Forces

• What should you be able to describe by the end of the video?

  Scalar and vector quantities with examples
• What is the difference between scalar and vector quantities?

  Scalars have magnitude only; vectors have direction
• What does the term 'magnitude' refer to in physics?

  Magnitude refers to size
• Why does distance not indicate direction?

  Because distance is a scalar quantity
• If you travel 800 meters, what does that tell you?

  It tells you the distance, not the direction
• Why is displacement considered a vector quantity?

  Because it has both magnitude and direction
• If you travel 800 meters due west, what is your displacement?

  500 meters due west
• How can vectors be represented visually?

  Using arrows
• What does the length of an arrow represent in vector representation?

  The magnitude of the vector
• What does the direction of an arrow represent in vector representation?

  The direction of the vector
• How does displacement differ from distance?

  Displacement includes direction; distance does not
• What are the characteristics of scalar quantities?

  • Have magnitude only
  • No direction
  • Examples: mass, temperature, speed, energy, distance, time
• What are the characteristics of vector quantities?

  • Have both magnitude and direction
  • Examples: displacement, weight, force, velocity, acceleration, momentum
• How is displacement calculated?

  • Displacement = distance in a specific direction
  • Example: 500 meters due west
• How are vectors used in physics?

  • Represent forces and motion
  • Visualized with arrows indicating magnitude and direction
• What is a force?

  A push or pull acting on an object
• What are the two characteristics of a force?

  Magnitude and direction
• What is the unit of force?

  Newton
• How can forces be categorized?

  Into contact forces and non-contact forces
• What is a contact force?

  Force when two objects are physically touching
• In a tug of war, what type of force is acting on the soldier?

  Tension force
• How does friction act on an airplane landing on water?

  It slows down the airplane
• What is air resistance?

  A contact force acting upwards on a skydiver
• What is the normal contact force?

  Upward force exerted by a surface
• How does the normal contact force relate to the weight of an object?

  It balances the downward weight force
• What is a non-contact force?

  Force when objects are physically separated
• How does gravitational force act between the Earth and the International Space Station?

  It attracts both objects towards each other
• What is electrostatic force?

  Force between two charged objects
• How do opposite charges interact in electrostatic force?

  They experience an attraction force
• What happens when two objects have the same charge in electrostatic force?

  They experience a repulsion force
• What is magnetic force?

  Force experienced by objects in a magnetic field
• What will be covered in later videos regarding magnetic force?

  More details about magnetic force
• Where can students find questions on contact and non-contact forces?

  In the vision workbook
• What should you be able to describe by the end of the video?

  What's meant by weight
• What is gravity described as in the video?

  A force of attraction between all objects
• Why is gravity considered a non-contact force?

  Because objects do not need to touch
• What type of quantity is gravity?

  Vector quantity
• What does mass tell us about an object?

  How much matter the object has
• What is the unit of mass?

  Kilogram
• Why is mass considered a scalar quantity?

  It has no direction