Is it possible for a particle to describe a curved path if no force acts on it? Does your answer depend on the frame of ereference chosen to view the particle?

Does a scalar quantity depend upon the frame of reference chosen .

Does a vector quantity depends upon frame of reference chosen?

Can an object move along a curved path if no force acts on it?

Is it possible to move in a curved path in the absence of a net force?

A particle moves along a circular path under the action of a force. The work done by the force is

An object may be regarded to be rest or in motion depending on the frame of reference chosen to view the object. Because of length contraction it would mean that the same rod may have two dfferent lenghts depending on the state of the observe. Is this true ?

The acceleration of a particle is zero as measured from an inertial frame of reference. Can we conclude that no force acts on the particle?

Mass of a particle depends on its speed . Does the attraction of the earth on the particle also depend on the paricle's speed ?