Principles Of Mechanics Flashcards
1
Q
What is a vector
A
A vector is any physical quantity that has a direction as well as a magnitude
2
Q
What is a scalar
A
A scalar is any physical quantity that is not directional
3
Q
What is a moment
A
The force x the perpendicular distance from the line of action to the pivot
4
Q
What is the principle of moments
A
For an object to be in equilibrium, the sum of the clockwise moments=the sum of the anticlockwise moments
5
Q
What is a centre of mass
A
The point through which a single force on the body had no turning effect
6
Q
What is a couple
A
A pair of equal and opposite forces acting in a body
7
Q
Newtons 1st law
A
Objects either stay at rest or move with constant velocity unless acted upon by a force
8
Q
Newton’s second law
A
F=ma
