Video Transcript
Which is lighter, a tree or a bunch
of grapes?
In this question, we’re shown two
objects, and we’re asked to compare them. We’re not comparing their size or
their color. Instead, we need to compare how
heavy they are because our question asks us, which is lighter? Lighter is one of two words that we
can use to compare the weight or the mass of objects. And when something is lighter than
something else, it weighs less. The other comparing word we often
use is heavier. This is when an object weighs
more. But our question asks us, which is
lighter? Which weighs less, the tree or the
bunch of grapes?
Now, you may have picked up a bunch
of grapes before, but I’m pretty sure you haven’t picked up a whole tree. So how can we compare the weight or
the mass of these objects. Well, in a way, what we’ve just
said is a really big clue. Why haven’t you ever picked up a
tree? Well, one of the reasons might be
that it’s really, really heavy. A bunch of grapes is much lighter
than a tree. Although grapes don’t grow on
trees, they grow on plants that are a little bit like trees, where lots and lots of
grapes grow together. So one bunch of grapes is
definitely going to weigh a lot less than a tree.
We’ve used what we know about these
objects to compare their weight or their mass. We know the tree is heavier than
the bunch of grapes. And so we can also say the bunch of
grapes is lighter than the tree.
