forces

• Vector


  A quantity that has magnitude and direction
• Newton's First Law of Motion


  An object in motion will remain in motion unless acted upon by another force
• Newton's Second Law of Motion

  The acceleration of an object depends on the mass of the object and the amount of force applied.
• Newton's Third Law of Motion

  For every action there is an equal and opposite reaction
• Speed


  The distance an object travels per unit of time
• Velocity


  The distance an object travels per unit of time in a given direction
• Equilibrium


  A state where all the forces acting on an object are in balance
• Friction


  A force that opposes motion between two surfaces that are in contact
• Terminal Velocity


  The velocity at which the forces of friction and weight are equal
• Tension


  The force in a stretched object
• Weight


  The force of gravity on an object
• Displacement


  The distance traveled in a given direction
• Distance


  The length of a path between two points
• Scalar


  A physical quantity that has magnitude only.
• Magnitude


  The size of a quantity
• Driving Force


  The force that makes an object move
• Resultant Force


  The overall effect of all the forces on an object.
• Free-Body Force Diagram


  A diagram showing all the forces acting on an object

  
• Moment


  The turning effect of a force
• Load


  The weight of an object
• Effort


  The force applied to the load
• Force Multiplier


  A lever where the load is bigger than the effort.
• Pivot


  The point of rotation
• Moment Equation


  = Force × Perpendicular Distance

  
  

  =Fd
• Gear


  A rotating wheel with teeth that transfers motion and forces
• Centre Of Mass


  a point representing the mean position of the matter in a body or system.
• Principle Of Moments


  For an object that is not turning:

  The sum of all clockwise moments = The sum of all anti-clockwise moments
• Parallelogram of Forces (Triple Topic)

  A geometrical method of finding the resultant force of two forces that are not parallel
• Resolution of Forces (Triple Topic)

  Splitting a resultant force into two forces that act perpendicular to each other
• Gradient


  The rate of inclination
• Acceleration


  The rate at which velocity changes
• Distance-Time Graph

  
• Deceleration


  The rate at which an object slows down
• Velocity-Time Graph

  
• Distance Traveled (Triple Topic)

  The area beneath the line on a Velocity-Time graph
• Tangent (Triple Topic)


  A straight line that touches a curve at one point.
• Inertia (Triple Topic)


  The tendency of an object to resist a change in motion
• Gravitational Field Strength


  The force on a 1 kg object due to gravity
• Stopping Distance


  The shortest distance a car can safely stop in

  
  

  = Thinking Distance + Braking Distance
• Thinking Distance


  The distance travelled by the vehicle in the time it takes the driver to react