Pushes and Pulls
Grade 2 - Science - Challenge Me
A class tests a pull on a drawer to open a sticky drawer without spilling markers. What design problem are they solving?
- help a classroom door close quietly
- slide a supply box under a table safely
- open a sticky drawer without spilling markers
- move supplies across snow without tipping them
Which criterion should the drawer design meet?
- close the door without a loud slam
- make the swing move a small safe distance
- stop within one step of the cone
- open smoothly while markers stay in place
What evidence should students record while testing the push design for the box?
- whether the box stayed inside the tape lines
- how many words are in the problem
- which object name is longest
- whether the object has a bright color
Test result: The two-hand push moved the box straightest. What improvement should the team try next?
- test a cardboard guide along one side
- mark the starting spot and repeat the test
- test a slower push with the same hand position
- test a slightly weaker push from the same line
Which claim uses the swing test evidence correctly?
- The criterion should change after every guess.
- The team should choose without testing.
- A push or pull test cannot have evidence.
- The light push made the smallest controlled motion, so the team can compare how well the design meets the criterion.
A class tests a pull on a wagon to move books to the reading corner without dropping them. What design problem are they solving?
- start a swing gently for a younger child
- move books to the reading corner without dropping them
- slide a supply box under a table safely
- move supplies across snow without tipping them
Which criterion should the wagon design meet?
- make the swing move a small safe distance
- carry all the books on the taped path
- stop within one step of the cone
- close the door without a loud slam
What evidence should students record while testing the pull design for the wagon?
- which student likes the idea most
- whether the object has a bright color
- how many books stayed in the wagon
- which object name is longest
Test result: The handle-pull design kept the books inside in three trials. What improvement should the team try next?
- test a cardboard guide along one side
- attach the rope closer to the center
- try a wider turn around the table
- mark the starting spot and repeat the test
Which claim uses the drawer test evidence correctly?
- The object name alone proves the design worked.
- The slow pull opened the drawer with no spilled markers, so the team can compare how well the design meets the criterion.
- The criterion should change after every guess.
- The team should choose without testing.