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

  Newtons
• What does a force of five newtons indicate?

  The magnitude of the force exerted
• 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
• What is air resistance classified as?

  A contact force
• How is tension defined in the context of forces?

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

  The reaction force
• What must the table exert to keep a rock in position?

  An equal and opposite force upwards
• What are the three types of non-contact forces mentioned?

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

  Through empty space without touching
• What is gravitational force?

  A force of attraction between masses
• What happens to the strength of non-contact forces as objects move apart?

  The strength decreases with distance
• How do magnetic forces behave?

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

  Be attractive or repulsive
• What is the main takeaway from the video?

  Understanding contact and non-contact forces