Notes on Force

Definition of Force

• Force: A push or pull that can affect an object's motion and shape.
• Unit of Force: Newton (N)
  • Named after Sir Isaac Newton, an English scientist.

Effects of Force

• Can make an object move.
• Can change the direction of a moving object.
• Can make a moving object speed up.
• Can stop a moving object.
• Can change the shape of an object.

Types of Force

1. Contact Force

• Requires objects to touch for the force to act.
• Examples:
  • Opening a door
  • Kicking a ball
  • Dribbling a tennis ball
  • Pressing a button

2. Non-Contact Force

• Can act without objects touching each other.
• Types include:
  • Magnetic Force:
    • Push or pull exerted by a magnet.
    • Magnets can attract magnetic objects.
    • Example: Compass for finding directions.
  • Electrostatic Force:
    • Exists between all charged particles.
    • Examples:
      • Lightning
      • Hair standing up due to static electricity
  • Gravitational Force:
    • Attracts objects towards Earth's center.
    • Examples:
      • Moon's orbit around Earth
      • Planets' orbit around the Sun
      • Water falling from mountains
      • Snow falling in winter
      • Leaves falling from trees

Summary

• Force is essential in understanding motion and interactions between objects.
• It can be classified into contact and non-contact forces, each with specific examples and effects.