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Heavier objects move downhill faster than lighter objects because the effects of friction and aerodynamic resistance are reduced by higher mass.

If two carts are subject to the same gravitational acceleration (9.8m/s^2 at sea level on Earth), wind resistance, and ground friction, the cart with more mass will gain kinetic energy faster and will be better able to overcome the drag forces that accompany acceleration.

This assumes that both carts are the same size. If one cart is twice as heavy because it is twice as large, then the larger cart would be subject to more air resistance and possibly more ground friction.

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13y ago
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9y ago

Gravity pulls each person the same, which was proved by Galileo. What makes the heavier person go faster is the fact that the heavier person is harder to slow down because of their added mass. Friction has less of an effect on the heavier person.

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12y ago

Rolling is more complicated than falling. The angular momentum of an object depends not only upon the speed of rotation and the mass, but also upon the location of the center of gravity of that object; as the mass become farther from the axis of rotation, it will have more angular momentum for a given speed of rotation. So the shape of the object matters, and the distribution of mass in an object that is not uniform in composition. But let's say that you have two objects of exactly the same shape, and uniform density, both homogeneous spheres, for example, but one is heavier than the other. In that case the result is the same as for dropped objects; the increased mass causes an increase in inertia that exactly matches the increase in gravitational force, so that the acceleration is the same.

If we consider air friction as well in this case (where the objects are completely identical except their weight), then the heavier object will be faster.

The air friction is the same for both objects, but the heavier object will be less affected by this due to its larger inertia.

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11y ago

Nope, the earth's gravity accelerates all (well, masses that are too small to move the earth itself) masses at the same rate ≈ -9.8 m/s/s. Whether it is rolling, sliding, or falling. See the related link for more information.

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12y ago

Neglecting effects other than gravity, F=ma, or F=mg.

Look up Galileo, mass, gravity, inertia and tower of Pisa and figure it out for yourself.

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11y ago

They go the same all objects accelerate at 9.8 meters per second squared

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Q: What goes faster down a hill a heavy ball or a light ball?
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