** Basic physics book pdf FREE 2021**

*introduction** Basic physics book :*

*introduction*

*Basic physics book :*

**Units identify what a specific number represents**, For example, the number 42 can be used to represent 42 miles, 42 pounds, or 42 elephants! Without the units attached, the number is meaningless. Also, correct unit cancellation can help you find mistakes when you work out problems.

**Key Concepts and basic about physics : **

• Every calculation and answer to a **physics problem must include units**Even if a problem explicitly

asks for a speed in meters per second (m/s), the answer is 5 m/s, not 5.

• When you’re not sure how to attack a problem, you can often find the appropriate equation by thinking about which equation will provide an answer with the correct units For instance, if you are looking to predict or calculate a distance, use the equation where all the units cancel out, with only a unit of distance remaining.

**• This book uses SI units**

• When converting speeds from one set of units to another, remember the following rule of thumb: a speed measured in mi/hr is about a little more than double the value measured in m/s (i.e., 10 m/s

is equal to about20 MPH). Remember that the speed itself hasn’t changed, just our representation of the speed in a certain set of units.

*Contents of Basic Physics book:*

Basic Physics-SHM Wave

Basic Physics-Light Nature

Basic Physics-Optics .

Basic Physics-Force

Basic Physics-Motion .

Basic Physics-Projectile Motion

Basic Physics-Momentum

Basic Physics-Energy .

Basic Physics-Heat .

Basic Physics-Circular Motion

Basic Physics-Gravity .

Basic Physics-Electrostatics

Basic Physics-DC Electric Circuits

**Key Applications for BASICS PHYSICS :**

The late

*great physicist Enrico Fermi*used to solve problems by making educated guesses. For instance, say you want to guess timate the number of cans of soda drank by everybody in San Francisco in one year ,You’ll come pretty close if you guess that there are about 800,000 people in S.F., and that each person drinks on average about 100 cans per year So, 80,000,000 cans are consumed every year, Sure this answer is wrong, but it is likely not off by more than a factor of 10 That is, even if we guess we’re going to be in the ballpark of the right answer. That is always the first step in working out a physics problem.
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