revion topic 4 Flashcards
1
Q
what is centre mass?
A
the centre mass of an object is the point at which its mass may be thought to be concentrated
2
Q
what are moments?
A
its the turning effect of a force on an object
3
Q
how can moments of a force be increased?
A
- by increasing the force
2. using a spammer with a longer handle
4
Q
what is a load?
A
the weight of an object
5
Q
what is effort?
A
the force a person supplies
6
Q
what is a pivot
A
its the point which a crowbar turns
7
Q
what is a line of action?
A
its the line along which a force acts on
8
Q
moment=
A
force x distance
9
Q
principle of moments
A
the sum of all the clockwise moments at any point = the sum of all the anti-clockwise moments at any point
10
Q
how do you make an object more stable
A
- by having a lower centre of gravity
2. by having a wider base
