Which procedure would cause charged particles in a conductor to move in the same direction?

Two steel balls, each of mass m, are welded to a light rod of length l and negligible mass and are initially at rest on a smooth horizontal surface. a horizontal force of magnitude f is suddenly applied to the rod as shown. determine (a) the instantaneous acceleration a of the mass center g and (b) the corresponding rate at which the angular velocity of the assembly about g is changing with time.

The force it would take to accelerate an 900-kg car at the rate of 6m/s2

It is advised not to hold the thermometer by the bulb while reading it