Contact and non-contact forces

• What is a force?

  A force is a push or a pull that acts on an object due to the interaction with another object.
• What do all forces have?

  Have a magnitude and direction.
• Is force a vector or scalar quantity?

  Vector
• What is the unit for force?

  Newton (N)
• What is a contact force?

  where the two objects are physically touching. For example Tension in a rope.
• What are the examples of contact forces?

  Tension, Air resistance, Friction, Normal contact force (reaction force).
• What is a non-contact force?

  Where the two objects are physically separated.
• What are the examples of non- contact forces?

  Gravitational force, Electrostatic force and magnetic force (both can be attractive or repulsive).