Levers & Gears Flashcards
All 6 cards in this deck
What is a lever?
A rigid bar that turns about a pivot, used to transmit the turning effect of a force.
Where must the effort be applied on a lever for it to act as a force multiplier?
Further from the pivot than the load, so a small effort at a large distance gives the same moment as a large load at a small distance.
True or false? Moving the pivot of a lever closer to the load makes the load easier to lift.
True. The load's moment decreases and the effort acts at a greater distance, increasing the effort's moment.
Which way does the second gear turn in a pair of interlocking gears?
In the opposite direction to the first gear; the teeth push each other round.
What happens to turning effect and speed when a small gear drives a larger gear with more teeth?
The larger gear turns more slowly but with a greater turning effect (larger moment).
What are the steps to find how many turns per second a driven gear makes?
e.g. a 48-tooth gear turning 2 times per second drives a 12-tooth gear
- Teeth passing per second are the same for both gears:
- Divide by the teeth on the driven gear:
- turns each second