Pushes and Pulls
Grade 2 - Science - On Level
A class tests a pull on a cart to turn a supply cart around a corner. What design problem are they solving?
- slide a supply box under a table safely
- turn a supply cart around a corner
- roll a ball to stop near a target cone
- open a sticky drawer without spilling markers
Which criterion should the door design meet?
- move the box without hitting the table legs
- close the door without a loud slam
- open smoothly while markers stay in place
- carry all the books on the taped path
What evidence should students record while testing the push design for the box?
- how many words are in the problem
- whether the box stayed inside the tape lines
- which student likes the idea most
- which object name is longest
Test result: The slow pull opened the drawer with no spilled markers. What improvement should the team try next?
- move the strap lower and test again
- test a cardboard guide along one side
- test a slower push with the same hand position
- test a pull from the center of the knob
Which claim uses the swing test evidence correctly?
- The light push made the smallest controlled motion, so the team can compare how well the design meets the criterion.
- The team should choose without testing.
- A push or pull test cannot have evidence.
- The criterion should change after every guess.
A class tests a push on a door to help a classroom door close quietly. What design problem are they solving?
- move books to the reading corner without dropping them
- open a sticky drawer without spilling markers
- help a classroom door close quietly
- move supplies across snow without tipping them
Which criterion should the wagon design meet?
- close the door without a loud slam
- stop within one step of the cone
- reach the marker with all supplies still on the sled
- carry all the books on the taped path
What evidence should students record while testing the push design for the soccer ball?
- distance from the ball to the cone
- how many words are in the problem
- which object name is longest
- whether the object has a bright color
Test result: The side-strap pull made the cleanest turn. What improvement should the team try next?
- move the strap lower and test again
- test a cardboard guide along one side
- test a slower push with the same hand position
- test a slightly weaker push from the same line
Which claim uses the cart test evidence correctly?
- The side-strap pull made the cleanest turn, 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.
- The object name alone proves the design worked.