Physics P3.2 (Using Physics to make things work)

Mindmap on GCSE Physics Unit P3 sub-unit 2.

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  • Created by: Ethan
  • Created on: 19-03-13 21:01
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  • Physics P3 U2
    • Moments
      • Moment = The turning effect of a force
      • Moment = Force x perpendicular distance from pivot
        • Nm = N x m
    • Centre of Mass
      • All mass is thought to be concN at one point
      • Symmetrical object: COM along axis of symmetry
        • If there are more than 1, COM is where they meet
    • Stability
      • Objects Line of Action of weight passes through its COM straight down towards the ground
      • When LOA of the weight goes outside the base of an object
        • There will be a  resultant moment
          • Object will topple over
      • How to improve stability
        • Make the base of object wider
          • This means it has further to tit before LOA of weight is outside base
            • Lower the COM
        • Lower the COM
    • Hydraulics
      • Pressure = force/area
        • Pressure is given in Pa or N/m^2
        • Hydraulic Pressure Systems
          • Liquids are virtually incompressible
            • Forces exerted at one point in the liquid will be transmitted at other points
            • Pressure acts equally in all directions
              • Forces exerted at one point in the liquid will be transmitted at other points
          • Force Multipliers
      • Hydraulic Pressure Systems
        • Liquids are virtually incompressible
          • Pressure acts equally in all directions
          • Force Multipliers
      • Circular Motion
        • Centripetal Acceleration
          • Object moving in a circle
            • Constantly changing direction
              • Constantly  changing  velocity
                • Therefore it is continually accelerating
        • Centripetal Force
          • Object only accelerates when a resultant force is present
            • Centripetal Acceleration
              • Object moving in a circle
                • Constantly changing direction
                  • Constantly  changing  velocity
                    • Therefore it is continually accelerating
          • If this stops..
            • Object will continue in a straight line at a tangent to the circle
      • Pendulums
        • Equilibrium position is where the pendulum is not moving
        • Simple Pendulum
          • Mass called a blob
          • Mass suspended with a thin string from a fixed point
        • Occilations
          • Amplitude of an occilation is: distance from equilibrium position to highest point
          • Time period is time taken for one full occilation
            • Full oscillation = amplitude to other side and back
            • Depends ONLY upon length of pendulum
              • Longer pendulum = longer time
          • Frequency = no. of occilations per second
    • Moment = Force x perpendicular distance from pivot
      • Nm = N x m

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