Free, Damped and Forced Oscillations
ICSE · Class 11 · Physics
Flashcards for Free, Damped and Forced Oscillations — ICSE Class 11 Physics. Quick Q&A cards covering key concepts, definitions, and formulas.
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State the meaning of natural frequency.
Answer
Natural frequency is the definite frequency with which a body oscillates when displaced from equilibrium and left free. It depends on intrinsic properties such as size, elasticity, length, density, an…
What happens when a body is displaced from equilibrium and then left free?
Answer
It begins to oscillate with a definite frequency due to the restoring force. These are free oscillations. In ideal form, the amplitude remains constant, but in practice damping causes the amplitude to…
Why do real oscillations gradually die out?
Answer
Damping force opposes motion and converts mechanical energy into heat. Since this energy is never returned, the amplitude keeps decreasing until the body stops.
State the definition of damping.
Answer
Damping is the continuous decrease in the amplitude of oscillations due to energy dissipation.
What are forced oscillations?
Answer
Forced oscillations are oscillations in which a body acted upon by an external periodic force eventually oscillates with the frequency of that external force. The initial irregular motion dies out and…
Why is the frequency of forced oscillations not the body's natural frequency?
Answer
Once the initial irregular oscillations die out, the body is forced to follow the external periodic force. So the final oscillation frequency becomes the frequency of the applied force, not the body's…
A body oscillates freely with constant amplitude of 4 cm in an ideal case. What happens in practice after damping acts?
Answer
Amplitude decreases with time. Step 1: Ideal free oscillation amplitude = 4 cm. Step 2: Damping removes energy from the system. Step 3: Amplitude reduces gradually from 4 cm. Step 4: When all energy …
A tuning fork on a rubber pad produces weak sound. Why does placing its stem on a table make the sound stronger?
Answer
The fork sends vibrations to the table, and the table undergoes forced oscillations. Because the table has a large surface area, it sends sound waves into a larger volume of air, so the sound becomes …
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