Equillibrum Flashcards
A body is said to be in equilibrium when
Its not moving or the net force acting on it is zero
Conditions of equilibrium under the action of parallel coplanar forces
Total upwards force =Total downwards force,Sum of clockwise = sum of anticlockwise
The main conditions of equilibrium under parallel coplanar forces can be stated as follows
The algebraic sum of the upward forces = to the downward forces,(i.e the algebraic sum must be zero)
The algebraic sum of the moments of all all forces about any point on the obejct mu(the momental sum must be zero)
Moment of couple is the
The product Perpendicular distance between the two forces and and one of the force
Moment of a couple can be called
Torque
The centre of gravity of triangle is locTed at
2/3 of the height
When finding the C.G of any point what is made use of
A plumbline
A body is said to be in stable equilibrium when
It returns to the O.G point after being displaced
An example of stable is
A cone resting on its base
Unstable equilibrium is when a body
When slightly displaced tends to move further away from its position (tight tope walker,inverted bowl)
A body is said to be in neutral equilibrium when
Its slightly displaced and tends to come to rest in its new position (rolling cylinder or cone,a ball or sphere on a smooth horizontal table)
Which of the following make for the stability of a body
Wide base and low centre of gravity
Archimedes supports the fact that
The weight of fluid displaced is equal to its up thrust
When the weight of an objct is equal to the upthrust the principle said to occur is the
Principle of floatation
For a body to float the important facts to consider are the
Density and shape
A cork is sunk with the aid of a
Sinker
Device used for measuring relative density of a liquid is
Hydrometer
The main functions of an hydrometer is to
Check the function of acids in batteries,test the purity of liquids whose densities are known , testing the quality of milk
