Assertion: In and elastic collision of two billiard balls, the total kinetic energy is conserved during the short time of collision of balls.Reason: Energy spent against friction does not follow the law of conservation of energy

Kinematics topics include: Centripetal force, energy and work. Kinematics is a branch of physics that studies the motion of objects without considering the forces that cause them to move. It includes concepts like distance, speed, and acceleration, and how those values change over time.  The word "kinematics" comes from the Greek word kinesis, which means "motion". It's related to other English words like "cinema" and "kinesiology".  Kinematics considers concepts like: Velocity: The displacement of an object divided by the time it takes. Velocity is a vector quantity, which means it has... Show more

Kinematics topics include: Centripetal force, energy and work.

Kinematics is a branch of physics that studies the motion of objects without considering the forces that cause them to move. It includes concepts like distance, speed, and acceleration, and how those values change over time. 
The word "kinematics" comes from the Greek word kinesis, which means "motion". It's related to other English words like "cinema" and "kinesiology". 

Kinematics considers concepts like:
Velocity: The displacement of an object divided by the time it takes. Velocity is a vector quantity, which means it has both magnitude and direction.
Acceleration: The rate of change of velocity. Acceleration can be caused by a change in the magnitude or direction of velocity.
Uniform circular motion: When a body travels in a circle at a constant speed. The body's distance from the axis of rotation remains constant. 

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