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WHY?
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Probably the most basic thing that we notice about the force of
gravity on ourselves and the things around us is that the force on
ourselves and the things around us is that the force is different for
different objects. Some things weigh more than others. An adult weighs
more than a baby. Gravity pulls strongly on some things, and weakly on
others. Weight is often connected with size, but it is not only size, it
is the total amount and kind of material or matter that decides an
object's weight. The amount of matter that includes its size, kind, and
how it is packed is mass. The greater the mass, the greater the force of
gravity on that object. Matter resists being accelerated. The greater
the mass, the greater the force that will be needed to accelerate it. We
also discover that matter has another property, as well. It is attracted
by gravity. The more matter there is, the greater is the force of
gravity on that object.
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ASSESSMENT: Can the student communicate
what they observed?
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