# Physics Formulas for Class 11 Chapter 6 Work Energy and Power

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Here we are providing important Physics Formulas for Class 11 Students. These formulas are useful for every student studying physics. Learning physics formulas is important for exams because they provide a compact and precise way of expressing the fundamental concepts and laws of physics. They allow you to quickly recall the relationships between physical quantities and use them to solve problems. Additionally, many exam questions in physics will require you to apply these formulas, so having a solid understanding of them is crucial for achieving a high score on the exam.

### Work, Energy and Power

1) $$\quad W=\vec{F} \cdot \vec{s}$$
2) $$W=|F||s| \cos \theta$$
3) $$W=\int_{s_1}^{s_2} \vec{F} \cdot d \vec{s}$$
4) $$\quad K.E. =\frac{1}{2} m v^2=\frac{p^2}{2 m}$$

5) $$\quad p=\sqrt{2 m(\text { K.E. })}$$
6) $$W=\frac{1}{2} m v^2-\frac{1}{2} m u^2$$
7) $$\vec{F}_{n e t} \cdot \vec{s}=\frac{1}{2} m\left(v^2-u^2\right)=\Delta K.E.$$
8) $$\quad P.E. of spring =\frac{1}{2} k x^2$$
9) $$U=\frac{1}{2} k x^2=\frac{1}{2} F x=\frac{F^2}{2 k}$$
10) $$\Delta P.E. =m g h_2-m g h_1=m g \Delta h$$
11) $$P=\frac{W}{t}=\frac{d W}{d t}$$

12) $$\quad P=\vec{F} \cdot \vec{v}$$
13) $$\vec{F}=\frac{-d v}{d \vec{s}}$$
14)
\begin{aligned} & F_x=\frac{-\partial U}{\partial x} \\ & F_y=\frac{-\partial U}{\partial y} \\ & F_z=\frac{-\partial U}{\partial z} \end{aligned}
15) For equilibrium,
$$F=0 \Rightarrow \frac{-d U}{d s}=0$$

(1) What are the best ways to remember physics formulas?

Here are a few effective ways to remember physics formulas:

1. Practice using the formulas: Regularly working through problems that require you to apply the formulas will help solidify your understanding of them and make it easier to recall them when needed.
2. Associate with physical concepts: Try to understand the physical concepts behind each formula, as this will help you to remember the formula and its purpose.
3. Create flashcards: Write the formula on one side of the card and its explanation or example on the other. Reviewing the flashcards regularly can help you memorize the formulas.
4. Make mnemonics: Use memory aids, such as mnemonics, to help you remember the formulas.
5. Repeat, Repeat, Repeat: The more you repeat and use the formulas, the easier it will become to recall them.

Remember, the key to effectively remembering physics formulas is consistent practice and repetition.

(2) How many formulas are there in class 11 physics?

Answer: The number of physics formulas in physics is difficult to quantify as new formulas are being developed and old ones refined all the time. Additionally, the number of formulas used in a particular area of physics can vary greatly depending on the level of study and the specific topic being covered.

(3) Is remembering physics formulas difficult?