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## Answers (2)

Your question is a bit vague! Are heavier objects more resistant to what?

I’ll make some assumptions and if I do not answer your question, perhaps you could ask it again more clearly.

I will assume that you intend to ask, “Are heavier objects more resistant to changes in motion?”

The short answer is, “Yes, heavier objects are more resistant to changes in motion”. This is something Newton observed and from which he developed the second law of motion.

Whenever an object changes its motion we call it acceleration. So, ‘acceleration’ is a fancy way of saying ‘changing motion’. There are three ways an object can accelerate: It can speed up, it can slow down, and it can change its direction.

Newton figured out that the only way for any of these three things to happen is if a force is applied. He expressed this in this equation: a = F / m. In English this says, “The acceleration of an object is equal to the force applied to the object divided by its mass.

Another way of saying this is to say that the greater the force applied to an object the greater its acceleration and the greater the mass of the object the more force is needed to make it accelerate.

Your second question is asking why it takes more force to change the motion of a more massive object. The easy answer is, “because the more mass an object has the more inertia the object has. The more inertia an object has the more difficult it is to cause the motion of that object to change.”

Sounds pretty scientific doesn’t it? But do you know what? No one knows why objects with more mass have more inertia! Indeed, no one knows why objects with mass have any inertia at all! Even though we can define inertia (the resistance to changes in motion) no one knows why this is so!

Now, let me re-examine you question. You might be trying to ask if heavier objects fall faster or slower than lighter objects. The best way to answer this question is to try it! See of you can find a heavy ball and a lighter ball. They will hit the ground at the same time if you drop them from the same height at the same time.

This sounds like it contradicts what I said above! Well, take a look at the equation a = F / m. If the force is the weight of the object then no matter what object you have if you divide its weight by its mass you will always get the exact same acceleration! This is why heavy objects do not fall faster than lighter objects.

By heavier objects I will assume you mean denser. As 10 pounds of feathers will be heavier then 1 pound of feathers, the larger pack of feathers will be heavier.

So assuming you mean denser objects, denser objects are more resistant to certain things such as radiation, you would want a radiation barrier to be made out of 1 foot of lead then 1 foot of feathers because the lead will be much denser and its dense loaded atomic structure allows it to absorb the effects of radiation better.

In short wieght does not determine resistance. At least chemically.