Question

An object may appear to be moving for one person and stationary for some other. For the passengers in a moving bus, the roadside trees appear to be moving backwards. A person standing on the road–side perceives the bus along with the passengers as moving. However, a passenger inside the bus sees his fellow passengers to be at rest.
Most motions are complex. Some objects may move in a straight line, others may take a circular path. Some may rotate and a few others may vibrate. There may be situations involving a combination of these.
(a) Can any object be at absolute rest?
(b) Is displacement a scalar quantity?
(c) Define oscillatory motion
(d) Define mechanics

Answer 1

Answer:

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Explanation:

• Can any object be at absolute rest?

Ans-Rest and motion are always relative. A body cannot exist at a state of absolute rest or absolute motion. For example, two persons sitting in a moving bus are at rest w.r.t each other but are in motion w.r.t. a person standing on the roadside. ... Thus, there is no object which can be condisered to be at absolute rest.

• Is displacement a scalar quantity?

Ans- Distance is a scalar quantity that refers to "how much ground an object has covered" during its motion. Displacement is a vector quantity that refers to "how far out of place an object is"; it is the object's overall change in position.

• Define oscillatory motion

Ans- Oscillatory motion can be termed as the repeated motion in which an object repeats the same movement over and over. ... In the absence of friction, the oscillatory motion would continue forever; but in the real world, the system eventually settles into equilibrium.

• Define mechanics

Ans - Mechanics is the area of physics concerned with the motions of macroscopic objects. Forces applied to objects result in displacements, or changes of an object's position relative to its environment. This branch of physics has its origins in Ancient Greece with the writings of Aristotle and Archimedes.

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