What will be the effect of the earth's rotational speed is increased and what is the effect of the rotation of the Earth on the value of acceleration due to gravity?
The faster the Earth spins, the shorter our days would become. With a 1 mph speed increase, the day would only get about a minute and a half shorter and our internal body clocks, which stick to a pretty strict 24-hour schedule, probably wouldn't notice. The acceleration due to gravity decreases due to rotation of the earth. This effect is zero at poles and maximum at the equator.