P2.6 Contact and Non-contact forces

• What are the two types of forces discussed in the video?

  Contact forces and non-contact forces
• How is a force defined in the context of this video?

  A push or pull acting on an object
• In what unit do we measure force?

  Newtons
• What does the term 'magnitude' refer to in the context of force?

  The size or strength of the force
• Why are forces classified as vector quantities?

  Because they have both magnitude and direction
• What is the key difference between contact and non-contact forces?

  Contact forces require physical touching
• Give an example of a contact force.

  Friction between a board and sand
• What is an example of a non-contact force?

  Gravitational force
• What is tension in the context of forces?

  The pulling force exerted through a rope
• What is the normal contact force also known as?

  The reaction force
• How does the normal contact force act on a rock on a table?

  It acts upwards to balance the weight
• What are the three types of non-contact forces mentioned?

  Gravitational, magnetic, and electrostatic forces
• What is gravitational force?

  A force of attraction between masses
• How do magnetic forces behave?

  They can be attractive or repulsive
• What can electrostatic forces do?

  Be attractive or repulsive between charges
• How does the strength of non-contact forces change with distance?

  It decreases as objects get further apart
• What is the example given for air resistance as a contact force?

  The dog's face interacting with air particles
• What is the role of the table in relation to the rock?

  It exerts an upward force to support the rock
• How do non-contact forces differ from contact forces in terms of interaction?

  Non-contact forces act through empty space
• What is a force?


  A force is a push or a pull that acts upon an object as a result of that object's interactions with its surrounding.
• Is force a scalar or vector quantity? Explain why.


  Force has both magnitude and a direction. Therefore, a force is a vector quantity.
• What is a contact force?


  A contact force any force that occurs as a result of two objects making physical contact with each other.
• What is a non-contact force?


  A non-contact force is a force which acts on an object without coming into physical contact with it.
• Is tension a contact or a non-contact force?


  Tension is a contact force.
• Is friction a contact or a non-contact force?


  Friction is a contact force.
• Is weight (the force of gravity acting on an object) a contact or a non-contact force?


  Weight is a non-contact force.
• Is normal contact force contact or non-contact force?


  Normal contact force is a contact force.
• Is electromagnetism a contact or non contact force?


  Electromagnetism is a non-contact force.
• Is magnetic force a contact or a non-contact force?

  Magnetic is a non-contact force.
• Is air resistance a contact or a non-contact force?


  Air resistance is a contact force.
• Name the 3 contact-forces.


  1. Weight (force due to gravity).
  2. Electromagnetism.
  3. Magnetism.