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Week 11 · Lift It

Wednesday

Build lever version 1
// A lever or pulley that lifts a small load
⏱ about 20 min

Wednesday: Build Lever Version 1

Rocket sets the marker right in the middle of the ruler.

He tapes the load cup on one end, with 6 coins inside.

An empty push cup goes on the other end.

Nova counts coins into the push cup. "One, two, three..."

Raven watches the load cup closely.

You need

  • A ruler
  • A round marker for the fulcrum
  • 2 small paper cups
  • Tape
  • A pile of coins, all the same kind
Safety first
Coins can choke little ones. Keep them away from babies.
Nothing goes in your mouth.
Keep faces away from the ruler ends. They can flip up fast.

Build and test

  1. Tape the marker to the table so it does not roll.
  2. Lay the ruler across the marker.
  3. Tape a cup to each end of the ruler.
  4. Put 6 coins in the load cup.
  5. Add coins to the push cup until the load lifts.
VersionWhere is the fulcrum?Push coins needed
Version 1
MEASURE EFFORT
  • Read the question.
  • Tap your answer.
When do you stop adding push coins?
KEEP IT FAIR
  • Read the question.
  • Tap your answer.
Why keep 6 coins in the load cup every time?

Why tape the marker?

A round marker can roll away.

If it rolls, the fulcrum moves.

Then the test would not be fair.

Tape keeps the fulcrum in one spot.

BUILD CHECK
  • Read the question.
  • Tap your answer.
Where did Rocket put the fulcrum?
Why tape the marker to the table?
How do you add push coins?
SafetyTrue or false?
Keep coins away from babies.?
Put your face close to the ruler end.?
Ruler ends can flip up fast.?
Coins are fine in your mouth.?
WHY THIS EXERCISESafe builders watch out for flipping parts.
TEST THE LEVER
  • Tap a card.
  • Then tap its spot.
1First
2Next
3Then
4Last
Try it
Build your lever with a grown-up.
Put the fulcrum in the middle first.
Count the push coins it takes.
LeverTrue or false?
The marker is the fulcrum.?
The push cup holds the load.?
The ruler is the stiff bar.?
WHY THIS EXERCISENaming the parts helps you plan changes.

Your lever is working!

Tomorrow, we look at the count.

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