Topic 7

Question 1

BOS

Answer 1

Base of support = area defined by a line connecting the most peripheral points in contact with a surface

Question 2

COM

Answer 2

Centre of mass = point around which the mass & weight of a body are balanced
- point at which the force of gravity acts
- may be outside the body
- not always at centre of object

Question 3

LOG

Answer 3

Line of gravity = line of action of the force of gravity
- always acts at COM
- always directed downwards

Question 4

Concentric force

Answer 4

Force whos line of action passes through the COM of the body it acts on.
translation only, NO rotation

Question 5

Eccentric force

Answer 5

Force whose line of action is away from the COM of the body it acts on.
translation & rotation

Question 6

Force couple

Answer 6

equal, opposite, directed and parallel forces. Rotation ONLY

Question 7

Torque

Answer 7

the turning effect of a force. eccentric. vector (clockwise or anticlockwise).

Question 8

Torque formula

Answer 8

= applied force x moment arm.
CONVERT MA TO METRES

Question 9

Moment arm

Answer 9

perpendicular distance from the force to the axis of rotation.
smaller MA = less torque