5. Exploring Forces – Textbook Worksheet

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Force

Q1. Multiple Choice Questions (MCQs)

Instruction: Select the correct option for each question.

  1. In science, a force is defined as:
    a) Only a push
    b) Only a pull
    c) A push or a pull
    d) Energy of motion
  2. Which of these is NOT an effect of force?
    a) Change of shape
    b) Change of direction
    c) Production of light
    d) Start/stop motion
  3. Forces always involve:
    a) Only one object
    b) Interaction between two objects
    c) Only moving objects
    d) Only heavy objects
  4. The SI unit of force is:
    a) Joule (J)
    b) Watt (W)
    c) Newton (N)
    d) Pascal (Pa)
  5. Friction is a force that:
    a) Aids motion
    b) Always increases speed
    c) Opposes motion between surfaces in contact
    d) Acts only in liquids
  6. Which is a non-contact force?
    a) Muscular force
    b) Friction
    c) Magnetic force
    d) Push with a stick
  7. Gravity is:
    a) Sometimes attractive, sometimes repulsive
    b) Always repulsive
    c) Always attractive
    d) Only acts on Earth
  8. Weight is measured in:
    a) Kilogram (kg)
    b) Newton (N)
    c) Meter (m)
    d) Joule (J)
  9. An object floats in a liquid when:
    a) Weight > buoyant force
    b) Weight = buoyant force
    c) Weight < buoyant force
    d) There is no gravity

Q2. Fill in the Blanks

Instruction: Fill in the blanks with the correct word based on the chapter.

  1. A force is a __________ or a __________.
  2. If an object’s speed or direction changes, a __________ has acted.
  3. The SI unit of force is the __________ (symbol: N).
  4. Friction always acts in a direction __________ to motion.
  5. Forces that act without contact are called __________ forces.
  6. The force with which Earth pulls objects is called __________.
  7. Weight is a __________ and is measured in newtons.
  8. The device used to measure weight (force) in newtons is a __________ balance.
  9. The upward force exerted by a liquid on an immersed object is called __________ force.
  10. An object sinks when its __________ is greater than the buoyant force.

Q3. Short Answer QuestionsInstruction: Answer the following questions in 2–3 lines.

  1. How does friction depend on the nature of surfaces?
  2. Explain why cycling uphill feels harder than cycling downhill.
  3. What does “forces work in pairs” mean?
  4. How do we find the least count of a spring balance?
  5. Why do streamlined shapes help in air or water?

Q4. Match the Following

Instruction: Match Column A with the correct option in Column B.

Q5. Application/Reasoning (Short Problems)

Instruction: Answer the following briefly in 2–3 lines.

  1. A wooden block is pushed on a rough table and stops after some distance. Why?
  2. A 1 kg object has a weight of about 10 N on Earth. What will be its weight on the Moon (g ≈ 1.6 m/s²)?
  3. A spring balance has marks 0 to 5 N with 10 equal divisions between each newton. What is its least count?
  4. Two balloons rubbed with wool repel each other. Which force is acting and why?
  5. A stone sinks in water but a sealed empty plastic bottle floats. Why?

Check the solutions of worksheet here.