Force & Relative Motion

Relative Motion:
The motion of two or more objects can be viewed in different ways the motion can be compared to a stationary object, e.g. the ground, or it can be compared to another moving object.

Force: 
A force is simply a push or a pull on an object. When you push any object you are exerting a force on it. Forces surround us all the time. However it is not possible to describe a force as we can describe some object.
We can only describe what a force can do.
When a net force acts on an object it can:
-change the velocity of the object, either accelerating or decelerating it.
-change the direction that the object is moving in
-change the objects shape, or deform it. 


Contact forces: 
Contact forces are forces that act in contact with the object. Contact forces operate when particles or objects are in direct contact with each other i.e: when a wheel of any object is in contact with a road surface, when a person sits on a seat, when the wind blows against you.

Non-contact forces: 
Non contact forces are forces that can act on an object over a distance. i.e: gravitational, electrical, magnetic, and nuclear.
Gravitational force pulls us down even if we are not in contact with the earth, stops the loss of small particles from earth to space and influences the earth and other planets revolving around the sun.
Electrical force is the force between charged objects. Thunderstorms are a spectacular display of electrical forces at work.
Magnetic force which is related to electrical force, is responsible for the repulsion of two like magnetic poles when they are brought close together.
Nuclear forces are the forces acting between the many particles that make up the nucleus of an atom.


Spring Balance:
A spring balance is a common piece of equipment used to measure force in a laboratory.
This is how it works:
When a force is applied to the balance, a spring extends. This spring is attached to a pointer which indicates the force on a calibrated scale. The greater the force, the greater the extension of the spring. Force is measured in newtons. This unit of force is named after Sir Isaac Newton, a famous british scientist. A force of one newton will accelerate a mass of 1 kg at a rate of 1 m s to the power of negative 2.

DISCLAIMER: I DO NOT OWN THESE NOTES ALL RIGHTS BELONG TO THEIR OWNER: THE AUTHOR OF MY WORKSHEETS, THE AUTHOR OF MY BROUGHT, GIVEN OR BORROWED TEXTBOOKS. 

AND LASTLY, THE WORKS GIVEN FROM MY SCIENCE TEACHER.