Author: alphatoomega00

FORCE

FORCE – WHAT IS IT ?

It is simply defined as a push or pull.

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  • Force may cause movement (change of state) ,acceleration, or deformation of an object.
  • At least two objects must interact to a force to come into play.

HOW FORCE IS EXPRESSED?

  • The strength of force is expressed in its magnitude.
  • Forces applied on an object in the same direction are added to one another.

 

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  • If the two forces act in the opposite directions on an object, the net force acting on it is the difference between the two forces.
  • Hence, in rest net force on a body is zero.

FORCE- MEASURING UNITS

The unit of measure for force is the newton which is abbreviated as “N”. One newton is the force needed to accelerate one gram of mass by one centimeter per second squared. Other units of force include the dyne and the pound-force

TYPES OF FORCES

  • Friction – Friction is a force caused when one object rubs against another. It works in the opposite direction of the main force.
  • Gravity – Gravity is a force caused by a large body, such as the Earth. Gravity pulls objects toward the Earth with an acceleration of “g” which equals 9.8 m/s2.
  • Electromagnetic – Electromagnetic force is a force associated with electric and magnetic fields.
  • Nuclear – Nuclear forces are the forces that hold atoms and their particles together.
  • Tension – A pulling force that is exerted by a string, cable, or chain on another object.
  • Elastic – An elastic force is a force exerted by an object trying to return to its natural length. This is modeled by a spring that has been pulled by an external force, but is pulling back while trying to return to its original length.

SOME MORE FACTS

  • An object that is accelerating in a circular motion experiences “centripetal” force.
  • The four fundamental forces are gravity, electromagnetic force, the strong nuclear force, and the weak nuclear force.
  • Torque is a type of force that measures changes in the rotational speed of an object. Torque is an important feature of automobiles, especially trucks.
  • Drag is a force that decreases the velocity of an object. Thrust is a force that increases the velocity of an object.

REFERENCES

Click to access hesc111.pdf

https://www.ducksters.com/science/physics/force.php

IMAGE COURTESY

http://mzayat.com/singlec/3727111.html