your velocity will change for sure but speed may not. As the velocity changes, the motion is accelerated.-Read Newtons 1st Law again. Note the phrase straight line motion.If you do not have straight line motion then acceleration is required-Momentum-Because you need a force to change the direction,......
It's beacuse acceleration is change in velocity/time. Constant speed does not mean constant velocity. If you change your direction, your velocity will change for sure but speed may not. As the velocity changes, the motion is accelerated.
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Read Newton's 1st Law again. Note the phrase " straight line motion". If you do not have straight line motion then acceleration is required
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Momentum
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Because you need a force to change the direction, and a = F/m
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