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Introduction
In the unit 'Friction' # built on ~ existing knowledge of forces and learnt that forces can be measured and compared. The unit focused on friction as a force which exists between objects moving across solid surfaces and opposes motion, and the forces of air resistance and water resistance which oppose the motion of objects moving through air and water. ~ experimental and investigative work focused on * deciding what evidence ^ should collect when planning and carrying out a fair test, making ~ measurements using a forcemeter, looking for patterns in ~ results, interpreting and suggesting ~ own explanations for ~ findings. The work in this unit also offered * opportunities to relate ~ knowledge and understanding of frictional forces to everyday contexts and to recognise that science provides explanations for familiar phenomena related to friction.
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MeasuringForce
Section 2: Measuring force

^ has used a forcemeter to measure forces. ^ can read the scale accurately.
^ is able to explain that a bigger reading on the forcemeter shows it is more difficult to get an object moving than a smaller reading.
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SlidingObjects
Section 3: Sliding objects

^ is able to explain how the evidence ^ has collected answers the question ^ has set *self about friction.
^ can carry out a fair test.
^ is able to make measurements and construct a bar chart which matches the measurements.
^ is able to explain ~ experimental results orally or in writing.
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Friction
Section 4: Using friction

^ is able to group surfaces into 'high friction' and 'low friction'.
^ can give an everyday context eg holding the handlebars on a bicycle or pulling a drawer out of a desk and decide whether it is important for friction to be high or low.


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Resistance
Section 5: Water resistance

^ has described how ^ has carried out a fair test.
^ is able to identify which shapes move easily through water and explain this in terms of reduction of resistance.
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Air Resistance
Section 6: Air resistance & Section 7: Investigating parachutes

^ can explain in terms of forces why you need to pull hard on a large surface, eg a kite.
^ was able to describe a fair test to test different sized parachutes.
^ successfully measureed the amount of the time taken for the parachute to fall.
^ is able to explain the patterns in ~ results in terms of air resistance, e.g. the largest parachute took the longest because it trapped the most air which stopped it falling quickly. 


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