why does a child in a wagon seem to fall backward when you give the wagon...

why does a child in a wagon seem to fall backward when you give the wagon a sharp pull forward??

Expert Solution

It really has nothing to do with gravity. Gravity is indirectly part of the solution, because it keeps the child in contact with the wagonbed so that traction (static friction) can still act upon him.

It has to do with inertia. There needs to be a force acting on a body to cause it to accelerate when its immediate environment accelerates...otherwise that body remains at the previous velocity.

For the child in the wagon, there IS said force (otherwise he would fall off the back and wouldn't be very happy), and that force is traction with the wagonbed as well as normal force of contact with the back wall. BUT, those forces are LOCALIZED at the bottom side of the child. The top of the child's body receives the force less directly, and relies upon the body re-orienting to provide it via tension in the child's bones. The steady state position is such that the child's body is "thrown backward" to be slanted backward.

genius_generous answered 2 years ago

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