Question

-According to Newton’s First Law, which of the following statements is true?

a) If an object is in motion, then a force is acting on it.

b) A force is necessary to change the motion of an object.

c) If an object is stationary, then no forces are acting on it.

d) An object in motion must have an acceleration.

-If an object is in motion, can its acceleration be zero?

-If an object’s acceleration is zero, does that mean that no forces are acting on it?

-A centripetal acceleration can a) Change an object’s direction. b) Change an object’s speed.

-A tangential acceleration can a) Change an object’s direction. b) Change an object’s speed

-Choose the answer that best describes the acceleration for the following situations. • An object moves in a straight line at a constant speed ___________________. • An object moves in a circle at a constant speed_________________________. • An object moves in a straight line while slowing to a stop _________________. Answers: The acceleration… a. Points parallel to the velocity, and in the same direction. b. Points parallel to the velocity, but in the opposite direction. c. Points radially inward. d. Points radially outward. e. Is zero.

Answer 1

According to newton first law i.e law of inertia.

States that if a body at remains at rest unless and untill any external force is acted to change its position hence as per the law we can see that only one option satisfies the rule i.e option B hence when a force will act on that body its position will chnage and newton's law will be followed.

So our answer is option B.

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