State any two conditions in which velocity can be changed
Answers
Answer:
Only a mechanical force can change the velocity of a body as determined by an inertial frame according to special relativity. Let me say this in a more precise manner.
An observer that is using an inertial frame, the ONLY way to change the velocity of a body is to apply a mechanical force to the body that is a nonzero vector. This will be true under all conditions where special relativity is valid.
Types of mechanical force include electromagnetic forces, strong nuclear forces, weak nuclear forces, contact forces, frictional and centripetal forces. There is some overlap in this list because it encompasses different length scales. However, the overlap is not important for relativity. Mechanical force does not include gravity or any other inertial force.
Roughly the same thing can be said of a free falling frame. However, it gets more complicated because general relativity is a ‘nonlocal’ theory.
If there is a gravitational gradient, then the free falling frame can observe distant bodies to accelerate due to inertial forces rather than mechanical forces. Inertial forces include gravity, centrifugal and Coriolis force.
Answer:
The velocity of an object can be changed by: Change of speedand Change of direction .
hope it will help you
please mark me as brainliest and follow me