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Grade 9 Forces & Newton's Laws Worksheet with Answers

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

Unit 2: Forces & Newton's LawsBalanced & Unbalanced ForcesNGSS HS-PS2-1

Forces such as gravity and friction, and Newton's three laws of motion. 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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Forces & Newton's Laws

Grade 9 · Physics

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Name

Class

Date

Learning goal: Balanced & Unbalanced Forces · NGSS HS-PS2-1

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

Example

What force acts against motion between two surfaces touching each other?

Answer: friction

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

    What is Newton's First Law about?

  2. 6

    Why does a heavier truck need a bigger force than a car to speed up at the same rate?

  3. 7

    What is Newton's Third Law about?

  4. 8

    Using F = ma, find the force on a 4 kg object accelerating at 2 m/s².

  5. 9

    What do we call the force of air pushing against a moving object?

  6. 10

    Taking g = 10 N/kg, what is the weight of a 16 kg object on Earth?

  7. 11

    Why do passengers lurch forward when a bus brakes suddenly?

  8. 12

    What do we call a push or a pull?

  9. 13

    What is the difference between mass and weight?

  10. 14

    Using F = ma, find the force on a 15 kg object accelerating at 2 m/s².

  11. 15

    Why do tires have treads?

  12. 16

    What force pushes up on a boat in water?

★ 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/physics/9/forces_laws

Answer key (click to show)
  1. 1.applied force
  2. 2.friction
  3. 3.gravity
  4. 4.normal force
  5. 5.an object stays at rest or keeps moving at the same velocity unless a force acts on it (inertia)
  6. 6.it has more mass, and F = ma
  7. 7.for every action, there is an equal and opposite reaction
  8. 8.8 N
  9. 9.air resistance (drag)
  10. 10.160 N
  11. 11.inertia: their bodies keep moving forward
  12. 12.a force
  13. 13.mass is the amount of matter (kg); weight is the force of gravity on it (N)
  14. 14.30 N
  15. 15.to increase friction and grip on the road
  16. 16.buoyancy (upthrust)
  17. ★water vapor in your breath condenses on the cold glass (challenge corner)

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