If you lay the ladder down on the ice then crawl along it, your weight is spread over a larger area and the ice is less likely to break. If someone is holding the ladder, it gives you something to pull yourself out with if it does break.
When you crawl you have at least 4 points of contact with the ice which means your weight is more spread out than walking which has 1-2 points of contact that has a larger chance of breaking the ice. Rule of thumb for Ice is it must be at least 4 inches to be safe.
It depends how much ice and how much balsa wood you have.
Ice cubes float in water because they are less dense than liquid water. The solid water molecules in ice are spaced farther apart than the molecules in liquid water, causing the ice to be less dense. This difference in density allows the ice cubes to float on the surface of the water rather than sink.
Ice is less dense than water at the same pressure. That is why ice cubes and icebergs float on the water.
Ice has a LOWER density than water as ice FLOATS in water!!!!!!! Upon freezing water to form ice, expansion occurs thus more volume and surface area but the same weight.
If you laid the ladder flat on the ice and wanked on the ladder rather than the ice, then your weight would be spread over a much larger area than that of just your feet. It would then be less likely that you would break the ice yourself.
To determine if ice is safe to walk on, check its thickness. Safe ice for walking should be at least 4 inches thick. Use an ice auger or drill to measure the thickness in different spots. Clear, solid ice is safer than cloudy or slushy ice. Always consider the temperature and recent weather conditions when assessing ice safety.
Because it's slippy and you would just fall over
Ice is seriously more slippy.
Step on the ice and slide across the big sheet like a skating rink to get to the ladder use the rocks to help you change direction.
I think combination locks are safer since key locks are easy to break into with a knife or a ice prick to unlock the key lock.
Ice
Rock salt because it is a larger, coarser salt than table salt. It is also safer than salt water because it will provide a surface to walk on. Salt water still has the ability to freeze, so it is not a good de-icer.
Rubber has more friction than an ice cube. Ice has almost no friction what so ever.
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If you suspect the ice may be thin the ladder will distribute your weight across a larger surface.
you push all the rocks down the holes using strength and than use the ladder to go down a floor than slid ur way through :)