Here's a breakdown:
* Normal force (N): This is the force exerted by a surface perpendicular to the object in contact with it. It prevents the object from falling through the surface.
* Force of gravity (Fg): This is the force that pulls the object downwards due to its mass and the Earth's gravitational field.
Example: Imagine a book resting on a table.
* The force of gravity pulls the book downwards.
* The table exerts an upward force on the book, which is the normal force.
Since the book is not accelerating vertically (it's at rest), these two forces must be equal in magnitude and opposite in direction. This is why the normal force is equal to the force of gravity.
Key points:
* The normal force is always perpendicular to the surface.
* The normal force is not always equal to the object's weight. This is only true when the surface is horizontal and the object is at rest or moving at a constant velocity.
* The normal force can be greater than the object's weight if there is an additional force pushing the object against the surface. For example, if you press down on the book, the normal force will be greater than the book's weight.
Formula:
The magnitude of the normal force can be calculated using the following formula:
* N = mg, where:
* N is the normal force
* m is the mass of the object
* g is the acceleration due to gravity (approximately 9.8 m/s²)
