Exam (elaborations)
Oscillations.
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Exam of 2 pages for the course LPSP1202 - Chapitre 12 - Troubles du sommeil at LPSP1202 - Chapitre 12 - Troubles du sommeil (Oscillations.)
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Oscillations✅
What is simple harmonic motion?- An oscillation in which the force is
proportional to the displacement and is in the opposite direction.
✅
What are the conditions for SHM?- Acceleration (and force) must be
proportional to displacement from the equilibrium point.
It must act towards the equilibrium point.
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True or false? Velocity is maximum when displacement is
maximum.- False.
The velocity is a minimum at the amplitude of oscillation.
Velocity is a maximum when it passes through the equilibrium position.
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What is damping?- Damping is the process by which the amplitude of the
oscillations decreases over time. This is due to energy loss to resistive
forces such as drag or friction.
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Explain the difference between light damping, heavy damping and critical
damping.- Light damping occurs naturally and the amplitude decreases
exponentially. When heavy damping occurs the amplitude decreases
dramatically. In critical damping the object stops before one oscillation is
completed.
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What is the difference between free and forced oscillations?- When an
object oscillates without any external forces being applied, it oscillates at its
natural frequency. This is known as free oscillation. Forced oscillation
occurs when a periodic driving force is applied to an object, which causes it
to oscillate at a particular frequency.
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What is resonance?- When the driving frequency of the external force
applied to an object is the same as the natural frequency of the object,
resonance occurs. This is when the amplitude of oscillation rapidly
increases, and if there is no damping, the amplitude will continue to
increase until the system fails. As damping is increased, the amplitude will
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