Posted by Soly on Sunday, September 9, 2007 at 9:19pm.
yes and yes
For the first one, look up weight and the gravitational force of the earth.
For #2, inertia is ok but the reasoning is wrong. The bus is moving a some speed and the passengers in the seats are moving at the same speed (perhaps I should be saying velocity). When the bus slows down to, say, half that speed, the passengers still are going at the original speed so they try to move forward. That's why the lurch is forward. That's why a head on collision is so deadly. The two cards stop within the blink of an eye BUT the two drivers of the two vehicles keep moving--often through the windshield.
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