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Reverted edits by MasterM (Talk); changed back to last version by Ed Poor
The motion of an object will continue until something makes it change its motion. A railroad car, once it gets going, will continue its motion for a long time, until the tiny forces of friction cause it to slow down and stop. This can take miles. Even putting on the brakes can take up to mile, because there is so much momentum.
The motion of an object will continue until something makes it change its motion. A railroad car, once it gets going, will continue its motion for a long time, until the tiny forces of friction cause it to slow down and stop. This can take miles. Even putting on the brakes can take up to mile, because there is so much momentum.
Momentum is defined in [[Physics]] as the product (p) of a body's [[mass]] and [[velocity]].
Momentum is defined in [[Physics]] as the product (p) of a body's [[mass]] and [[velocity]].