the sun.
Then, what about humans and objects on earth, do they follow the sun’s gravitational force? Of course not. Humans and objects that are around it follow the force of gravity of the earth.
Around 1687, a physicist as well as a mathematician, astronomer, chemist, philosopher and theologian, namely Sir Isaac Newton put forward the law of universal gravitation. The results of the idea were written in a journal entitled Philosophiae Naturalis Principia Mathematica and described the force of gravity in human everyday life.
In this idea, Newton stated that the fall of every object comes from the pull of the earth, with the following formula:
Why is there a formula? Of course there is, because the force of falling objects due to the pull of the earth can be calculated using a certain formula. Based on this formula, it is described as follows:
F = the magnitude of the gravitational force between the two masses
G = gravitational constant
m1 = mass of the first object
m2 = mass of the second object
r = distance between the two masses
A simple example to prove whether the earth’s gravitational force really exists is the fall of objects from top to bottom. Try throwing the ball up, of course the ball will come back down. If the ball bounces, it will definitely move from top to bottom.
It is the gravitational force that causes you, the people, your house, bridges, and all other objects on planet Earth to remain in a stable position and not scatter or float in the air.
Electric Force
Electric force is a force generated by electric charges, so that it can indirectly move objects. In the electric force, there is an attractive or repulsive force that arises from two objects with electrons.
On average, all objects around us have an electric charge or electrons, even if it’s water. There are two types of electric charge in an object, namely positive charge and negative charge.
Meanwhile, there are two types of electric forces, namely static electric forces and dynamic electric forces. An example of static electricity is a simple experiment between a scrap of paper and a plastic ruler.
If you’re curious, experiment with small scraps of paper and a plastic ruler. The plastic ruler is rubbed on the hair first, then stick it on the scrap of paper. Then the two will attract each other.
This happens because hair, especially when it is dry, has an excess of electrons. In the electric force, it is usually denoted by the letter F.
Static Electric Force
Static electricity is a term for a collection of electric charges that have a fixed or static amount, causing an imbalance of electric charges in or on the surface of an object.
An example of an experiment to prove the existence of static electricity is an experiment between small pieces of paper with a plastic ruler. When we rub a plastic ruler on our hair, the ruler becomes negatively charged, while the hair becomes positively charged. Now, when the two of them are brought together by rubbing them, it will make the materials release their charge until finally they are electrified or charged.
Dynamic Electric Force
In contrast to static electricity, this dynamic electric force has a moving electric source, namely direct current and alternating electric current. The use of this dynamic electric force is usually electronic goods that require electricity to flow through cables.
Electric field
The electric field is an area or room that is around electrically charged objects, so that these objects will feel or experience an electric force. The direction in the electric field varies.
The strength of the electric quantity on objects that are in an electric field depends on the magnitude of the Coulomb force per unit charge at a point.
Magnetic Force
Magnetism is the force of attraction or repulsion on magnetic objects. These objects usually occur in metal or iron objects. There are magnetic properties in an object that are obtained naturally and there are also those that must be deliberately made by humans, so that they become artificial magnets.
Every object around it basically has a small magnetic element called an elementary magnet. However, not all of these elementary elements are arranged in an orderly manner, there are also non-magnetic objects whose elementary magnetic directions are irregular.
This magnetic force is almost the same as the electric force due to the mutual attraction or pushing between the two objects.
Each magnet generally has two poles, namely the north pole and the south pole. For example, if you take a permanent magnet and cut it into smaller pieces, you will still get parts of the north pole and south pole, because the elementary magnetic elements are arranged in an orderly manner. Magnets also have certain properties, namely:
- Magnetic poles of the same kind (the north pole with the north pole; or the south pole with the south pole) then the two will repel each other.
- Magnetic poles are not the same (north pole and south pole) then the two will attract each other.
Magnetic field
The electric field is the area, area, or space around a magnet, where other magnets or other objects get magnetic influence so that they experience a magnetic force. Almost the same as the electric field huh…
The magnetic force that exists in this magnetic field when described, seems to have lines, which are as follows:
- Magnetic lines of force will always come out from the north pole to the south pole on a magnet.
- The density of lines of force per unit area that exists at a point, illustrates the strength of the magnetic field at that point.
- The greatest density of force lines can be observed at the magnetic poles. Therefore, the magnetic field is strongest in the polar regions.
- The farther from the poles, the smaller the density of the lines of force. This proves that the further away from the poles, the weaker the magnetic field will be.
Did Readers know that in the magnetic force there is an electric charge? Yep, in a magnetic field there are moving electric charges, called the Lorentz force. From this event, of course, it is used by humans for their daily needs.
Examples of Touchless Style in Everyday Life
Gravity
- Objects thrown up, will always fall downwards
- Humans can sleep on a bed quietly, not floating in the air (like in outer space, because there is no gravitational force)
- Humans can stand upright on the surface of the earth
- Means of transportation can walk upright on the surface of the earth, not hovering in the air (stable)
- Houses, bridges and buildings can stand upright and stably
- Slide game rides
- The planets in outer space rotate on their axis. If there were no gravitational force, the planets would be unstable and collide with each other.
- The fruit falls from the tree
- Drinking water is poured from the teapot
- Rainwater from the atmosphere falls downwards
- Tidal events
- Play basketball, volleyball and tennis
- The aircraft can be in the air and descend to the surface in a stable manner
- Tap water always falls downwards
Electric Force
- Got electric shock
- Lightning when it rains
- Use of batteries and lights
- Rub a plastic ruler on the hair and then bring it closer to the small pieces of paper
- Turn on the refrigerator, tv and other electronic equipment
- A plastic ruler is rubbed against a woolen cloth
- Sparks on vehicle tires, while on the highway
- Turn on the electric drill
- Use of photocopiers
- Charge cell phones and laptops
- Use of spray paint
- Use of laser printers
Magnetic Force
- The use of magnets on the refrigerator door, which allows the door and refrigerator body to stick together and then close tightly
- Use of magnets on microphones
- The use of magnets in loudspeakers on televisions, earphones or smartphones
- Electric motor
- Compass equipment
- Cars lifting junk and nails on the highway
- Metal Detector, to detect the presence of metal underground
- Turtle migration
- Magnets for notes on the fridge
- Magnets to stick the paper on the board
- Bird migration
- Darts game
Well, that’s an explanation of the non-touch force and examples in everyday life. Maybe we are not aware of the existence of some types of non-touch force, even though in fact it has great benefits for our daily life.