Edexcel GCSE Design and Technology · 1DT0
Specification 1.5.6, 1.5.8 · Paper 1
Revise: Pulleys and BeltsRotational speed is usually expressed in revolutions per minute (rpm).
- Revise: Gear Types
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GCSE Design and Technology · key term
Revolutions per minute: the number of complete turns made in one minute.
Used by Edexcel
Specification 1.5.6, 1.5.8 · Paper 1
Revise: Pulleys and BeltsRotational speed is usually expressed in revolutions per minute (rpm).
Use the same units for both pulley diameters. Velocity ratio has no unit; rotational speeds are usually given in rpm.
Check the result: a larger driven gear should turn more slowly than its driver. Give rotational speed in rpm.
In a compound train, gears fixed to the same shaft have the same rpm, even if they have different numbers of teeth.
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