P5

• Vector quantity: A quantity that has both magnitude and direction.

  Examples: force, velocity, displacement, acceleration, momentum

  Scalar Quantity: A quantity that has just magnitude

  Examples: speed, distance, mass, temperature
• A force is a push or pull that acts on an object due to interaction with another object.

  A force is either or a contact or a non-contact force

  A non-contact force is when the objects don't need to be touching for the force to act

  example: magnetic force, electrostatic force

  A contact force when 2 objects have to be touching for a force to act

  example: friction
• • Gravitational force: The force of Attraction between masses
  • the larger the mass, the stronger the field, the greater the attraction
  • Gravity allows objects to fall towards the ground and gives everything a weight
• Weight is measured in Newtons, weight is the force acting on abject due to gravity, the force is caused by the gravitational field around the earth

  Mass is the quantity of matter that makes up a given up object

  $weight\ =$$\ mass\ \cdot\ GFS\$
• What is a vector?

  A vector has magnitude and direction
• What is a scalar?

  A scalar has just magnitude
• Why can vectors be negative?

  Vectors can be negative due to direction
• Is speed a scalar or a vector?

  Speed is a scalar
• Is velocity a scalar or a vector?

  Velocity is a vector
• Is distance a scalar or a vector?

  Distance is a scalar
• Is displacement a scalar or a vector?

  Displacement is a vector
• Is time a scalar or a vector?

  Time is a scalar
• Is acceleration a scalar or a vector?

  Acceleration is a vector
• Is force a scalar or a vector?

  Force is a vector
• Is mass a scalar or a vector?

  Mass is a scalar
• Is momentum a scalar or a vector?

  Momentum is a vector
• Is energy a scalar or a vector?

  Energy is a scalar
• What is the displacement of a ball at the height of a cliff?

  The displacement is 0 at the cliff height
• How can you set the "0" point of a vector?

  You can set zero to be any reference point
• When is speed considered velocity?

  When speed is given with a direction
• What happens to a car's velocity when it travels around a roundabout at constant speed?

  The car's velocity is constantly changing
• How are vectors represented visually?

  Vectors are represented by arrows
• What is a force?

  A force is a push or pull on an object
• What are the two types of forces?

  Contact and non-contact forces
• What is an example of a non-contact force?

  Gravitational attraction
• What is an example of a contact force?

  Friction
• How does gravitational attraction work?

  Mass creates a force of attraction
• What is the formula for weight?

  Weight = mass × gravitational field strength
• What is weight?

  Weight is the force exerted by gravity
• What units are used for weight and mass?

  Weight in newtons, mass in kilograms
• How is weight measured?

  By a force meter or calibrated spring-balance
• What is the value of g on Earth?

  g = 9.8
• How does weight differ on different planets?

  Weight varies due to different gravitational strengths
• What causes acceleration in free fall?

  Acceleration is due to gravity
• Where does the weight of an object act?

  At the object's centre of mass
• What is a resultant force?

  A single force representing all acting forces
• How do you find the resultant force when multiple forces act along a straight line?

  Add or subtract the forces accordingly
• What forces act on a skydiver?

  Air resistance and weight
• What happens to a skydiver's resultant force as they fall?

  The resultant force decreases as air resistance increases
• What is terminal velocity?

  When resultant force is zero, no acceleration