Physics (P2) Forces

Physics (P2) Forces

1. resultant forces

   • several different forces acting on an object which have different strengths and directions add together to give a resultant force
     • zero resultant force is when all the forces are balanced which means the resultant force is zero
       • when the forces are not balanced, the resultant force is not zero
         • so the object will move in the direction of the resultant force

2. Forces and motion

   • Distance time graphs
     • The gradient on a distance time graph represents the speed of an object
       • the vertical axis is the distance traveled from the start, the horizontal axis is the time from the start
         • when an object is stationary the line remains horizontal
           • when the object is moving at a steady speed the line is straight but sloped
     • speed = distance traveled / time taken
       • speed is measured in meters per second, m/s, Distance is measured in meters, m ,time is measured in seconds, s
   • Velocity time graphs
     • velocity is speed but with a direction
       • the vertical axis is the velocity of an object, the horizontal axis is the time from the start
         • The line is horizontal when there is a constant velocity, the line is straight but sloped when there is a constant acceleration
   • Acceleration
     • a=(v-u)/t

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