Virginia SOL 2.1.b.iii

Science2nd GradeScientific and Engineering Practices

The Standard

measure time intervals using proper tools

Virginia Standards of Learning for Science · The student will demonstrate an understanding of scientific and engineering practices by

Teacher's field guide

What Students Need to Do: Students choose a stopwatch, timer, or clock to measure how long an event lasts. They start and stop the tool at clear points, then record the duration with the correct unit.
What Mastery Looks Like: Students can plan repeated trials and measure each trial from the same starting and ending points. Their records include sensible durations and labels such as seconds or minutes.
Common Misconceptions: Students may record the clock time instead of the amount of time that passed. They may start late, stop early, confuse seconds with minutes, or change the start and end points between trials.
How to Assess It: Ask students to time a partner stacking 10 cubes twice, record both durations in seconds, and explain when they started and stopped the timer.

Lesson moves

Release a toy car down a ramp three times, timing each run with a stopwatch and recording the results in seconds.
Ask students to write which tool they would use to time a sneeze, a song, and recess, then explain each choice.
Play Timer Match by pairing event cards with tool and unit cards, such as stopwatch and seconds for tying a shoe.
Time a classroom cleanup, compare the duration across three days, and discuss what changed while keeping the starting and ending points the same.

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