is it easier to break a softer clay pigion than a hard one?
100979
No, I think when you hit either of them they break. Maybe that is just an excuse for people who miss.
518951
The yield stress is actually more valuable for design. You never want to exceed the yield stress of a material (unless you need it to fail for some reason). Comparing the yield stress with the ultimate stress can give a quick idea of how brittle the material is. \n\nThe working stress is usually set to some fraction of the yield stress. For example customers will often require that the maximum working stress not exceed 2/3rds of the minimum allowed yield stress for the material.
312943
Press harder but not too hard.
828414
We are dealing with an illusion caused by grain size and moisture content here.  In fact sand is quite hard because it is made up of individual rock and mineral grains.  Limestone and quartz are pretty hard materials.  If a sand is damp, or has very small rounded grains, it can feel soft to the hand however.\n\nClays on the other hand are soft because they are created by the chemical weathering of other minerals (such as pyroxene or feldspar) and the individual clay units are microscopic in size.  Clays usually contain a high proportion of water in their structure as well (it can be as high as 70%).\n\nWhen a geologist in the field can't make out the whether a rock is a siltstone (clastic) or clay (chemical) because the grain sizes are too small to see, a simple test is to break off a small fragment put it between ones teeth.  If its chewy and soft, its a clay.  If its hard and gritty, its a silt. \n(Warning - experts only folks.  Some rocks contain poisonous minerals so don't go around randomly tasting rocks.)
351774
well... its on the "easy side".... I wouldn't recommend anyone giving themselves up that easy..... But it can be hard in a situation of pure pressure, just learn from your mistake; and you'll be coming out ahead.
739716
Too easy, give me a harder one.
853580
It's softer - hence less friction hence no spark
108634
Polycarbon is lighter, easier to form in curves, and usually cleaper.\n\nGlass is more durable (difficult to scratch) and can be tempered so that it's won't form dangerous shards if broken.
693931
While they can be equal in hardness one would normally find that the granite, being of igneous origins, is more chemically bonded and therefore more difficult to break apart.  However, the individual minerals within the granite may be harder or softer than the sandstone which is usually composed of quartz which has a hardness of 7.  If the sandstone is porous, it will not take extreme cold well at all as any moisture inside the pores will freeze and thereby facture the rock.The granite doesn't have this problem.
1011052
some are soft while others are semi-solid.  The recipe usually does not specify the consistency.
642575
1.  Moderately hard\n2.  Moderately easy
1147590
use some nail hardner
492924
i'm not exactly sure, but i would think that it would depend on the soil composition.  after all a fine clay has much different properties than a sandy or rocky soil
837963
Not that I know of, but it seems like the hard ground would be for, well, really hard ground.  Firm ground seems more all-terrain like you said, as it is saying that it operates in harder ground, but not mud and slush.  Soft ground will kill you, so don't get it.  The ground at our soccer fields was complete trash and was pretty hard, and one kid wore metal spikes (which are for soft ground so they can dig in) one day.  From that day alone, he got shin splints and had to sit out for a week and a half or two.\n\nI suggest the firm ground.
387772
A hammer or a stiff one!!!!
402913
well, I don't know about the testing, but for design, you use 0.4Fy as your shear strength. If you have 36 ksi steel, then you need 14.5 ksi to create a shear failure. Don't know if that works forpunching holes; it's probably less. Good question.
32045
According to the Mohs scale, diamond is the hardest mineral.  I believe that a harder mineral can scratch a softer mineral as well as itself.  So that would work.