P10 Forces and Motion

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  • Created by: mbrewer03
  • Created on: 01-02-18 10:12

Forces and Acceleration

  • If the resultant forcce on an object increases, the acceleration will increase, as long as the mass stays the same.
  • If two objects of different masses have the same resulatant fore acting on them, the acceleration of the object with the bigger mass will be smaller
  • You can calculate the resulant force acting on an object using the equation below
  • Resulant force (N) = Mass (kg) x Acceleration (m/s) 
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Weight and terminal velocity

  • The weight of an object is the force acting on the object due to gravity. The mass is the quanity of matter in the object.
  • If there is only gravity acting on an object, then it will accelerate about 10m/s .
  • When an object falls, it eventually reaches terminal velocity. This happens when the weight equals the frictional force on the object. At this velocity, the resultant force on the object is zero.
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Forces and Braking

  • Friction and air resitance oppose the driving force of a vehicle
  • The stopping distance of a vehicle depends on the thinking distance and the braking distance.
  • Poor weather conditions, poor vehicle maintenance, and speed affect the braking distance. Poor reaction time and high speed both affect thinking distance.
  • You can work out the braking force of a vehicle using the equation below...
  • Force (N) = Mass (kg) x Acceleration (m/s )
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Forces and elasticity

  • An object is elastic if it returns to its orignial shape after you remove the force that you have used to deform it.
  • The extension of an object is the difference between the length when you stretch it and its original length
  • The externsion of a spring is directly  proportional to the force applied to it. This is only true if you do not go beyond the limit of elasticty. This is a linear relationship.
  • If you do go beyond the limit of elasticity then the relationship becomes non-linear and the force and extension are no longer propitional
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Comments

HKaur121

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it was a great resource and it really helped me to understand the topic before the lesson this way in lesson i was just revising what i already learnt. 

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