Explaining Motion

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Speed  can be worked out if you know:

  • The distance travelled.
  • The time taken to travel that distance.
  • Speed (m/s) = Distance (M)/ Time (S)
  • Their average speed can be calculated from the total distance and total time taken.
  • Their speed at any one time is called the instantaneous speed.
  • If we indicate the direction something is traveling in we can use positive distance and negative distance. 
  • Velocity and speed both tell us how fast something is moving, but velocity also takes account of direction.
  • If we say that an object is moving away from the staring point, we say that it has a positive velocity.
  • Then it has negative velocity when it travels back down. 
  • Forces arise when objects interact with each other.
  • The size of the force is measured in Newtons.
  • If you apply force on an object, the object with apply a force back on you. 
  • This is called the Reaction Force
  • Forces always act in pairs like this.
  • Friction is a force that opposes motion.
  • Lubricants such as oil are often used to reduce friction.
  • Forces can…


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