Force of Friction

  1. Q1: What force opposes the motion of one object over another?
    Answer: Friction
    Explanation: Friction is the opposing force that acts when two surfaces move or try to move over each other.
  2. Q2: What kind of force is friction—contact or non-contact?
    Answer: Contact
    Explanation: Friction only acts when two surfaces are in contact with each other.
  3. Q3: Which type of surface produces more friction—smooth or rough?
    Answer: Rough
    Explanation: Rough surfaces have more irregularities, increasing the friction between them.
  4. Q4: What kind of friction acts on an object at rest?
    Answer: Static
    Explanation: Static friction prevents an object from starting to move when a force is applied.
  5. Q5: What friction occurs when an object slides over a surface?
    Answer: Sliding
    Explanation: Sliding friction acts when one surface moves over another.
  6. Q6: What friction is involved when wheels move over a surface?
    Answer: Rolling
    Explanation: Rolling friction occurs when an object rolls over a surface and is usually less than sliding friction.
  7. Q7: What do we apply between machine parts to reduce friction?
    Answer: Lubricant
    Explanation: Lubricants like oil or grease reduce friction between moving parts.
  8. Q8: What is produced when you rub your hands together due to friction?
    Answer: Heat
    Explanation: Friction converts kinetic energy into heat when two surfaces rub against each other.
  9. Q9: What force helps us to walk without slipping?
    Answer: Friction
    Explanation: Friction between our feet and the ground provides grip and prevents slipping.
  10. Q10: What method is used on the soles of shoes to increase friction?
    Answer: Grooves
    Explanation: Grooves on soles increase surface irregularities, improving grip by increasing friction.

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