P4 - Explaining motion

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  • P4 - Explaining Motion
    • Speed and Velocity
      • Speed tells you how far an object will travel in a certain. It does not tell you the direction of travel
      • Velocity tells you how far an object will travel and also its direction of travel
      • Speed-Time graphs
        • The slope represents the acceleration of the object. The steeper the slope, the greater the acceleration
      • Velocity-Time graphs
        • A velocity-time graph shows how the velocity, at which an object is moving, changes with time
      • Terminal velocity is when one force is equal to another. The resultant force is 0 and the speed becomes constant
        • As a skydiver jumps , he initially accelerates due to gravity, but as the jump goes on, air resistance equals the force of gravity. This means that the resultant force is 0 and he falls at a constant speed.
    • Distance-Time graphs
      • The slope/gradient on the graph shows:
        • The speed of the object. The steeper the slope, the greater the gradien
      • A distance-time graph shows how the distance traveled by an object changes with time
    • Acceleration
      • To calculate acceleration you need to use the formula:
        • Acceleration (m/s^2) = Change in velocity (m/s) / Time taken for change (s)
      • The acceleration of an object is the rate at which its velocity changes
      • Deceleration is simply put, negative accelereation
    • Forces
      • Momentum
        • To calculate momentum you need the formula:
          • Momentum (kg m/s) = Mass (kg) / Velocity (m/s)
        • To calculate change in momentum you need the formula:
          • Change in momentum (kg m/s) = Resultant force (N) / Time the force for (s)
      • A force occurs when two objects interact with each other
        • Whenever one object exerts a force on another, it always experiences an equal yet opposite force in return
          • For example: A rocket's engines push gas backwards and the gas pushes the rocket forwrds
      • Friction
        • When two objects try to slide past each other both objects experience a force that tries to stop them moving. This is friction
        • A moving object experiences friction but so do non moving objects.
          • For example: A car parked on a slope is trying to roll down the hill due to gravity. But there is enough friction from the brakes to stop it
  • Speed-Time graphs
    • The slope represents the acceleration of the object. The steeper the slope, the greater the acceleration
  • A moving object experiences friction but so do non moving objects.
    • For example: A car parked on a slope is trying to roll down the hill due to gravity. But there is enough friction from the brakes to stop it

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