Forces Level Descriptions

Level 4
Compare speeds of different objects
Describe how forces change movement
Give examples of streamlined objects
Identify the forces acting on an object
Describe how force can be spread out to lower pressure
Describe how force can be concentrated to increase pressure
Describe increasing the length of the lever can increase the turning effect of a force
Give an example of this
Describe how to balance a see-saw

Level 5/6
Describe the relationship between speed, distance and time
Link forces that act on an object with its movement
Explain how streamlining lowers resistance to air and water
Explain why resistance increases with speed
Relate resistance and speed to the particle model
Apply the ideas of unbalanced and balanced forces to falling objects
Summarise key ideas about pressure
Describe the relationship between force, area and pressure
Use this relationship when looking at solids, and within liquids and gases
Explain the action of levers
Describe the turning effect of a force and use the human skeleton as an example
Describe the principle of moments
Explain balance, using moments, and give examples, e.g. crane counterweight

Level 7
Use the definition of speed in calculations and conversions from different units
Relate the change in movement of an object to its mass and the forces acting on it
Use the particle theory to explain increased air resistance with speed
Use the definition of pressure in calculations to explain how a range of devices operate
Relate hydrostatic pressure in liquids and gases to density
Apply the principle of moments to a range of situations (including levers)