Mechanics Flashcards
scalar definition
only magnitude
vector definition
magnitude and direction
Newtons 1st law
an object will remain at a constant velocity unless acted upon by a resultant force
Newtons 2nd law
F=ma
Newtons 3rd law
Every action has an equal opposite reaction
Moment equation
moment=force x perpendicular distance from the pivot to the line of action of the force.
Principle of moments
if an object is in equilibrium sum of clockwise moments is equal to the sum of anticlockwise moments
an object is in equilibrium when..
it is not accelerating,
it is not rotating
Centre of gravity definition
the point through which the weight of an object appears to act
4 suvat equations, v, v’,s,s
v=at
s=ut+1/2 at’
v’=u’+2as
s =1/2(u+v)t
Projectile defintion
a moving object where the only significant force acting up on it is gravity
Conservation of energy
Energy cannot be created nor destroyed only transferred from one store to another.
work done equation
Work done (J) = force(N) x distance moved in direction of the force.
