Moments, Levers and Gears - Paper 2 Flashcards
1
Q
Define moment
A
The moment due to a force is the turning effect of the force.
2
Q
What does a lever consist of?
A
- A pivot
- An effort
- A load
3
Q
Why are levers useful?
A
Levers, such as this one, make use of moments to act as a force multiplier.
They allow a larger force to act upon the load than is supplied by the effort, so it is easier to move large or heavy objects.
4
Q
Define gear
A
A gear is a wheel with a toothed edges that rotates on an axle or shaft.
5
Q
Do linked gears rotate in the same or opposite direction?
A
Opposite
6
Q
How do differently sized gears affect moments?
A
If the driven gear is made larger is will rotate more slowly but with a greater moment (low gear ratio).
If the driven gear is made smaller it will rotate more quickly but with a smaller moment (high gear ratio).
