Science Ch:- Force and pressure

Hello Everyone, 

I am Akash A tutor and professional educator This class is specially for class 8 student In science subject of ch Force and  pressure 😖😖. Student will learn what is force? What types of Forces are? What is pressure? How it can be calculated? And some extra information from upper class. 

If you are one of the student who is attending the class you must carry these thing during class:-

•NCERT SCIENCE BOOK

•A NOTEBOOK FOR NOTES WRITING

•PEN/PENCIL 

•And Your MIND also should be in the class😄

Sure, here is a summary of the concepts of force and pressure typically taught in class 8:

### Force

1. **Definition**: A force is a push or pull upon an object resulting from its interaction with another object.

2. **Types of Forces**:

   - **Contact Forces**: Forces that act on an object through physical contact (e.g., friction, tension, normal force).

   - **Non-Contact Forces**: Forces that act on an object without physical contact (e.g., gravitational force, magnetic force, electrostatic force).

3. **Effects of Force**:

   - Can change the state of motion of an object (e.g., a stationary object can start moving, a moving object can stop).

   - Can change the shape or size of an object.

4. **Unit of Force**: The SI unit of force is the Newton (N).

### Pressure

1. **Definition**: Pressure is the force exerted per unit area.

2. **Formula**: 

   \[

   \text{Pressure} = \frac{\text{Force}}{\text{Area}}

   \]

3. **Units**: The SI unit of pressure is the Pascal (Pa), where 1 Pascal = 1 Newton per square meter (N/m²).

4. **Examples**: 

   - Air pressure, water pressure, pressure exerted by solids.

5. **Applications**:

   - Blowing air into a balloon, hydraulic systems, walking on sand (feet vs. snowshoes).

### Key Points to Remember

- **Balanced Forces**: When two forces acting on an object are equal in size but opposite in direction, they are called balanced forces. Balanced forces do not change the state of rest or motion of an object.

- **Unbalanced Forces**: When the forces acting on an object are not equal and opposite, they are unbalanced forces. Unbalanced forces cause a change in the object's state of motion.

Understanding these basic concepts is crucial for grasping more complex physics topics in higher classes.