The Basics of Physics-Friction

Friction occurs when two bodies slide over each other.Friction can be defined as the resistance to motion experienced when two surfaces in contact move with respect to each other.
Whenever two bodies slide over each other,each exerts a force which opposes movement.We can see that as it becomes harder to move the objects.Rough and coarse surfaces offer more friction than smooth and polished surfaces.We can walk easier on rougher surfaces than on smoother surfaces due to friction.Friction can also be produced by air and water which can oppose the motion of vehicles.

Basics of Physics-Force

A force is a push or pull acting on an object.A common example of force is pushing or pulling someone,kicking a football,swinging a bat,etc.
Force can do many things to an object

• It can stop or slow down a moving object
• It can move a still object
• It can change the shape or size of an object
• It can change the speed of a moving object
• It can change the direction of a moving object

 

Chemistry Fun Activity 1

Hello!As we discussed earlier,graphite is a non-metal which is a good conductor of electricity.Now we will use this property to make a circuit with graphite as a medium.Take a look at the instructions to make your circuit.


Materials you need:
Some wire,A bulb,Battery,2 pencils sharpened at both ends,some cello tape and scissors.

Method

1. Take 2  pieces of wire and cut them into two halves each so that you have four reasonably long pieces of wire
2. Connect two pieces of wire two the Battery and the other two pieces to the bulb.
3. Now you will have two separate halves of the circuit,one with the bulb and one with the battery.
4. Now connect the two halves of the circuit with the pencils MAKING SURE THAT THE WIRE TOUCHES THE LEAD OF THE PENCIL.
5. Now your circuit is ready.

Basics of Chemistry-Physical and Chemical changes

Physical Change
Physical changes are changes that do not produce new substances.Most of the physical changes are reversible.However,some physical changes like tearing of paper are not reversible.Other examples of Physical changes are mixing salt with water,freezing of water,breaking of glass.

Chemical Change
In a chemical change,a new substance is formed.Chemical changes are irreversible.Some examples of Chemical changes are growing up,cooking of food,burning of a substance,etc.

  

 

Basics of Chemistry-Compounds and Mixtures

Compounds and mixtures are two more important parts of chemistry. 

Mixtures
Mixtures are a combination of two or more substances that are mixed simply.This is a physical change and the original substances can be obtained from the mixture.A common example of a mixture is Salt water.Sand mixed with water is also a mixture.

Compounds
Compounds and mixtures are almost same.But in a compound,two or more substances are chemically combined.This is a chemical and irreversible change and the original substances cannot be obtained.A common example of a compound is water.