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Grade 11 · Science · Physics

11th grade SI units, prefixes and checking units worksheet

6 printable versionsChallenge Me10 questions · answer keyFree · no account

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SI units, prefixes and checking units

Grade 11 Science Worksheet - Challenge Me

NameDate

Circle the best answer, or write your answer on the line.

  1. A 250 g toy moves at 6 m/s. Using KE = ½mv² in SI units, what is its kinetic energy, Ari?

  2. A 60 g toy moves at 5 m/s. Using KE = ½mv² in SI units, what is its kinetic energy, Bo?

  3. A 150 g toy moves at 2 m/s. Using KE = ½mv² in SI units, what is its kinetic energy, Esme?

  4. Using the quantity boxes, what are the SI base units of ½mv², Jun?

    • kg·m²/s
    • kg·m/s², a newton
    • ½ kg·m²/s²
    • kg·m²/s², a joule

  5. Milo says that if an answer's units are right, the answer must be right. Agree or disagree?

    • Disagree: a missing ½ still passes
    • Agree: matching units mean a right number
    • Agree: units can be dropped once the number is found
    • Agree: milli- means a thousand

  6. Noah says the kilogram, not the gram, is the SI base unit of mass. Agree or disagree?

    • Disagree: mass has no base unit
    • Disagree: a base unit can't carry a prefix
    • Agree: the kilogram is the base unit
    • Disagree: the gram is the base unit

  7. Pia says 5 m + 3 s = 8. Agree or disagree?

    • Agree: the answer is 8 m/s
    • Disagree: meters and seconds can't be added
    • Agree: just add the numbers
    • Disagree: it is 15 m·s

  8. A classmate converts 5.0 km/h to m/s as 5.0 × 3.6 = 18 m/s. What went wrong, Ren?

    • Divide by 3.6: about 1.4 m/s
    • Multiply by 1000 and stop
    • km/h and m/s are the same unit
    • Nothing; the units check out

  9. A classmate writes 4 mm = 4000 m. What went wrong, Tala?

    • Milli- is a thousandth: 4 mm = 0.004 m
    • It should be 400 m
    • Nothing; milli- means a thousand
    • It should be 40 m

  10. A classmate gets a car's kinetic energy as 1200 kg·m/s. What does the unit show, Zee?

    • Nothing; units don't matter
    • It should be in newtons
    • It is already in joules
    • v was not squared
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11th grade SI units, prefixes and checking units worksheet – printable
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About this worksheet

SI units, prefixes and checking units. Every version has 10 questions, and the answer key prints on the second page.

What your child will learn

  • I can name the seven SI base units (m, kg, s, A, K, mol, cd). I know the kilogram is the base unit of mass, and that the newton, joule, watt and pascal are derived.
  • I can convert with prefixes from giga- to micro-, and convert km/h to m/s by changing both kilometers and hours.
  • I can build a derived unit from a formula (N = kg·m/s², J = kg·m²/s², W = kg·m²/s³, Pa = kg/(m·s²)). I can use units to check an equation or catch a slip.

Standard: practices (no PE)

Words to know

SI base unit: One of seven units every other SI unit is built from

derived unit: A unit built from base units, such as the newton

prefix: A power of ten in front of a unit, such as milli-

unit analysis: Carrying units through a calculation to check it

scientific notation: A number written as a value times a power of ten

Common mistakes

Your child divided where they should multiply (or the reverse).

Your child multiplied by 3.6. 1 m/s is 3.6 km/h, so going from km/h to m/s means dividing by 3.6.

Your child changed kilometers to meters but left hours as hours. Both parts of the unit must be converted.

What to say

Ask: is a meter bigger or smaller than this unit? Then check the answer's size.

Questions parents ask

What is the most common mistake with si units, prefixes and checking units?

Your child divided where they should multiply (or the reverse).

How can I help my child with si units, prefixes and checking units?

Ask: is a meter bigger or smaller than this unit? Then check the answer's size.

Are these 11th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

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