Force and Quantity

• What is a scalar quantity described by?

  Magnitude only
• What is a vector quantity characterized by?

  Magnitude and direction
• What does force represent in physics?

  A push and pull upon an object
• Does the presence of forces acting on an object guarantee its motion?

  No, it does not guarantee motion
• What happens if the net force is not equal to zero?

  The object will move
• What occurs if an object is stationary and the net force is zero?

  It will remain at rest
• What happens if an object is moving at uniform velocity and the net force is zero?

  It will continue to move at uniform velocity
• How can the concepts of net force be applied in real life?

  Example: kicking a ball
• What is net force?

  The sum of all forces
• What is the unit of force in the SI system?

  1 N = 1 kg⋅m⋅s
• What are the two main types of forces?

  1. Contact Forces

  • Result from interaction of objects in contact
  • Examples: applied force, frictional force, air resistance, normal force

  1. Non-Contact Forces

  • Result from interaction without contact
  • Examples: gravitational force, tension force, electrical and magnetic forces
• What are contact forces?

  Forces from interaction of objects in contact
• What is frictional force?

  Force opposing motion between surfaces
• What is air resistance?

  Force opposing motion through air
• What is normal force?

  Applied force in the upward direction
• What are non-contact forces?

  Forces acting without physical contact
• What is gravitational force?

  Force attracting objects towards each other
• What is tension force?

  Force transmitted through a rope or wire
• What are the effects of forces on objects?

  • Set objects in motion
  • Change velocity
  • Stop motion
  • Change direction
  • Change shape