00:02
To a tennis ball in each of these situations.
00:03
So the first one we're going to be rolling down and open space.
00:07
So we're rolling down, which means there's going to be nothing to hinder the ball.
00:12
So as it rolls down, it's just going to continue to roll down that space.
00:17
It's not going to change directions except vertical direction.
00:20
It will be changing directions vertically because it's going down.
00:24
It will be changing directions horizontally because it's going across the hill, but it's not going to be changing left or right.
00:32
So let's look at b when we're looking at rolling towards a wall.
00:36
So we're going to have on a flat ground, and it's going to roll towards the wall.
00:42
So let's see what's going to happen as it goes towards that wall.
00:44
Well, it's going to roll towards the wall, and then when it gets to the wall, it's going to reverse directions and go back.
00:52
Okay...