Kinematics || Lecture - 07 || Manish Raj Sir || Class 11 || Physics || NEET

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Kinematics is the branch of classical mechanics that studies the motion of objects without considering the forces that cause the motion. It deals with the mathematical description of motion and the relationships among motion variables, such as displacement, velocity, acceleration, and time. In NEET (National Eligibility cum Entrance Test) perspective, Kinematics is an important topic in Physics and is a part of the NEET Physics syllabus.

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Topic Briefly Discussed

Thermal Expansion

Thermal expansion is a physical phenomenon where the dimensions of a material increase or decrease in response to changes in temperature. When a material is heated, its particles gain kinetic energy and move faster, causing them to vibrate and occupy more space. This increase in space between the particles leads to an increase in the overall volume or length of the material, which is known as thermal expansion. Conversely, when a material is cooled, its particles lose kinetic energy and move more slowly, resulting in a decrease in volume or length, known as thermal contraction.

The amount of thermal expansion that occurs in a material depends on a number of factors, including its composition, temperature change, and shape. Different materials have different coefficients of thermal expansion, which represent the amount of expansion that occurs per unit length or volume per unit temperature change. For example, metals generally have higher coefficients of thermal expansion than ceramics or polymers, meaning they expand more for a given temperature change.

Thermal expansion is an important consideration in many applications, including building construction, where it can cause materials to warp, buckle, or crack if not accounted for. It is also relevant in the design of machinery and equipment, where thermal expansion and contraction can affect the fit and function of components.

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