Forces and motion/ movement

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  • Created by: Jasminea
  • Created on: 06-02-14 16:50
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  • Forces and motion/ movement
    • Mass and weight
      • MASS NEVER CHANGES
    • Newton's laws of motion
      • 1st law
        • If the total force on an object is 0, or all the forces balance out to give zero then the object is still or moving at constant velocity
          • Example: Spacecraft only needs fuel to escape the atmosphere... zero force 4 day trip to the moon at constant velocity
            • Hockey, curling, parachitist
      • 2nd law
        • The total force acting on an object is directly proportional to it's acceleration in m/s/s. This is shown by the straight line graph on the air track experiment. The constant of proportion is the mass of the car.
          • F = M x A This is for sideways motion
            • F is the total force, you must find this by adding or subtracting forces before using the equation
            • W = M x G. this is for falling objects (G is acceleration)
    • Moon
      • On the moon a hammer and feather will hit the ground at the same time because there's no air, air resistance
      • Velocity is always changing (direction)
    • Car
      • thinking distance
        • affected by
          • speed
          • tiredness
          • poor night vision
          • Phones/eating
          • drugs/alcohol
      • Braking distance
        • affected by
          • mass of vehicle
          • Weather conditions
          • Conditions of brakes
          • Speed
      • Total stopping distance = Thinking distance + breaking distance
    • Parachutist
      • As the skydiver first jumps out there's only weight on her and it's her strongest acceleration
        • After a while she speeds up, this causes air resistance
          • When air resistance = the weight force = 0 so acceleration = 0. velocity is constant, terminal velocity
            • The parachute opens and this causes large area and large air resistance. This causes decelleration
              • Her speed drops to a new slower terminal velocity
                • She slowly drops to the ground
          • Total force = W-A
            • If the total force on an object is 0, or all the forces balance out to give zero then the object is still or moving at constant velocity
              • Example: Spacecraft only needs fuel to escape the atmosphere... zero force 4 day trip to the moon at constant velocity
                • Hockey, curling, parachitist
        • A = W/M
    • Speed
      • Object moving at a constant speed you can use Distance = speed x time
    • Velocity
      • speed in a particular direction
        • movement of a straight line
          • Object moving at a constant speed you can use Distance = speed x time
    • Graphs
      • reversing, slowing, going back
      • Slowing down
      • Still/ stationary
      • Speeding up or accelerating
      • velocity time
        • gradient of the graph = acceleration
        • D = V x T
        • D = area under the v-t graph
    • Acceleration due to gravity
      • If there's no air resistance. all objects fall at the same rate of acceleration,g.   G = 10m/s/s
        • To convert mass and weight. M x 10 = W

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