general forces

Question 1

which of newtons laws requires equilibrium

Answer 1

second law

Question 2

how can we calculate equilibrium

Answer 2

by calculating the sum of vectors which have to result with zero

Question 3

why do we use free body diagrams

Answer 3

to express a range of different forces that could be exerted on other bodies

Question 4

define a moment

Answer 4

the moment of a force depends on the size of the force and the perpendicular distance of its line of action from the axis of rotation

Question 5

what is the word equation for moments

Answer 5

force x distance or (perpendicular distance between the line of action of the force and the axis of rotation)

Question 6

what is the unit of a moment

Answer 6

Nm^-1

Question 7

why are moments different from joules

Answer 7

moments are a type of vector (clockwise or anticlockwise)

Question 8

what is the principal of moments

Answer 8

if a system in equilibrium, the sum of the clockwise moments must equal the sum of the anticlockwise moments