contact and non-contact forces

• What is a force?

  A push or pull acting on an object
• What are the two components of a force?

  Magnitude and direction
• What is the unit of force?

  Newton
• How can forces be categorized?

  Into contact forces and non-contact forces
• What is a contact force?

  Force when two objects are physically touching
• In a tug of war, what type of force is acting on the soldier?

  Tension force
• How does friction act on an airplane landing on water?

  It slows down the airplane
• What is air resistance?

  A contact force acting upwards on a sky diver
• What is the normal contact force?

  Upward force exerted by a surface
• What happens to the normal contact force when a lamp is on a table?

  It balances the weight of the lamp
• What is a non-contact force?

  Force when objects are physically separated
• How does gravitational force act between the Earth and the International Space Station?

  It attracts both objects towards each other
• What is electrostatic force?

  Force between two charged objects
• How do opposite charges interact in electrostatic force?

  They experience an attraction
• How do like charges interact in electrostatic force?

  They experience a repulsion
• What is magnetic force?

  Force experienced by objects in a magnetic field
• What will be covered in later videos regarding magnetic force?

  More details about magnetic force
• What are the main types of forces discussed?

  • Contact forces
  • Tension
  • Friction
  • Air resistance
  • Normal contact force
  • Non-contact forces
  • Gravitational force
  • Electrostatic force
  • Magnetic force
• What are the characteristics of contact forces?

  • Occur when two objects are touching
  • Examples include tension, friction, and air resistance
  • Normal contact force acts perpendicular to the surface
• What are the characteristics of non-contact forces?

  • Occur when objects are separated
  • Examples include gravitational, electrostatic, and magnetic forces
  • Can act over a distance without physical contact