What are rapid flows of mixtures of rocks or soil and water?

What are rapid flows of mixtures of rocks or soil and water? Mudflows and debris flows are rapidly-moving mixtures of soil, rocks, and water. Mudflows are made up of mostly fine grains; debris flows are made up of mostly coarse grains. Debris flows have occurred several times in human history in the Blue Ridge. What […]

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What is the difference between a car hitting a wall versus a car hitting a haystack?

What is the difference between a car hitting a wall versus a car hitting a haystack? When a car is out of control, it is better to hit a haystack than a concrete wall. Physics reason: Same impulse either way, but extension of hitting time reduces the force. What would happen to the momentum of

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