alleryWhich of these is an example of dynamic equilibrium?
AA book lying on a table
BA ladder leaning against a wall
CA bridge supporting a static load
DA raindrop falling at terminal velocity
Answer & Solution
Correct answer: D. A raindrop falling at terminal velocity
1. Dynamic equilibrium means net force is zero but the body keeps moving with constant velocity.
2. At terminal velocity, gravity is balanced by air drag, so net force is zero.
3. The raindrop continues to fall at constant speed.
4. The other three are static cases of bodies at rest.
_Source: Selina Concise Physics ICSE Class 10, Ch 1 'Force' (icsehelp.com chapter extract)_
Keep practising Unit 8: Fluids: Density, Buoyancy and Continuity
Browse all Unit 8: Fluids: Density, Buoyancy and Continuity questions for AP Physics 1, or explore more Physics topics.
Related questions
Sound levels above 80 dB sustained for long periods can:Speed of sound in air is roughly:Sound is produced by:What is the TIME PERIOD of a sound wave with frequency 100 Hz?A whistle has a frequency of 1700 Hz. If the speed of sound in air is 340 m/s, the wavelenThe wavelength λ, frequency ν, and speed v of a wave are related by:The minimum distance from a reflecting surface needed to hear a CLEAR echo (with speed of Spot the odd sound frequency