Contact & Non-contact forces

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

  Contact forces and non-contact forces
• How can we describe a force?

  A force is a push or pull that acts on an object due to its interaction with another object
• In what unit do we measure force?

  Newtons
• What does it mean when we say a force has direction?

  It means that the force is acting towards a specific point or in a specific direction
• 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, while non-contact forces do not
• What is an example of a contact force?

  The friction between a board and sand
• How does air resistance function as a contact force?

  It requires the object to come into contact with air particles
• What is tension in the context of contact forces?

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

  It is also known as the reaction force
• How does the normal contact force work with a rock on a table?

  The table exerts an equal and opposite force upwards to support the rock's weight
• What are the three types of non-contact forces mentioned?

  Gravitational force, magnetic force, and electrostatic force
• How do non-contact forces act on objects?

  They can act through empty space without physical contact
• What is gravitational force?

  It is a force of attraction between any two objects that have mass
• What happens to the strength of non-contact forces as objects get further apart?

  The strength of the force decreases as the objects get further apart
• What can be said about magnetic forces?

  They can be attractive or repulsive depending on the poles of the magnets
• What are electrostatic forces?

  They are forces between charged objects that can be attractive or repulsive
• What is a key characteristic of non-contact forces?

  They can act on objects without requiring physical contact