forces

Cards (105)

  • What does a vector have that a scalar does not?
    Direction
  • Why can scalars generally not be negative?
    They only have magnitude, no direction
  • What is an example of a scalar?
    Speed
  • What is an example of a vector?
    Velocity
  • What is the scalar quantity for distance?
    Distance
  • What is the vector quantity for distance?
    Displacement
  • What is the scalar quantity for time?
    Time
  • What is the vector quantity for acceleration?
    Acceleration
  • What is the vector quantity for force?
    Force
  • What is the scalar quantity for mass?
    Mass
  • What is the vector quantity for momentum?
    Momentum
  • What is the scalar quantity for energy?
    Energy
  • What is the displacement of a ball at the height of a cliff?
    0
  • How is positive displacement defined for a ball thrown off a cliff?
    Above the cliff height
  • How is negative displacement defined for a ball thrown off a cliff?
    Below the clifftop
  • What can you decide in long answer questions about vectors?
    Where the "0" point may lie
  • When is speed considered velocity?
    When given a direction
  • What happens to a car's velocity while traveling around a roundabout at constant speed?
    Its direction is constantly changing
  • How can vectors be represented visually?
    By arrows indicating magnitude and direction
  • What are the two types of forces based on interaction?
    Contact and Non-Contact
  • What is an example of a non-contact force?
    Gravitational attraction
  • What is an example of a contact force?
    Friction
  • What does the gravitational field strength depend on?
    The mass of the object
  • What is weight?
    Force exerted on mass by gravity
  • How is weight calculated?
    Weight = mass × gravitational field strength
  • What is the formula for weight?
    W = mg
  • What is the gravitational field strength on Earth?
    9.8 N/kg
  • How does weight change on different planets?
    Weight varies due to different gravitational strengths
  • Where does the weight of an object act?
    At the object's center of mass
  • What is a resultant force?
    Sum of all forces acting on an object
  • How do you find the resultant force when forces act in the same direction?
    Add the forces together
  • How do you find the resultant force when forces act in opposite directions?
    Subtract the forces
  • What forces act on a skydiver?
    Air resistance and weight
  • What is the resultant force when a skydiver first jumps?
    833 N down
  • What happens to the resultant force as a skydiver falls?
    It decreases as air resistance increases
  • What does a free body diagram show?
    Forces and their directions acting on an object
  • How can a force at angle θ be resolved?
    Into parallel and perpendicular components
  • What is the formula for work done?
    Work Done = Force × Distance
  • What units are used for work done?
    Joules (J)
  • When is work done against gravity?
    When moving vertically against gravitational force