Forces and Motion

Stepwise evolution and emphasising change

Teaching Guidance for 14-16 Supporting Physics Teaching

Some values tell you how a system will evolve

Teacher Tip: Predicting the future, step by step, depends on knowing the values now and projecting forwards.

Expressed as a relationship, you'd get: quantitynew = quantityold + change

This business of change is so important that it's probably worth rearranging the relationship.

Teacher Tip: Make a point of emphasising that change = quantitynew − quantityold.

Knowing ainstantaneous and vinitial(1) allows you to guess what the vlater(1) will be after a short interval (the longer the interval, the riskier the guess), Δ tinterval(initial(1)_final(1)).

Knowing vinstantaneous and dinitial(2) allows you to guess what the dlater(2) will be will be after a short interval (the longer the interval, the riskier the guess), Δ tinterval(initial(2)_final(2)).

Using these instantaneous values to project forward in this way emphasises the fundamentals of kinematics, and uses the idea of accumulations.

appears in the relation F=ma a=dv/dt a=-(w^2)x
is used in analyses relating to Terminal Velocity
can be represented by Motion Graphs
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