5.1 Forces & Interactions

• What are the two types of quantities?

  Scalar and vector

  
• What defines a scalar quantity?

  It has only a magnitude

  
• What defines a vector quantity?

  It has both magnitude and direction

  
• Why is it necessary to mention direction when describing velocity?

  Because velocity includes both speed and direction
• What is distance in terms of scalar quantities?

  It describes how long an object is or how far it is
• How does displacement differ from distance?

  Displacement includes direction
• What are some commonly confused pairs of scalars and vectors?

  • Distance and displacement
  • Speed and velocity
  • Weight and mass
• What does distance measure?

  Length of the path taken between two points
• What does displacement measure?

  Length of a line between two points with direction
• How can a vector be represented visually?

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

  The magnitude of the vector
• What does the direction of an arrow in a vector indicate?

  The direction of the vector
• Why is it important to represent displacement accurately?

  Because it can be less than the distance travelled
• If a tennis ball is thrown at an angle of 45° at 5 m/s, how would you represent its velocity vector?

  Draw an arrow at 45° with appropriate length

  
• How would you represent a second tennis ball thrown at 10 m/s in the same direction?

  Draw an arrow twice as long as the first

  
• What is a force defined as?

  A push or pull acting on an object
• How can forces affect objects?

  They can change speed, direction, or shape
• What is thrust?

  The force causing an object to move
• What is weight?

  The force of gravity on a mass
• What is air resistance also known as?

  Drag
• What is a contact force?

  A force acting between touching objects
• What is a non-contact force?

  A force acting at a distance without contact
• What is gravitational attraction?

  The force between two objects with mass
• What is electrostatic force?

  A force between charged objects

  
• What is magnetic force?

  A force between magnetic poles

  
• In the scenario where Ben drags a sledge, what contact forces are involved?

  Tension, friction, and reaction force
• In the same scenario, what non-contact force is involved?

  Gravitational attraction
• What is the significance of identifying forces accurately?

  It is crucial for understanding physics concepts
• How is force measured?

  In Newtons
• How can the direction of a force be described?

  As left, right, up, down, or angles
• What is a force pair?

  Forces exerted on each object in interaction
• What is the weight of an object?

  The force due to gravitational attraction

  
• Why is it important to use correct terminology when discussing forces?

  To avoid confusion and ensure clarity
• What is the common mistake when referring to the force of gravity?

  Calling it simply "gravity"
• What is the correct term for air resistance?

  Drag
• How are forces classified?

  Into contact and non-contact forces
• What is the unit of force?

  Newton
• What does the magnitude of a force indicate?

  The strength of the force
• How can angles be used in force descriptions?

  To describe non-horizontal or vertical forces
• What is the magnitude of a force measured in?

  Newtons