Forces and Fibers

Contact and Non-Contact Forces

• Forces can be classified into two categories: contact forces and non-contact forces
• Contact Forces:
  • Forces that act through direct physical contact between two objects
  • Examples:
    • Frictional force
    • Muscular force
    • Normal force
• Non-Contact Forces:
  • Forces that act without physical contact between two objects
  • Examples:
    • Gravitational force
    • Magnetic force
    • Electrostatic force

Synthetic Fibers

• Rayon:
  • A semi-synthetic fiber made from wood pulp
  • Properties:
    • Soft and smooth
    • Breathable
    • Can be dyed easily
  • Uses:
    • Clothing
    • Upholstery
    • Bedding
• Nylon:
  • A synthetic fiber made from polyamide
  • Properties:
    • Strong and resistant to wear
    • Water-resistant
    • Easy to clean
  • Uses:
    • Outdoor gear
    • Sportswear
    • Fishing nets
• Polyester:
  • A synthetic fiber made from polyethylene terephthalate (PET)
  • Properties:
    • Strong and resistant to wrinkles
    • Easy to care for
    • Can be blended with other fibers
  • Uses:
    • Clothing
    • Upholstery
    • Bottles
• Acrylics:
  • A synthetic fiber made from polyacrylonitrile (PAN)
  • Properties:
    • Soft and warm
    • Lightweight
    • Resistant to wrinkles
  • Uses:
    • Clothing
    • Blankets
    • Hats and scarves

Forces

• Contact forces act through direct physical contact between two objects
• Examples of contact forces include frictional force, muscular force, and normal force
• Non-contact forces act without physical contact between two objects
• Examples of non-contact forces include gravitational force, magnetic force, and electrostatic force

Synthetic Fibers

Rayon

• Semi-synthetic fiber made from wood pulp
• Properties: soft and smooth, breathable, can be dyed easily
• Uses: clothing, upholstery, bedding

Nylon

• Synthetic fiber made from polyamide
• Properties: strong and resistant to wear, water-resistant, easy to clean
• Uses: outdoor gear, sportswear, fishing nets

Polyester

• Synthetic fiber made from polyethylene terephthalate (PET)
• Properties: strong and resistant to wrinkles, easy to care for, can be blended with other fibers
• Uses: clothing, upholstery, bottles

Acrylics

• Synthetic fiber made from polyacrylonitrile (PAN)
• Properties: soft and warm, lightweight, resistant to wrinkles
• Uses: clothing, blankets, hats and scarves

Classify forces into contact and non-contact forces and learn about synthetic fibers like Rayon. Understand the differences and examples of each type of force and fiber.