Thames & Kosmos Barbie STEM Kit: Science Saves the Day handleiding

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Rotating Shoe Rack

Back in the closet, Barbie and

Nikki stared at a mountain of

shoes and shoe boxes.

“You must walk a lot,” Nikki

said. “And run and dance and

horse ride. You have a pair of

shoes for everything!”

“It’s a lot, but I wear all of

them. If only it were easier

to ﬁnd the right pair when I

needed them,” said Barbie.

“Come on. We can organize

these shoes with a shoe rack

— even beer, a rotating

shoe rack,” Nikki said.

“That sounds great!” said

Barbie. “What’s the plan?”

“Well, the rack would rotate by season. The

same way the Earth rotates around the Sun

and makes our seasons change,” said Nikki.

“Because the Earth is tilted toward the Sun,

right?” asked Barbie.

“Exactly! When the top half of the Earth is

tilted towards the Sun, it’s summer in the

top half. At the same time, the boom half

is tilted away from the Sun, so it’s winter

in the boom half,” explained Nikki. “Then

the Earth rotates around the Sun, and the

seasons switch.”

“That makes sense. But how does that work

on a shoe rack?” Barbie asked.

“Summer shoes will be in front in the

summer, and winter shoes will be in the

back. Then we’ll rotate the rack when the

seasons change.”

“I think I got it,” Barbie smiled. “Let’s start

building.”

What causes day and night? Since the Earth is round,

the light from our Sun only illuminates one side of the

planet at a time. The side that the sunlight is hiing is

experiencing day, while the other half is experiencing

night. So, why isn’t one side of the Earth always day

and the other side night? Because

the Earth is actually spinning like a

top around an imaginary line called

an axis! This spinning motion, called

rotation, is the reason that the Sun

rises in the east and sets in the west.

One rotation of the Earth around its

axis is a day.

What causes the seasons? The axis that the Earth

is spinning on is not straight up and down but tilted. So

at one time half of the Earth, known as a hemisphere,

is tilted toward the Sun while the other is tilted away

from the Sun. The half that is tilted toward the Sun

experiences summer, and the half that is tilted away

experiences winter. The movement of the Earth around

the Sun in an

ellipse, called a

revolution, is what

causes the seasons

to change. One

revolution is equal

to one year.

WHAT’S

HAPPENING?

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