Introduction
Force is a push or pull that can change an object's state of motion or shape. It's a fundamental concept in physics that helps us understand how objects interact with each other.
Types of Forces:
A) contact force has two types
B) Non contact force has types
• Muscular Force: The force exerted by
our muscles, like when we lift or move objects.
• Frictional Force: The force that opposes
motion between two surfaces in contact, like when we try to slide a box on the floor.
• Magnetic Force: The force exerted by
magnets, which can attract or repel other magnets or magnetic materials.
• Electrostatic Force: The force exerted
by charged particles, like when we rub a balloon against our hair and it sticks to the wall.
• Gravitational Force: The force that pulls
objects towards each other, like the Earth's gravity pulling us towards its center.
Pressure
Pressure is the force acting per unit area on an object's surface. It's calculated by dividing the force by the area on which it acts. Pressure can be exerted by solids, liquids, and gases.
• Liquid Pressure: Liquids exert pressure
on the walls of their container and increase with depth.
•
Atmospheric Pressure: The pressure
exerted by the air around us, which is essential for our survival.
Key Concepts
• Force: A push or pull that can change an object's motion or shape.
• Pressure: The force acting per unit area on an object's surface.
•
Friction: The force opposing motion between two surfaces in contact.
•
Gravity: The force pulling objects towards each other.
Important Formulas
• Pressure = Force / Area: The formula to
calculate pressure.
