Physics - NLM Question with Solution | TestHub

In Newtonian physics, real forces (gravity, normal, tension, friction) are the same in all frames - they describe physical interactions. (A) does not depend on the frame.

Time is absolute in Newtonian physics - the same elapsed time in every frame. (B) does not depend on the frame.

Work = F.s and kinetic energy = (1/2)mv^2 both involve displacement and velocity, which change from one frame to another (e.g. ground frame vs. a moving train).

$$\mathrm{W}=\vec{\mathrm{F}}\cdot \vec{\mathrm{s}},\mathrm{K}=\frac{1}{2}{\mathrm{mv}}^2$$

So work and kinetic energy depend on the frame of reference. Correct options: (C), (D).