# Write the Definition of Force with Examples

If all forces acting on an object are balanced, the net force acting on an object is zero. However, if all the forces acting on a body result in an unbalanced force, the unbalanced force can accelerate the body, which means that a net force acting on a body can change either the magnitude of its speed or the direction of its speed. For example, if many forces act on a body and the body is at rest, we can conclude that the net force acting on the body is zero. In science, the word „force” has a precise meaning. At this level, it is entirely appropriate to describe a force as a push or pull. Students should be encouraged to move from describing objects as „powerful” to using scientifically appropriate language. For example, students should be encouraged to say, „. the force of a magnet on a paper clip.” We can use the muscular power of animals such as oxen, horses and camels to carry out the activities. The frictional force is another type of contact force that acts between a pair of a surface in contact and tends to counteract the movement of one surface on the other. Galileo used experiments to show that when no external force acts on an object, it moves at a constant speed.

He observed that the speed of a ball increases when it rolls on an inclined plane due to its gravitational attraction. Newton`s laws of motion (1687) predicted the effect of forces both under normal conditions and in response to changes, thus laying the foundation for classical mechanics. Gravitational force Electric force Magnetic force Nuclear force Frictional force Free body diagrams can be used as a convenient way to track the forces acting on a system. Ideally, these plots are drawn while preserving the relative angles and sizes of the force vectors so that a graphical addition of vectors can be performed to determine the net force. [19] A simple case of dynamic equilibrium occurs in constant velocity motion on a kinetic friction surface. In such a situation, a force is applied in the direction of motion, while the kinetic frictional force is exactly opposite to the applied force. This results in zero net force, but since the object started at a non-zero speed, it continues to move at a non-zero speed. Aristotle misinterpreted this movement as caused by the force exerted. However, when kinetic friction is taken into account, it is clear that there is no net force causing movement at constant speed. [3] [4] The concept of force comes from Isaac Newton`s Three Laws of Motion. Force is defined as the „product of the mass and acceleration of a body” according to Newton`s second law.

In this article, we will learn more about the force formula with some practical questions. Newton`s second law can be used to measure the strength of forces. For example, knowing the masses of planets, as well as the accelerations of their orbits, allows scientists to calculate the gravitational forces on planets. Forces that act through spaces without coming into direct contact with the body are called non-contact forces. Forces can be classified as conservative or non-conservative. Conservative forces correspond to the gradient of a potential, unlike non-conservative forces. [3] [4] Gravity is responsible for the fall of the apple. Gravity is the gravitational pull between the Earth and an object. Electrostatic force: The electrostatic force acts between two charged bodies. It is very similar to the gravitational force, but the only difference is that the gravitational force acts between the masses while this force acts between the charged bodies. Example – On a friction scale on a wool cloth and take it near the pieces of paper, it will attract this paper. The flaws of Aristotelian physics were not completely corrected until the 17th century, when Galileo was influenced by the late medieval idea that objects in forced motion carried an innate force of momentum.

Galileo built an experiment in which rocks and cannonballs were both rolled down a slope to refute the Aristotelian theory of motion. He showed that bodies were accelerated by gravity to a measure independent of their mass, arguing that objects retain their velocity unless they are affected by a force, such as friction. [8] There are many definitions of force in physics. Force is nothing more than the interaction between two objects. For example, the frictional force acting on a ball rolling on the ground is in a direction opposite to the direction of movement of the ball. Other examples of contact forces are mechanical force, normal response, muscle strength, etc. A specific example of such a force associated with dynamic pressure is fluid resistance: a body force that resists the movement of an object through a liquid due to viscosity. In the so-called „Stokes resistance”, the force is approximately proportional to the velocity, but opposite in the direction: in special relativity, mass and energy are equivalent (as can be seen in the calculation of the work required to accelerate an object). As the speed of an object increases, so does its energy and therefore its mass equivalent (inertia). It therefore takes more force to accelerate it to the same extent as at a lower speed.

Newton`s Second Law The term „force” retains its meaning in quantum mechanics, although we are now dealing with operators instead of classical variables, and although physics is now described by Schrödinger`s equation instead of Newton`s equations. As a result, the results of a measurement are now sometimes „quantified”, that is, they appear in discrete portions. Of course, this is hard to imagine in the context of „forces.” However, potentials V(x,y,z) or fields, from which forces can usually be derived, are treated in the same way as classical position variables, i.e. V ( x , y , z ) → V ^ ( x ^ , y ^ , z ^ ) {displaystyle V(x,y,z)to {hat {V}}({hat {x}},{hat {y}},{hat {z}})}. The SI unit of force is the newton (N). Other units of force are the magnetic force: it is also a kind of non-contact force. The force between the iron and the magnet is the magnetic force, for example the magnetic poles in the DC motor. The weak force is due to the exchange of heavy W and Z bosons.

Its best-known effect is beta decay (of neutrons in atomic nuclei) and associated radioactivity. The word „weak” derives from the fact that the strength of the field is about 1013 times lower than that of the strong force. Nevertheless, it is stronger than gravity over short distances. A coherent electroweak theory has also been developed, showing that electromagnetic forces and the weak force are indistinguishable at temperatures above about 1015 Kelvin. Such temperatures have been studied in modern particle accelerators and reveal the conditions of the universe in the early moments of the Big Bang. The teacher should model the word „force” in the correct scientific sense and make it clear that the term has different meanings in everyday life. Force is a vector quantity, which means it has both sizes and direction. According to Newton`s second law, force is given as the „product of the mass and acceleration of a body”. Power, power, energy, strength could mean the ability to make an effort. Power may involve a latent or exercised physical, mental, or spiritual capacity to act or act. The enormous power of flowing hydropower implies the effective exercise of power.

Consumes enough energy to open the door, energy refers to the energy that is consumed or can be converted into work. A worker with unlimited energy power refers to the quality or quality of a person or thing that allows the exercise of strength or endurance from load, pressure or attack. Use strength training to build your strength, which involves great or overwhelming strength or strength. Newton`s contribution to the theory of gravity was to combine the motions of celestial bodies, which Aristotle had assumed to be in a natural state of constant motion, with the motions of falling on Earth. He proposed a law of gravity that could explain the celestial motions previously described by Kepler`s laws of planetary motion. [27] For example, when we push a chair, it moves remotely. So by pushing the chair, we exert force on the chair. When you kick a football, it starts to move. Here, when hitting football, we use violence.

Sir Isaac Newton described the motion of all objects in terms of inertia and force, and he found that they obeyed certain laws of conservation. In 1687, Newton published his thesis Philosophiæ Naturalis Principia Mathematica. [2] [9] In this work, Newton established three laws of motion which are always the way forces are described in physics. [9] For example, the gravitational force acts on a body in its field without coming into contact with it.