Newton's second law of motion

If an unbalanced force acts on an object then its velocity will change - it will either speed up, slow down, and that includes stopping, or the object will change direction. An unbalanced or resultant force produces an acceleration.
Newton’s second law of motion:space Force = mass x acceleration spaceor space F = ma
A force of one newton will give a mass of one kilogram an acceleration of 1 m/s2.

Newton's first law

A body remains at rest or in a state of uniform motion unless the forces acting on it are unbalanced.An object will stay still or carry on moving exactly the way it was unless an unbalanced force acts on it.An apple hanging from a tree or a skydiver falling at their terminal velocity are also both examples of Newton’s First Law.In the case of the apple the force of gravity downwards balances the force of the stalk upwards and so there is no unbalanced force acting on the apple – it therefore stays where it is.
The skydiver is falling but because the force of gravity is balanced by the drag of the air there is once again no unbalanced force and the motion of the skydiver is unchanged. This does not mean that they stop in mid air – it means that they fall at a steady speed.

schoolphysics CDs

In addition to accessing the online information you can now purchase two CDs containing much more material, some of which is not available through the website.
Click Here

Waves

In this unit we will discuss properties of waves and types of waves. Moreover, we will try to explain situations which can not be explained with light properties of matter. Disturbance of the shape of the elastic matters are transported from one end to other by the particles of that matter, we call this process wave. Be careful, during the transportation, no matter is transported.

Waves are classified in different ways with their properties. For example, mechanical waves and electromagnetic waves are classified according to the medium they transport energy. Water waves and sound waves are examples of mechanical wave on the contrary, light waves, radio waves are examples of electromagnetic waves. Electromagnetic waves can propagate in vacuum but mechanical waves need a medium to transport energy.

Waves can propagate in 1D, 2D and 3D. Spring waves are examples of 1D waves, water waves are examples of 2D waves and light and sound waves are examples of 3D waves.
Read more

Magnetism

In ancient times Greece people found a rock that attracts iron, nickel and cobalt. They call them as “magnet “and magnetism comes from here. These rocks were used later by Chinese people to make compasses. Later scientists found that, magnets have always two poles different from electricity. Magnets have two ends or faces called “poles” where the magnetic effect is highest. In last unit we saw that there is again two polarities in electricity, “-“charges and “+” charges. Electricity can exist as monopole but magnetism exists always in dipoles North Pole (represented by N) and South Pole (represented by S). If you break the rock into pieces you get small magnets and each magnet also has two poles N and S.
 Read more 

ELECTRIC CURRENT

In the last unit we have learned static electric, or charge at rest. However, in this unit we will deal with the charges in motion. We see the electric current everywhere in daily life. Most of the electrical devices work with electric current. In this unit we will try to explain direction of the flow of current, ohm’s law, and resistance of the electric circuit, resistors, measuring the current, and current density
Read More

Electrostatics with Examples

ELECTROSTATICS

Scientist found that if you rub an ebonite rod into silk you observe that rod pulls the paper pieces. Or in winter when you put off your pullover, your hair will be charged and move. We first examine the structure of atom to understand electricity better.

Read more