![]() There is a lump of metal in a building near Paris that has served formany years as the standard kilogram. If you were stranded on a desert island and wanted tostart from scratch, you could just pick up any convenient rock, set it aside and use thatas a standard mass. I doesn't matter when, how, or where it isdone, but that's the first step. It is necessary to establish a standard mass. This probably seems akin to the miracle of theloaves and fishes! Yet we have so far notexplained how to get a quantitative operational definition of either mass or force.Somehow, from this one expression, we are going to figure out an operational measureof both of those undefined quantities. when the velocity is momentarily zero while the cart is changing frommoving in the negative direction to the positive direction.įorce and MassThe equation F = ma is one of the most important in physics.when it is going in the negative direction and is slowing down and.when the cart is going in the positive direction and is speeding up,.As the cart passes through point B, even though thevelocity is momentarily zero, the positive acceleration never ceases as it turns aroundand accelerates towards the positive end of the track. The acceleration is positive because thenegative velocity decreases. ![]() When the fan is pointed in the direction of the shove,the force is positive and the cart slows down.
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