Physics 2

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  • Motion,Energy,Electricty
    • Velocity and Distance-Time Gaphs
      • Speed and velocity are both measured in m/s
        • speed is just how fast you are going with no direction.         But velocity must have direction specified (30mph north)
        • Its how fast you are going
        • speed= distance/tim-e
        • Acceleration
          • is how quickly the velocity is chaning
          • something speeds up
          • this change in velocity can be changed in speed or a change in direction or both
          • formula= change in velocity/time taken
          • Example: A cat accelerates from 2 m/s to 6m/s in 5.6 seconds. Find its acceleration? A=  6-2=4/5.6=0.71M/S2
          • units of acceleration is m/s2 (little two)
      • Distance-time graphs
        • Important Notes
          • Gradient=speed
            • flat sections are where its stationary (stopped)
          • straight uphill or downhill section means steady speed
          • the steeper the graph the faster its going
          • downhill section means its going back towards the starting point
          • curves represent acceleration or deceleration
          • a steepening curve means its speeding up
          • A levelling off curve means its slowing down
    • Physics 2
    • Acceleration and velocity-time graphs
      • Velocity-time graphs
        • Important notes
          • Gradient=acceleration
          • flat sections represent steady speed
          • steeper the graph the greater the acceleration or deceleration
          • uphill section are acceleration
          • downhill sections are decelerations
          • the area under any section of the graph is equal to the distance travelled in the time interval
          • a curve means changing acceleration
    • Weight,Mass and Gravity
      • Gravational force is the force of attraction between all masses
        • on the surface of a plant it makes all things accelerate towards the ground (10m/s2)
        • it gives everything a weight
      • Weight and mass aren't the same thing
        • Mass is the just the amount of "stuff" in a object
        • weight is caused by gravitational force( pull force)
        • an object has the same mass whether its on earth or the moon, but weight will be different (less gravitational force on moon)
        • Weight is a force measured in newtons. Mass is not a force-its measured in KG.
      • Weight=mass X gravitational field strengh
      • Example: what is the weight in newtons of a 5g mass, both on earth and moon?          A"W=MXG" E=5x10=50N M=5X1.6=8N
      • Gravity on earth=10n/kg Gravity on moon=1.6n/kg


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