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The study of motion is kinematics, but kinematics only describes the way objects move—their velocity and their acceleration. Dynamics considers the forces that affect the motion of moving objects and systems. Newton’s laws of motion are the foundation of dynamics.
An object is set into motion when it is pushed or pulled or subjected to a force. The force can be described by the effect that accelerates or decelerates the object or make changes in its position or in its shape. Such effects are described accurately by general laws of motion, were first stated fully by Sir Isaac Newton (1642-1727).
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How do we describe motion? g is the same for all falling objects, regardless of their mass. • How do we describe motion? • How is mass different from weight? • All falling objects accelerate at the same rate (not counting friction of air resistance). • On Earth, g ≈ 10 m/s2: speed increases 10 m/s with each second of falling.
The explanation for why an object moves (or why it doesn’t move, if it remains at rest) revolves around the force or forces that the object experiences, so we will spend some time discussing what forces are. Sir Isaac Newton made several key contributions to our understanding of forces.
Newton's Laws: Forces and Motion. A force is a push or a pull. A force is a vector : it has a magnitude and a direction. Forces add like vectors, not like scalars. Example: Two forces, labeled. same magnitude. F1 and F2, are both acting on the same object. The forces have the.
One of the most important examples of periodic motion is simple harmonic motion (SHM), in which some physical quantity varies sinusoidally. Suppose a function of time has the form of a sine wave function, y(t) = Asin(2πt / T ) (23.1.1) where A > 0 is the amplitude (maximum value).
When object starts from rest and undergoes constant acceleration: Position is proportional to the square of time. Position changes result in the sequence of odd numbers. Falling bodies exhibit this type of motion (since g is constant).
