Consider a box kept inside a train moving with a constant acceleration. Which of the following types of friction opposes the relative motion of the box with respect to the train, allowing it to remain stationary relative to the train floor?

The tendency of an object to resist a change in its state of motion is called:

A box of mass 15 kg is kept on the floor of a stationary trolley. The coefficient of static friction between the box and the trolley is 0.12. To keep the box stationary relative to the trolley, the maximum horizontal acceleration (in m/s2) with which the trolley can move is: (g = 10 m/s2)