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Grade 8 · Science

8th grade Solve for speed, distance or time worksheet

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Solve for speed, distance or time

Grade 8 Science Worksheet - Challenge Me

NameDate

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

  1. Ari and a friend start 120 m apart and walk toward each other at 2 m/s and 4 m/s. After how many seconds do they meet?

  2. Bo bikes toward a friend who is 240 m away, at 3 m/s. The friend bikes back at 5 m/s. How many seconds until they meet?

  3. Jun walks at 2 m/s. A friend starts from the same spot 10 s later, at 3 m/s. How many seconds after the friend starts do they catch up?

  4. Kira bikes at 6 m/s. A friend leaves 10 s later from the same spot at 9 m/s. How many seconds after leaving does the friend catch up?

  5. Luz rides a scooter at 4 m/s. A friend sets off 15 s later at 5 m/s from the same spot. How many seconds after setting off does the friend catch up?

  6. Milo's robot drives 60 m in 20 s, rests for 10 s, then drives 40 m in 10 s. What is its average speed for the whole trip?

  7. Noah skates 30 m in 10 s, stops for 4 s to tie a lace, then skates 24 m in 6 s. What is the average speed for the whole trip?

  8. Ren says the cart's speed is a steady 8 m/s, since 32 ÷ 4 = 8. What does the table show?

    • The cart's speed is 32 m/s, the distance at the end
    • The cart speeds up; 8 m/s is only its average
    • The speed is steady, since the distance rises every second
    • The cart slows down, since each second adds a larger distance

  9. Read this first

    Use this

    Investigation card (test results). Changed: none; the same run is repeated. Measured: time to roll 1 m (s). Kept the same: same car, same track. Run 1: 0.8. Run 2: 1.0. Run 3: 1.2.

  10. The car rolls 1 m each run. Tala says its speed is exactly 1.25 m/s, from run 1. Which speed do all three runs support best?

    • About 1 m/s, from the mean time of 1.0 s
    • About 0.33 m/s, from 1 m over a 3.0 s total time
    • Exactly 1.25 m/s, since the first run is cleanest
    • About 0.8 m/s, from the slowest run

  11. Cart on two surfaces (example data)

    surfacedistance rolled (m)trial 1 (s)trial 2 (s)trial 3 (s)
    smooth floor21.92.02.1
    carpet22.42.52.6

  12. A cart rolls 2 m on each surface. Which conclusion is best supported by the three trials, Zee?

    • The carpet was faster, since its times were bigger
    • Faster on the smooth floor: about 1 m/s against 0.8 m/s
    • The speeds were the same, since each trial took about 2 s
    • The cart's speed on the floor is 2 m/s, since it rolled 2 m
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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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