Moments Flashcards
1
Q
a moment =
A
a turning effect of a force
2
Q
moments (N/m) =
A
force (N) x distance (m)
3
Q
Moments units =
A
Nm
4
Q
center of gravity =
A
the point where all the mass of the object is concentrated
5
Q
An object’s weight acts throughout …
A
the center of the mass
6
Q
Principle of moments :
A
When in equilibrium, the total sum of the anti-clockwise moment is equal to the sum of the clockwise moment
7
Q
Purpose of a counterweight of a crane.
A
To prevent the crane from toppling over, concrete blocks are suspended at the other end of the jib (the horizontal arm used to lift heavy building materials). They act as a counter-weight to create a moment that opposes the moment of the load
8
Q
Design and write up an experiment to locate the COM of an object.
A
- Hang up the object
- Suspend a mass from the same place
- Mark the position of the thread
- The center of the mass is somewhere along the line of the thread
- Repeat steps 1-3 with the object suspended from a different place.
