Which of the following statments is not related to Newton\'s first law? a) A bal

Question

Which of the following statments is not related to Newton's first law?

a) A ball which is rolling on smooth, level ground needs a force to get it to slow down.

b) Compared with a lighter rock, a heavier rock needs a stronger force in order to slow it down at the same rate.

c) Actually, all of the other answers are related to Newton's first law.

d) A rock which is at rest needs something to push it to get it to start moving.

e) A car traveling at constant velocity is an inertial reference frame.

Newton's first law: An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction if net force is zero.

So, for a) i think it is true because it ties in with the fact that an object will continuously move, unless a force acts on it

b) I don't think this one relates to it, but honestly not sure

c) not sure

d) ties in because an object at rest will remain at rest

e) true as well because it's in the same section of newton's first law in the textbook, and they state the same that if a ball is at rest in a plane moving at a constant velocity, then the plane is the inertial reference frame.

So could anyone help me out with the question?

Explanation / Answer

Inertia is NOT a force. Inertia is simply the tendency of an objects to resist a change in whatever state of motion that it currently has. Put another way, inertia is the tendency of an object to "keep on doing what it is doing." Mass is a measure of an object's inertia. The more mass which an object has, the more that it sluggish towards change.

Inertia (or mass) has nothing to do with gravity or lack of gravity. In a location where g is close to 0 m/s/s, an object loses its weight. Yet it still maintains the same amount of inertia as usual. It still has the same tendency to resist changes in its state of motion.

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