Physics · Engineering Mechanics
In a screw jack, the load can be lifted with less effort (or the screw is self-locking/efficient depending on conditions) when the:
- 1helix angle is greater than the friction angle
- 2helix angle is equal to the friction angle
- 3helix angle is less than the friction angle✓
- 4screw is made of aluminium
Correct answer
helix angle is less than the friction angle
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