Physics Y7 P1

• Force


  A push or a pull
• Force diagrams


  • Arrows indicate the size and direction of each force
• Types of forces


  • Weight
  • Air resistance (drag)
  • Water resistance (drag)
  • Buoyancy (upthrust)
  • Thrust
• Contact force


  A force that acts when objects touch. Air and water are considered objects.
• Contact forces


  • air resistance (drag)
  • applied force
  • buoyant (in water)
  • compression
  • drag
  • driving
  • friction
  • lift (in air)
  • pull
  • push
  • reaction (between solids)
  • resistive
  • spring
  • stretching
  • support (reaction force)
  • tension
  • thrust
  • upthrust
  • water resistance (drag)
• Non-contact force


  A force that acts over a distance. The objects can touch, but don't have to.
• Non-contact forces


  • Electrostatic Force
  • Gravitational Force (Weight)
  • Magnetic Force
• Force field


  A region where an object experiences a force
• As the object moves farther from the center of the field, the force gets weaker
• Mass


  The amount of matter in an object
• Weight


  How much the force of gravity pulls on a mass
• Balanced forces


  Forces acting on an object are the same size but opposite direction
• Stationary


  Not moving
• Stationary objects and objects moving at a steady speed both have balanced forces
• Driving force


  Pushing or pulling an object
• Resistive force


  Slows down a moving object
• If an object is changing speed or direction


  The forces are unbalanced