Question

http://www.usatestprep.com/modules/gallery/files/58/5880/5880.png
A wedge, which is used to split objects, distributes the force applied on its blunt face as shown in the image.

The distribution of force occurs because
A)
a wedge has three flat faces.
B)
the sides of the wedge are inclined.
C)
most of the force is absorbed by the blunt face.
D)
the applied force is felt only at the sharp edge.

Answer 1

It seems to me that choice A and B are stating the same thing in a slightly different manner. The triangular shape is what makes this object a tool which converts momentum into work at a given mechanical advantage. The mechanical advantage depends upon the angle between the two sides opposite the blunt side. A purely downward strike will cause the left side of the wood to move left and the right side of the wood to move right. If the wood is not completely split, there will be some elastic potential energy which will hold onto the wedge. Anyone who splits woods has experienced this. If completely split then the two pieces would move laterally with some velocity (with an amount of kinetic energy). I would argue that this point invalidates choice D since the sides are pushing outwards as the wedge moves downwards. Finally, I would say that the blunt edge does absorb some of the energy but only a component, in the form of a small amount of heat. Some energy is converted to sound, some to heat along the wood-wedge interface (due to friction), and some is converted into momentum of the wedge-wood system (ignoring any possible normal force-which would typically be present unless this was done in space). Unless I am misunderstanding the question, I don't believe this is a well written question.

Answer 2

Tell me about it

Answer 3

So out of all the answers which one would make the most sense

Answer 4

Cause that's my best guess right now

Answer 5

Oh good Lord, oh how I hate USA test prep. I would honestly pick C.

Answer 6

Ikr and thank you!