Physics Hinesh

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  • Motion.
  • The distance-time graph for any object that is - stationary is a horizontal line - moving at constant speed is a straight line that slopes upwards.
  • The gradient of a distance-time graph for an object represents the object's speed. 
  • Speed in metres per second, m/s = distance travelled in metres, m / time taken in seconds, s.
  • Velocity is speed in a given direction.
  • Acceleration is change of velocity per second. The unit of acceleration is the metre per second squared (m/s2).
  • Acceleration = change of velocity / time taken. 
  • Deceleration is the change of velocity per second when an object slows down.
  • If a velocity-time graph is a horizontal line, the acceleration is zero. 
  • The gradient of the line on a velocity-time graph represents acceleration.
  • The area under the line on a velocity-time graph represents distance travelled. 
  • The speed of an object is given by the gradient of the line on its distance-time graph. 
  • The acceleration of an object is given by the gradient of the line on its velocity-time graph.
  • The distance travelled by an object is given by the area under the line of its velocity-time graph.
  • Forces.
  • A force can change the shape of an object or change its motion or its state of rest. 
  • The unit of force is the newton (N). 
  • When two objects interact, they always exert equal and opposite forces on each other.
  • The resultant force is a single force that has the same effect as all the forces acting on an object. 
  • If the resultant force on an object is zero, the object stays at rest or at constant velocity. If the resultant force on an…

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