# 5 Conceptual Questions on Newton's 1st and 2nd Laws.pdf -...

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Conceptual Questions on Newton's 1st and 2nd LawsLearning Goal:To understand the meaning and the basic applications of Newton's 1st and 2nd laws.In this problem, you are given a diagram representing themotion of an object--amotion diagram. The dots represent theobject's position at moments separated by equal intervals oftime. The dots are connected by arrows representing theobject'saveragevelocity during the corresponding timeinterval.Your goal is to use this motion diagram to determine thedirection of the net force acting on the object. You will thendetermine which force diagrams and which situations maycorrespond to such a motion.Part AWhat is the direction of the net force acting on the object at position A?Hint 1.Using Newton's 2nd lawAccording to Newton's 2nd law, vectorsandhave the same direction. Can you determine the directionof acceleration at position A by analyzing the diagram?ANSWER:
CorrectThe velocity vectors connecting position A to the adjacent positions appear to have the same magnitude anddirection. Therefore, the acceleration is zero--and so is the net force.Part BWhat is the direction of the net force acting on the object at position B?

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