force

• When will an object float?

  If displaced liquid's weight exceeds object's weight
• What is a fluid?

  A liquid or gas
• What defines a force?

  A push or pull from interaction with another object
• What type of quantity is force?

  Vector quantity
• What is inertia?

  The tendency to remain in uniform motion or rest
• How is inertial mass defined?

  Ratio of force over acceleration
• What is the limit of proportionality?

  The point where extension is no longer proportional to force
• What is a moment in physics?

  Turning effect of a force
• How is momentum calculated?

  Product of mass and velocity
• What is a newtonmeter used for?

  Measuring weight
• What does Newton's First Law state?

  Object remains stationary or moves at constant speed if resultant force is zero
• What does Newton's Second Law describe?

  Acceleration is proportional to force and inversely proportional to mass
• What does Newton's Third Law state?

  Forces between two objects are equal and opposite
• What are non-contact forces?

  Forces acting when objects are separated
• What is plastic deformation?

  Permanently changing shape after forces are removed
• How is pressure in a column calculated?

  Density times height times gravitational field strength
• What is the resolution of forces?

  Forces can be resolved into two perpendicular components
• What is a resultant force?

  Single force replacing all individual forces
• What is a resultant moment?

  Single moment equivalent to all other moments
• What are scalar quantities?

  Quantities with magnitude only
• When does an object sink?

  If displaced liquid's weight is less than object's weight
• What is speed in physics?

  Rate of increase of distance
• What is the spring constant?

  Measure of a spring's stiffness
• What is stopping distance?

  Sum of thinking and braking distances
• What is thinking distance?

  Distance traveled during driver's reaction time
• What factors affect thinking distance?

  Tiredness, drugs, or alcohol
• What is upthrust?

  Upward force in a fluid due to pressure difference
• What are vector quantities?

  Quantities with both magnitude and direction
• What is velocity?

  Rate of change of displacement in a direction
• How is weight calculated?

  Mass times gravitational field strength
• What is work done?

  Force causing movement through a distance