forces and their interactions

• What kind of quantities are mass, temperature, speed, energy, distance, and time?

  Scalar quantities
• What single property do scalar quantities have?

  Magnitude only
• What does the word "magnitude" mean?

  Size
• What key property do scalar quantities lack?

  Direction
• Why is distance considered a scalar quantity?

  It gives no idea of direction
• Why does stating a distance not tell us where we're going?

  Scalar quantities have magnitude only
• What single property do scalar quantities have?

  Magnitude
• What properties do scalar quantities lack?

  Direction
• Which of the following quantities are vector quantities?

  Weight
• Which of the following quantities are vector quantities?

  Force
• Which of the following quantities are vector quantities?

  Velocity
• What two properties do vector quantities have?

  Magnitude and direction
• How does displacement differ from distance?

  Displacement is distance in a direction
• If a journey involves traveling 800 meters, what additional information is needed to define displacement?

  A specific direction
• What two pieces of information must be stated to describe displacement?

  Magnitude and direction
• How can vectors be represented visually?

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

  The magnitude
• What property of the vector does the direction of the arrow represent?

  The direction
• What is a force?

  A push or a pull on an object
• Why does a force act on an object?

  Due to interaction with another object
• What two properties do all forces have?

  Magnitude and direction
• What type of quantity is force?

  Vector quantity
• What is the unit of force?

  Newton
• Into what two categories can all forces be divided?

  Contact forces and non-contact forces
• When do contact forces take place?

  When two objects are physically touching
• What does friction cause the airplane to do when landing on the sea?

  Slow down and come to a stop
• As a skydiver falls through the air, what does air resistance cause?

  A force to act upwards
• What is the final contact force mentioned?

  Normal contact force
• What is the downward force exerted by the lamp on the table called?

  The weight of the lamp
• What is the upward force exerted by the table on the lamp called?

  Normal contact force
• When can normal contact force happen?

  If two objects are in direct contact
• In the case of non-contact forces, how are the two objects?

  Physically separated
• What does gravitational force do?

  Attracts all objects to other objects
• What does gravitational force attract the International Space Station to?

  The Earth
• What is electrostatic force?

  Force between two charged objects
• What force do objects with opposite charges experience?

  Electrostatic force of attraction
• What force do objects with the same type of charge experience?

  Electrostatic force of repulsion
• What is magnetic force?

  Force experienced in a magnetic field
• What kind of objects experience magnetic force?

  Certain objects
• What is gravity defined as?

  A force of attraction between objects