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8th grade Solve for speed, distance or time worksheet

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Solve for speed, distance or time

Grade 8 Science Worksheet

NameDate

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

  1. A bus drives 720 m at a steady 36 km/h. To change km/h to m/s, divide by 3.6. How many seconds does Ari's ride take?

  2. A train carries Bo 360 m at a steady 72 km/h. To change km/h to m/s, divide by 3.6. How many seconds does that take?

  3. Jun walks 60 m at 2 m/s, then jogs the next 60 m at 6 m/s. What is the average speed for the whole trip?

  4. Luz's scooter goes 120 m at 4 m/s, then 120 m at 12 m/s. What is its average speed over the whole 240 m?

  5. During which interval is the object's speed greatest, Milo?

    • 10 to 20 s, when the object is 20 m from the start
    • 20 to 30 s, which gains 30 m in 10 s, the steepest piece
    • The three are equal, since the line does not go down
    • 0 to 10 s, since it is the first piece

  6. What is the object's average speed over all 60 s, Noah?

    • 60 m/s, since the highest point is 60 m
    • 3 m/s, the speed of its first piece
    • 2 m/s: it travels 60 m out and 60 m back in 60 s
    • 0 m/s, since it ends where it started

  7. How far does the object travel between 5 s and 20 s, Pia?

    • 30 m, its distance from the start at 20 s
    • 15 m
    • 45 m, the distance of the first two pieces
    • 0 m, since the object is stopped from 10 s to 30 s

  8. Read this first

    Three runners (example data)

    runnerdistance (m)time (s)
    A12020
    B15030
    C9018

  9. Each runner kept a steady speed. Which runner is fastest, Ren?

    • B, since B ran the farthest of the three runners
    • C, since C took the least time of the three runners
    • The three are equal, since each of them ran steadily
    • A: it runs 6 m/s, while B and C each run 5 m/s

  10. Two riders (example data)

    travelerspeed
    cyclist12 km/h
    runner4 m/s

  11. A cyclist rides at 12 km/h and a runner at 4 m/s. Who is faster, Tala?

    • The runner: 12 km/h is about 3.3 m/s, under 4
    • They are equal, since 12 divided by 3 is exactly 4
    • The cyclist, since 12 is more than 4 in the table
    • Cannot tell, since the two units are different

  12. Two robots (example data)

    robotwhat was measured
    P300 m in 2 min
    Q3 m/s

  13. Robot P rolls 300 m in 2 min. Robot Q rolls at 3 m/s. Which robot is faster, Zee?

    • They are equal, since both robots roll steadily
    • Q: P's speed is 2.5 m/s, which is less than 3 m/s
    • P, since it rolled 300 m, the longer distance
    • P, since 150 is more than 3 in the table
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8th grade Solve for speed, distance or time worksheet – printable
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About this worksheet

Solve for speed, distance or time. Every version has 10 questions, and the answer key prints on the second page.

What your child will learn

  • I can find how far something goes from a point on its graph, and the speed between two readings that do not start at zero (change in distance ÷ change in time).
  • I can read a distance-time graph: a flat piece is a stop, a falling piece is coming back, and the steepest piece is the fastest.
  • I can change km/h to m/s and use it to find a time, and I can find an average speed as total distance ÷ total time, with stops counted.
  • I can compare two rates written in different units, and work out when two moving things meet or when one catches the other.
  • I can say when one number (an average, or one run) hides a change in speed or a spread in the data.

Standard: supports MS-PS2-2

Words to know

speed: How far something goes each second (or hour)

velocity: Speed together with the direction of motion

average speed: Total distance divided by total time, rests included

distance-time graph: Time across, distance from the start up; steeper means faster

m/s, km/h: Meters each second; kilometers each hour (divide km/h by 3.6 for m/s)

Common mistakes

Your child stopped at the speed. The question asks how far the object goes, so multiply the speed by the time.

Your child added the extra seconds to the distance. A steady speed adds the same meters every second, so multiply.

Your child divided the later distance by the later time. When the first reading is not zero, use the change in distance over the change in time.

Questions parents ask

What is the most common mistake with solve for speed, distance or time?

Your child stopped at the speed. The question asks how far the object goes, so multiply the speed by the time.

Are these 8th 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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