Machines Flashcards
(8 cards)
1
Q
What is a moment?
A
Turning force about a pivot. They will act in clockwise/anti-clockwise direction
2
Q
When in equilibrium..
A
The anti-clockwise moments = the clockwise moments about a pivot
3
Q
Calculation for a moment
A
Moment (Nm) = Force(N) x distance from pivot(m)
4
Q
How do you find the effort in a pulley?
A
Effort = load/no. of ropes
5
Q
How do you find a class 1 lever?
A
The pivot is in between the load and effort eg a bottle opener
6
Q
How do you find a class 2 lever?
A
The pivot is on one end, closer to the load eg a wheel barrow
7
Q
How do you find a class 3 lever?
A
The pivot is on one end, closer to the effort eg an arm lifting a ball
8
Q
How do you find out the weight a pulley diagram is lifting?
A
Weight=effort x number of ropes
