Physics practical readings: class/ grade 9.

Physics class 9 experiment reading: Measure the length and diameter of the solid cylinder with the help of a vernier calliper.

Physics class 9 experiment reading: Measure the thickness of a metal strip or a wire  by using a screw gauge.

Physics class 9 experiment reading: Study the motion of a ball rolling down along an angle  iron by drawing a  graph between "s" and "t2"

Physics class 9 experiment reading: Study the motion of a ball rolling down along an angle  iron by drawing a  graph between "s" and "t2"

Physics class 9 experiment reading: find the value of "g" gravitational constant by free fall method.

Physics class 9 experiment reading: determine the coefficient of sliding friction using a horizontal plane.

Physics class 9 experiment reading: determine the resultant of two vectors graphically by gravesands apparatus.

Physics class 9 experiment reading: determine the resultant of two vectors graphically by gravesands apparatus.

Physics class 9 experiment reading: verify the principle of moments by a meter rod balanced on a wedge.

Physics class 9 experiment reading: determine the mechanical advantage of an inclined plane.

Physics class 9 experiment reading: study the relationship between a load and extension of a helical spring by drawing a graph.

Physics class 9 experiment reading: study the relationship between a load and extension of a helical spring by drawing a graph.

Physics class 9 experiment reading: find the density of a body heavier than water by archemedes principle.

Physics class 9 experiment reading: find the density of a body heavier than water by archemedes principle.

Physics class 9 experiment reading: find the specific heat of a solid.

Physics class 9 experiment reading: find the specific heat of a solid.

Physics class 9 experiment reading: draw a graph between temperature and time when ice is converted to water and  then to steam by slow heating.

Physics class 9 experiment reading: draw a graph between temperature and time when ice is converted to water and  then to steam by slow heating.

How to draw neat and tidy diagrams?

Whether in your practical copies or your Exams, the drawings and diagrams have to be labelled and neat. If you add some shadings and sketchy marks to them, the merrier.
Here are some tips and tricks to make your work look neater:

1. Never ever draw the diagrams in the middle of the page, draw them towards the left, so that there is space for labeling's.
2. The diagram should not be very close to the top or bottom, but rather in the middle. There should however be space for the main heading, which should be below the drawing, not above it.
3. Give the main heading double underlines, and the labeling's single underlines, in case you have shortage of time or space (sometimes the labeling's are too many). 
4. Make the line end of the labeling's prominent by darkening the ends of the line.
5. Always use a full stop after each labeling.
6. make the first drawing with a light pencil, so that it can be rubbed off, when wrong. Once the first correct sketch has been drawn, only then use a dark pencil.
7. Use a tissue paper or cotton bud to shade or blend the shade.
8. Make sure your hands are clean before starting the labeling. Often shading leaves the hands gray because of the lead, so clean them up before starting the labeling.

System of units.

Chapter #1:

Physics and Measurement:

Short Answer Questions.

1. What is a system of units? List the basic Si units.

SYSTEM OF UNITS:
DEFINITION:
"A complete set of units both basic and derived for all kind of physical quantities is called a system of units."
HISTORY:
In 1960 an international committee agreed on a set of definitions and standards to describe the physical quantities. The system that is established is called the system international. Befor 1960 many system of units were in practice such as:

1. British FPS system.
2. MKS system.
3. CGS system.

However with expansion of trade and the utilization of science and technology international system of units was adopted.

IMPORTANCE:

Due to the simplicity and convenience with which the units in this system are amendable to arithmetic manipulation, it is in universal use by the worlds scientific community and by most nations. The system of unit is made of three kinds of units:

• Base units.
• Derived units.
• Supplementary units.

BASIC SI UNITS:

there are seven base units for various physical quantities namely length mass time, temperature, electric current, luminous intensity and amount of substance (with special reference to the number of particles)

The names of the base units along with their symbols for the physical quantities are listed:
(Make table)