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Grade 8 Kinetic & Potential Energy Worksheet with Answers

Grade 8 (US) · Year 9 (UK) · Class 8 (India) · Science

Unit 3: EnergyKinetic & Potential EnergyNGSS MS-PS3-1

Calculating kinetic energy (½mv²) and gravitational potential energy (mgh). This free middle school worksheet has 12 questions and a full answer key. Print it or save it as a PDF — every answer is checked by code, not guessed.

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Kinetic & Potential Energy

Grade 8 · Science

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Learning goal: Kinetic & Potential Energy · NGSS MS-PS3-1

Directions: Read each question carefully. Circle the correct choice or write your answer on the line. Use the diagram to help you.

Example

A 14 kg object moves at 2 m/s. What is its kinetic energy? (KE = ½mv²)

Answer: 28 J

RememberPotential and kinetic energy

top: most potentialbottom: most kineticPE = m × g × h (height)KE = ½ × m × v² (speed)Energy changes form butthe total stays the same.
  1. 1

    A 10 kg object moves at 7 m/s. What is its kinetic energy? (KE = ½mv²)

    10 kgv = 7 m/sKE = ½ m v² = ?
  2. 2

    If an object's mass doubles at the same speed, what happens to its kinetic energy?

  3. 3

    A 16 kg object moves at 9 m/s. What is its kinetic energy? (KE = ½mv²)

    16 kgv = 9 m/sKE = ½ m v² = ?
  4. 4

    A 1 kg object moves at 4 m/s. What is its kinetic energy? (KE = ½mv²)

    1 kgv = 4 m/sKE = ½ m v² = ?
  5. 5

    A 4 kg object is 7 m above the ground. What is its potential energy? (PE = mgh, g = 10 m/s²)

    4kgh = 7 mPE = m g hg = 10 m/s²
  6. 6

    A 15 kg object moves at 3 m/s. What is its kinetic energy? (KE = ½mv²)

    15 kgv = 3 m/sKE = ½ m v² = ?
  7. 7

    A roller coaster is at the very top of a hill. Is its potential energy at a maximum or minimum?

    MaximumMinimum
  8. 8

    A 5 kg object moves at 2 m/s. What is its kinetic energy? (KE = ½mv²)

    5 kgv = 2 m/sKE = ½ m v² = ?
  9. 9

    A 13 kg object moves at 9 m/s. What is its kinetic energy? (KE = ½mv²)

    13 kgv = 9 m/sKE = ½ m v² = ?
  10. 10

    A 13 kg object is 9 m above the ground. What is its potential energy? (PE = mgh, g = 10 m/s²)

    13kgh = 9 mPE = m g hg = 10 m/s²
  11. 11

    A 2 kg object moves at 11 m/s. What is its kinetic energy? (KE = ½mv²)

    2 kgv = 11 m/sKE = ½ m v² = ?
  12. 12

    If an object's speed doubles, what happens to its kinetic energy?

★ Challenge corner for fast finishers

Why does your breath make fog on a cold window?

How did I do?

Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/science/8/kinetic_potential

Answer key (click to show)
  1. 1.245 J
  2. 2.it doubles
  3. 3.648 J
  4. 4.8 J
  5. 5.280 J
  6. 6.67.5 J
  7. 7.maximum
  8. 8.10 J
  9. 9.526.5 J
  10. 10.1170 J
  11. 11.121 J
  12. 12.it becomes 4 times as large
  13. ★water vapor in your breath condenses on the cold glass (challenge corner)

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