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probley because you have the heater on
That was a poor answer, and the question deserves better. When accelerating, the car's engine generates higher RPM's, which causes the water pump to spin faster. This added pressure from the water pump is sometimes enough to push coolant past a heater core that is having problems (perhaps you have a clogged heater core - this can be remedied by reverse-flushing the heater core).
Others have also suggested that the car exhibiting the symptoms may have a low coolant level. The added pressure from the water pump at higher RPM's is enough to allow even a car with a low level of coolant to circulate some of the coolant through the heater core. It might also be worth checking your coolant levels if you have not already done so (note that you should check not only the coolant reservoir, but also the level of coolant within the radiator itself).
Good luck.
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