Lecture

Uniform Motion: Acceleration and Reference Frames

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Description

This lecture covers the description of uniformly accelerated motion, the concept of reference frames, and the calculation of average velocity and displacement. It also discusses the importance of choosing the right reference frame and units for measurements, as well as the distinction between average and instantaneous velocity and acceleration. The instructor demonstrates these concepts through examples like a moving train and the motion of a ball. The lecture concludes with equations for uniformly accelerated rectilinear motion and the calculation of average acceleration. Various systems of units are presented, including the International System (SI) and the centimeter-gram-second (cgs) system.

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Ontological neighbourhood

Physics

Mechanics: Classical mechanics

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Velocity is the speed and the direction of motion of an object. Velocity is a fundamental concept in kinematics, the branch of classical mechanics that describes the motion of bodies. Velocity is a physical vector quantity: both magnitude and direction are needed to define it. The scalar absolute value (magnitude) of velocity is called , being a coherent derived unit whose quantity is measured in the SI (metric system) as metres per second (m/s or m⋅s−1). For example, "5 metres per second" is a scalar, whereas "5 metres per second east" is a vector.

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In mechanics, acceleration is the rate of change of the velocity of an object with respect to time. Accelerations are vector quantities (in that they have magnitude and direction). The orientation of an object's acceleration is given by the orientation of the net force acting on that object. The magnitude of an object's acceleration, as described by Newton's Second Law, is the combined effect of two causes: the net balance of all external forces acting onto that object — magnitude is directly proportional to this net resulting force; that object's mass, depending on the materials out of which it is made — magnitude is inversely proportional to the object's mass.

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