Year 8 Forces

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Year 8 Forces Learning Objectives 

Pupils should know:

  • That speed is a measure of how far an object travels in a certain time
  • Average Speed = distance ÷ time
  • Speed is measured in units of metres per second (m/s)
  • How to convert km/hr to m/s
  • How to measure speed
     
  • The difference between thinking distance and braking distance and factors that affect each.
  • Be able to plot distance – time graphs
  • Be able to calculate the speed from the gradient of a distance – time graph
  • That acceleration is the rate of change of speed (velocity)
  • Be able to plot speed time graphs
  • Be able to calculate the distance travelled from the area under a speed time graph
  • Describe how the forces acting on an object falling at terminal velocity are balanced
  • That the area over which a force acts is important
  • Pressure = Force ÷ Area
  • That pressure is measured in Pascals (Pa) or N/m2 or N/cm2
  • How to convert N/cm2 to N/m2
  • Applications of high and low pressure
  • That solids transmit force but fluids (liquids and gases) transmit pressure
  • That in liquids:
    a. Pressure increases with depth
    b. Pressure acts equally in all directions
    c. Pressure is the same at any depth
  • How hydraulics use pressure
  • That a force may cause an object to rotate or turn about a point called a pivot
  • That the turning effect of a force is called the moment of the force
  • That the size of the turning effect depends upon the size of the force and the distance of the force from the pivot
  • Moment = force x distance to pivot
  • Moment is measured in units Nm or Ncm
  • That a moment may cause an object to rotate clockwise or anticlockwise
  • How to calculate the result of two or more moments applied to an object
  • That in equilibrium clockwise moments = anticlockwise moments
  • Some applications of moments such as levers and cranes

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