Ch-04: Turning Effect of Forces

Chapter-04: Turning Effect of Forces

This post contains Notes of Physics for Class 9 for students of 9th grade. Here, you will find the 9th Class Physics Chapter 4 Notes, Numerical and Short questions with Answers. This chapter’s name is Turning effect of Forces. These Questions are for practice. However, students should prepare more study material besides these notes.

Q.1: Define: (i) Resultant Vector. (ii) Centre of gravity.

Ans:
(i) Resultant vector: The vector whose effect is the same as the combined affect of a number of vectors is called the resultant vector.

Ch-03: Dynamics

Ch-03: Dynamics
The third chapter of 9th Class Physics is "Dynamics". Short Questions with Answers of Chapter 03 of Physics Class 9. Here in this post you will find short questions and answers of chapter 3. Learn these short questions for exams preparation.
Q.1: Write two methods to reduce friction.
Ans. Friction can be reduced by: Making sliding surface moth. Lubricating the sliding surface.
Q.2: A force of 20N moves a body with an acceleration of 2mS-1. What is its mass?
Ans: F = 20N

Ch-02: Kinematics

Ch-02: Kinematics
This post contains the Physics Chapter 2 Short Qs for Class 9. Name of the 2nd chapter is Kinematics and all the short Qs are solved. Students of 9th Class can prepare these short Qs for the exams. However, they should prepare other Qs as per the instructions of their teachers too.
Q.1: A car travelling at 10 mS-1 accelerates uniformly at 2mS-2. Calculate its velocity after 5 seconds.
Solution. Vi = 10 mS-1 a = 2 ms-2 t = 5s Vf = ? Using the equation: Vf = Vi + at Vf = Vi + at Vf = 10 mS-1 + 2 ms-2 x 5s

Ch-01: Physical Quantities and Measurement

Ch-01: Physical Quantities and Measurement
Short Questions with Answers of Chapter 01 of Physics Class 9. The first chapter of 9th Class Physics is “Physical Quantities and Measurement”. Here in this post you will find short questions with answers. Learn these short questions for exams preparation.
1: Why Is the use of zero error necessary in a measuring instrument?
Ans. By the use at "Zero Error" the observation taken can be corrected, to get a correct observation

Glossary of Chemistry Term

Glossary of Chemistry

This glossary of chemistry terms is a list of terms and definitions relevant to chemistry, including chemical laws, diagrams and formulae, laboratory tools, glassware, and equipment. Chemistry is a physical science concerned with the composition, structure, and properties of matter, as well as the changes it undergoes during chemical reactions; it features an extensive vocabulary and a significant amount of jargon.

absolute zero

A theoretical condition concerning a system at the lowest limit of the thermodynamic temperature scale, or zero kelvins, at which the system does not emit or absorb energy (i.e. all atoms are at rest). By extrapolating the ideal gas law, the internationally agreed-upon value for absolute zero has been determined as -273.15 °C (−459.67 °F; 0.00 K).

absorbance

The physical or chemical process by which a substance in one state becomes incorporated into and retained by another substance of a different state.

Glossary of Physics Terms

Glossary of Physics Terms

This glossary of physics is a list of definitions of terms and concepts relevant to physics, its sub-disciplines, and related fields, including mechanics, materials science, nuclear physics, particle physics, and thermodynamics.

Acceleration:

Rate of change of velocity with time

Artificial Satellite:

Man made objects moving in fixed circular orbits around the earth.

Atomic Physics:

The branch of Physics that deals with the study of the structure and properties of atoms.

Self Esteem and Confidence for Children

Self-esteem can be defined as how children feel about themselves. Children's levels of self-esteem are evident in their behavior and attitudes. If children feel good about themselves, these good feelings will be reflected in how they relate to friends, teachers, siblings, parents, and others.

Branches of Physics

Branches of physics are the subjects studied within the scope of physics. The physics can be defined as the branch of science which deals with the study of properties of matter and energy along with the interaction between them is undertaken.

Difference Between Density and Volume

Density and volume are scientific concepts pertaining to physical properties and characteristics of matter. Volume refers to the measurement of the amount of three-dimensional space occupied by an object.

Difference Between Pound and Kilogram

 It is quite easy to differentiate between pounds and kilos when talking in general terms. Both pound and kilogram are units of measurement of weight or mass. A pound is an imperial unit of mass or weight. A kilogram (kg) is stated to be 2.2 times heavier than a pound (represented as lbs).

Difference Between Qualitative and Quantitative Research

The difference between Qualitative and Quantitative Research is to understand the key fields of research and learning to differentiate between one and the other. In the field of business, science and technology, economics, etc, they use two standard ways of conducting research.

Difference Between Average and Mean

To understand the difference between average and mean, one must be aware of what separates one from the other. Average and mean are used interchangeably. In Statistics, instead of the term “average”, the term “mean” is used.

Difference Between Log and Ln

The difference between log and ln is that log is defined for base 10 and ln is denoted for base e. For example, log of base 2 is represented as log2 and log of base e, i.e. loge = ln (natural log).

Difference Between Mean and Median

 The difference between mean and median is explained in detail here. In statistics, mean is the average of a set of data and the median is the middle value of the arranged set of data.

Difference Between Variance and Standard Deviation

 Understanding the main difference between Variance and Standard deviation is important to know. These mathematical terms are usually used in normal mathematical equations to solve problems.