Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
Trending News
If an object inside a truck weighs between 300 and 3000 lbs, on a 4' x 4' skid, less than 4' high, and the truck has no abnormal torque...?
...what force on earth would cause the object to move rearward in a forward moving truck?
I'm looking for a real life scenario here, so friction is a given in the parameters described and not likely to be simply ignore-able.
....ALSO... bumpy or not, coming to a stop (even a panic stop) or going downhill, no matter how steep, would not cause the item to move backward in a forward moving vehicle. That is just common sense. A rearward moving vehicle however, it might.
accelerating uphill on a bumpy road... that has merit.
3 Answers
- sojsailLv 74 years ago
Assuming the real world, there will be friction. If the truck is accelerating on a bumpy road or driving on a bumpy uphill road, that could happen. Have to then assume it is never bumpy when coming to a stop or going downhill.
- 4 years ago
Well asked indeed..
Let's see. We'll take two frames from where we'll observe. The question does not mention friction so we'll just ignore it.
First the ground frame of reference. In this frame no force acts on box in horizontal direction and the truck moves forward so it's clear that the box remains where it was and finally falls from the rear end.
Now from the truck's frame. Imagine getting fixed on the truck do that we don't slip like the box or friction acts on us but not on the box. In this frame we'll have to introduce a pseudo force to keep observation in accordance with Newton's laws. So that pseudo force will make the box move.
Enjoy....
PostScript: inertia is a tendency not a force.
