Model Car Design
CHALLENGE
Challenge 1
Time Allotment
10 minutes
Steps
Recite the Pledge of Allegiance and the Promise and Law.
Conduct any troop business.
Introduce Daisies to the Model Car Design Challenge badge.
SAY:
Today, you're going to be engineers as we start the Model
Car Design Challenge! You'll build model cars. Then you'll
test how far they roll on different surfaces. Next time, you'll
get to improve them based on your tests and race them
down ramps! Compare how the different balls rolled in
Activity 1: As Girls Arrive: Playing with Force and Friction as
examples of force.
SAY:
Let's get started and learn something important engineers
have to think about when they build things. When you were
rolling your balls earlier, what made the balls move faster?
(Answer: Rolling it with more strength or force.)
When you were rolling your balls earlier, what made the
balls move slower?
(Answer: Using less strength or force.)
Each time you rolled the ball, you changed the amount of
force you used. Force is the amount of strength or energy it
takes to move something. Explain friction to Daisies, using
the different balls used in Activity 1: As Girls Arrive: Playing
with Force and Friction.
SAY:
Were there any balls that were easier or harder to roll?
Why do you think that was?
Girls may say: It was hard to roll the tennis ball on the
carpet, the ping pong ball went the fastest, etc.
Each of the balls is made of a different material and
weighs a different amount. For example, the smaller
balls may have been easier to roll. Why do you think
that is?
(Answer: The smaller balls were lighter, so the surface
affected it less as it moved.)
When you roll the ball, there is something called
friction that stops the ball. Friction is a force that
slows and stops moving objects. Without friction, any
object that was pushed or pulled would keep moving
forever! Depending on the ball, there were different
amounts of friction at play. For example, there was
less friction on the smaller balls, allowing them to
move faster than big balls.
Have Daisies quickly predict how they think cars will
move on different surfaces.
SAY:
Do you think a toy car would move as fast on asphalt
as it would on carpet? Let's take a vote!
Have girls close their eyes and raise their hands to
vote "yes" or "no." Count the number of "no" and "yes"
answers, and tell the Daisies aloud how the troop
voted.
SAY:
Would anyone who voted "no" like to guess which
surface will allow the car to travel farthest or
fastest? Have the Daisies give ideas.
SAY:
Today, we'll use the GoldieBlox to find out!
MATERIALS:
Flag
Optional: Print out pictures of a
bicycle wheel (including brake pads),
a golf ball on a putting
green, a baseball player sliding, and a
sled loaded with supplies (or other
examples of friction)
Optional: Poster Board with the Girl
Scout Promise and Law
Activity 2: Opening Ceremony: All About Friction