Using Physics to make things work Flashcards
the moment of a force is a measure of what?
the turning effect of the force on an object.
what is the formula for a moment?
moment of F = F (force) × d (distance)
how do we increase the moment of a force?
you increase the force or the perpendicular distance from the line of action.
what is the centre of mass?
the point in an object where it’s mass is thought to be concentrated
when a suspended object is in equilibrium its centre of mass is where?
directly beneath the point of suspension.
the centre of mass on a symmetrical object is where?
along the axis of symmetry.
a seesaw at equilibrium has what?
equal and opposite forces acting upon it.
how can we increase the stability of an object?
by increasing its base size and getting the centre of mass as low as possible.
an object will topple over when?
when its centre of mass is beyond its base or pivot point.
an object topples over if (more technical)
the resultant moment about its point of turning is not zero
how is pressure defined?
as a force per unit area
a hydraulic system uses pressure how?
to exert a force
the velocity of a object moving ina circular motion at a constant speed is always what?
changing
why does the velocity constantly change on a constant speed of an object moving in circular motion
because the object is constantly changing direction
the centripetal acceleration acts where?
inwards towards the centre of the circle
