Physics question

[ray1970]

Need some science help.

If two identical objects are launched at an identical velocity but one object weighs five pounds and the other object weighs three pounds, which one will travel the farthest before coming to a stop?

For example, if both the three pound and five pound object are both pushed to say 40 mph and you don't figure in anything like gravity or whatever, which one will travel the farthest distance before coming to a stop?

Hope that makes sense. If not, I can try to clarify.

Thanks.

[Great-Kazoo]

Which has more drop @ 25 or 50 yards. The 9mm or 45?

[ray1970]

Which has more drop @ 25 or 50 yards. The 9mm or 45?

Lol. That really isn't where this is going.

Let's assume the objects aren't flying through the air. Let's pretend they are bowling balls and they are rolling. If a ten pound ball was released at twenty miles per hour and a fifteen pound ball was released at twenty miles per hour which one would go farther before coming to a stop?

[mb504]

you don't figure in anything like gravity or whatever

If you are excluding gravity, air resistance, rolling friction, and etc, why would either one ever stop?

[MrPrena]

Need some science help.

If two identical objects are launched at an identical velocity but one object weighs five pounds and the other object weighs three pounds, which one will travel the farthest before coming to a stop?

For example, if both the three pound and five pound object are both pushed to say 40 mph and you don't figure in anything like gravity or whatever, which one will travel the farthest distance before coming to a stop?

Hope that makes sense. If not, I can try to clarify.

Thanks.

Assuming it is vacuum and surface area is insignificant (going back to General phys), x is independent to y.
both are falling at "g" (9.8m/s^2) at y axis in Cartesian coordinate regardless of it being 5lbs or 3 lbs. Meanwhile, both are traveling at 40mph at x-axis.
Key word here is same velocity traveling in x axis.
If you get into momentum or energy, it will have different story.

Last year, I use to tutor undergrad physics, chemistry, economics, finance, and some math.
For you, i will tutor you for a glock. (kidding)

[SamuraiCO]

If gravity, friction etc not affecting either ball there is nothing to stop either one. They both continue to travel until something stops their momentum.

Is that correct MrPrena?


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[MrPrena]

If gravity, friction etc not affecting either ball there is nothing to stop either one. They both continue to travel until something stops their momentum.

Is that correct MrPrena?


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Only thing it eventually stopping those 2 masses are gravity (g=9.8m/s^2) when it hit the ground some day.

Now, if those 2 items were thrown in the space without any gravity affecting it, it need reaction of same force to stop them.

[OldFogey]

Assuming both have equal energy inputs, the heavier ball would have to stop first. More energy required to move more mass. Assuming this is not in zero g space environment.

[JohnnyEgo]

Lol. That really isn't where this is going.

Let's assume the objects aren't flying through the air. Let's pretend they are bowling balls and they are rolling. If a ten pound ball was released at twenty miles per hour and a fifteen pound ball was released at twenty miles per hour which one would go farther before coming to a stop?

Taking your problem as presented, and with your assumption that no other forces (friction, air resistance, etc...) are applied, then the balls would be subject to Newton's first law of motion, also known as the law of inertia. Both objects would maintain their initial velocities (20mph) and neither would ever stop or slow down, as no other forces are acting upon them. This is what Mr. Prena said.

If we slowly step back from the idealized world, the first factor to come into play is force. It takes more force to get the 20 pound bowling ball up to the same velocity (20 mph) then the 15 pound ball. It will therefore take more force to stop the 20 pound ball. This represents the concepts of conservation of energy and momentum. One of the first forces to act against the balls will be rolling resistance with the surface. Assuming the coefficient of friction between both balls and the hard surface is the same, then it will take more exposure to the force of friction over time to make the heavier ball come to a stop. Thus, the heavier ball will roll further.

If you start adding in other factors, such as air friction, or movement up inclined planes, or surface elasticity, you start changing the sum of forces acting on the balls, and you can contrive a situation where either ball rolls farther.

[SuperiorDG]

If you are excluding gravity, air resistance, rolling friction, and etc, why would either one ever stop?

This ^^^