Physics Forces

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  • Force Basics
    • Weight mass and gravity
      • Gravitational Forces
        • Gravity attracts all masses, you only notice it when one or more of the masses are huge aka a planet. Anything near a planet or star is attracted to it very strongly
        • Two important effects:
          • on the surface of a planet, it makes all things accelerate towards the ground
          • Gives everything a weight
      • Weight and mass= not the same
        • mass is amount of stuff in object. Same value anywhere in universe
        • Weight= force acting on object due to gravity (gravitational pull force on the object).
          • Force is caused by gravitation fields + the size of force depends on gravitational field strength.
            • Gravitational field strengths
              • Varies with location, the closer you are to the mass causing the field, the stronger it is +stronger for larger masses/
                • Weight of an object changes with location
          • Can change depending where is  1kg on earth =9.8N, on moon =1.6N.
      • Measuring Weight
        • Weight is measured in newtons
          • Aciting from a single point of object + centre of mass
            • Centre of mass = a point at which you assume the whole mass is concentrated. For uniform object, sanme density throughout and regular shape= centre of object
        • Measured using a newton meter
        • Mass measure in kilograms on mass balance
        • Calculatinweight
          • W=mg
    • Physics Forces
      • Forces and their effects
        • Forces and elasticity
        • Investigating springs
      • Past Papers
    • Contact and Non-contact forces
      • Vectors
        • have size and direction
          • e.g force, velocity, displacement,acceleration, momentum
        • represented by an arrow, length shows magnitude, directions shows direction of quantity
      • Scalars
        • Have size
          • e.g speed, distance, mass , temp. ,time
      • A force is a push or pull on an object that is caused by interacting with something. All forces either contact or non contacts
        • When 2 objects touch for a force to act = contact. e.g friction, air resistance, tension in rope, normal contact force
        • when 2 object don't need to touch for the force to act= non-constant. e.g magnetic forces, gravitational forces, and electrostatics.
      • When 2 forces interact, there is a force produced on both sides. equal and opposite (newton 3rd law)
    • Resultant Forces
      • if you have a number of forces acting at the same point you can replace them with a single force that has the same effect. The single force is the resultant force
      • Determinin the resultant force.
        • If the forces on an object, act along the same line , the resultant force is found by finding sum of all forces.
      • Free body diagrams
    • Work Done

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