3-Spr1-E

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Outcomes

  • Pupils can explain that drag increases with velocity
  • Pupils can appreciate why objects reach terminal velocity
  • Pupils can identify the factors which affect terminal velocity

Specification References

1.16 describe the forces acting on falling objects and explain why falling objects reach a terminal velocity

Starter

Guinea and Feather Demo - ask what will happen when we drop both in air. Then demonstrate the difference when both are dropped in a vacuum (using th evacuated tubes). Try to get the pupils to deduce what forces are acting. You can also show the Neil Armstrong video

OR

a)Drop a sheet of A4; falls slowly due to drag

b)Crumple it up; mass remains unchanged but falls quicker due to less drag

c)Place the A4 on a big book and drop; big book removes the effect of air resistance

d)Drop a ream of A4; all sheets fall at the same rate

Main Body of Lesson

Terminal velocity in Glycerol and Air:

1) Glycerol - demonstrate how tiny ball bearings achieve TV in glycerol. Can be made more visible with some white paper behind with unifromlly spaced lines on

2) Air - drop a parachute person with some PASCO tape on, should reach TV if dropped from high enough

Make notes on how velocity affects drag, terminal velocity and the classic skydiver example.

Plenary

Homework

Additional Information

Resources Required

Textbook References

Website References

Skills Addressed

Safety/Hazards

Notes