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Grade 9 Newton's Second Law (F = ma) Worksheet with Answers

Grade 9 (US) · Year 10 (UK) · Class 9 (India) · Physics

Unit 2: Forces & Newton's LawsF = maNGSS HS-PS2-1

Using F = ma to find force, mass or acceleration, including net force. This free high school worksheet has 16 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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Newton's Second Law (F = ma)

Grade 9 · Physics

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Learning goal: F = ma · NGSS HS-PS2-1

Directions: This worksheet has 2 parts. Read the instructions at the start of each part.

Example

What force is needed to accelerate a 43 kg object at 10 m/s²?

Answer: 430 N

Part A

Label the diagram. Use the words in the box.

Word bank

applied forcefrictiongravitynormal force
1234
  1. 1
  2. 2
  3. 3
  4. 4
Part B

Answer each question. Use full sentences where you can.

  1. 5

    A net force of 14 N gives an object an acceleration of 2 m/s². What is its mass?

    m = ?F = 14 Na = 2 m/s²
  2. 6

    What force is needed to accelerate a 46 kg object at 2 m/s²?

    46 kgF = ?a = 2 m/s²
  3. 7

    A net force of 276 N gives an object an acceleration of 12 m/s². What is its mass?

    m = ?F = 276 Na = 12 m/s²
  4. 8

    A net force of 16 N gives an object an acceleration of 8 m/s². What is its mass?

    m = ?F = 16 Na = 8 m/s²
  5. 9

    A net force of 231 N acts on a 33 kg object. What is its acceleration?

    33 kgF = 231 Na = ?
  6. 10

    A net force of 396 N acts on a 36 kg object. What is its acceleration?

    36 kgF = 396 Na = ?
  7. 11

    A net force of 117 N gives an object an acceleration of 3 m/s². What is its mass?

    m = ?F = 117 Na = 3 m/s²
  8. 12

    A net force of 77 N gives an object an acceleration of 7 m/s². What is its mass?

    m = ?F = 77 Na = 7 m/s²
  9. 13

    A net force of 147 N gives an object an acceleration of 7 m/s². What is its mass?

    m = ?F = 147 Na = 7 m/s²
  10. 14

    A net force of 108 N gives an object an acceleration of 12 m/s². What is its mass?

    m = ?F = 108 Na = 12 m/s²
  11. 15

    What force is needed to accelerate a 2 kg object at 1 m/s²?

    2 kgF = ?a = 1 m/s²
  12. 16

    What force is needed to accelerate a 33 kg object at 11 m/s²?

    33 kgF = ?a = 11 m/s²

★ Challenge corner for fast finishers

If you could fold a sheet of paper 42 times, roughly how thick would it be?

How did I do?

Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/physics/9/newton_second_law

Answer key (click to show)
  1. 1.applied force
  2. 2.friction
  3. 3.gravity
  4. 4.normal force
  5. 5.7 kg
  6. 6.92 N
  7. 7.23 kg
  8. 8.2 kg
  9. 9.7 m/s²
  10. 10.11 m/s²
  11. 11.39 kg
  12. 12.11 kg
  13. 13.21 kg
  14. 14.9 kg
  15. 15.2 N
  16. 16.363 N
  17. ★far enough to reach the Moon (about 440,000 km) (challenge corner)

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