Sledding on Grass – fun investigation about friction and sledding on grass and snow.

Sledding on Grass – fun investigation about friction and sledding on grass and snow.


So usually you sled on snow, and you slide
very quickly to the bottom. We were wondering what happens if we sled
on the same hill, when there is no snow… just grass. What do you think? Will we go faster, slower, or not at all? Make your prediction while you hear the music. *Music playing* Here’s our predictions… That we are going to slide even though there’s
not snow. We probably will slide, but we probably won’t
go all the way. Like, as far as we would for snow. Now you try it, find a hill and try to sled. Here’s what we found… We didn’t go anywhere. Why did we not go so far or as fast while
sledding on grass? The answer is….Friction! Friction is a force that holds back or slows
down a sliding object. On the hill with snow, gravity is pulling
us to the center of the earth– so we are pulled down the hill, the sled rubs against
the snow. And because the snow is smooth, it doesn’t
create very much friction, so , it doesn’t slow down the sled very much and you speed
to the bottom. But when we put that same sled on the same
hill and it is covered with grass, what happens? Gravity is still pulling us to the center
of the earth, so we feel the pull down the hill, but the sled is rubbing against the
grass, and because the grass is so bumpy compared to the snow, a lot of friction is created. So the force of gravity pulling down is canceled out by the force of friction holding us back
and plop. We don’t go anywhere. To explore the force of friction all around
you, here’s our Explore More challenge for you… What happens if
What would happen if we sled in the rain? We also wanted to know what happened if we
sledded down the slide. If you do this, be very careful and have an
adult at the bottom ready to make sure you don’t hurt yourself. Try sledding or sliding on different surfaces
and let us know what you find out about friction, do you go slower or faster? Post your answer in the comment section below. Try to use the word “friction” in your
post. We can’t wait to see what you tried and
how it went. Until next time my friends. Explore More.

Antonio Breitenberg

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