Year 8 Forces

Year 8 Forces Learning Objectives

Pupils should know:

Be able to calculate the distance travelled from the area under a speed/time graph
The difference between thinking distance and braking distance and factors that affect each.
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

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

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