# Category: Physics

## Types of Measurement & Reasons of Measurement Error

Types of Measurement Direct Measurement such as measuring liquid density using the hydrometer in which we take a direct reading without calculation or using any law , Measuring volume using the graduated cylinder .

## Measuring units , Standard units and Dimensional Formula

Measuring units Each physical quantity either fundamental or derived, has a measuring unit , The quantity without its unit is meaningless, There is a number of systems to specify the measuring units of the...

## Physical Quantities and measuring tools

Physical measurements Measurement is the process of comparing an unknown quantity with another quantity of its kind (called the unit of measurement) to find out how many times the first includes the second, Key...

## The factors affecting the friction between the solid objects and the water

When any object moves through the water (such as the fish, the swimmer, the dolphin, and the ship), there is a friction force arises between this object and the water which is called water...

## The friction between the solid objects and the air

When a solid object moves in the air, a friction force arises between the object and the air, This type of friction is called the air resistance and it acts in the opposite direction...

## Factors affecting the friction between two solid objects

Friction between two solid objects The friction arises when two solid objects touch each other, When the friction force is larger than the movement force, the body does not move, when the friction force...