Forces Flashcards
Resultant force:
mass x acceleration
SI Base units for resulant force:
kgms^-2
Define the newton
force that will give a mass of 1kg an acceleration of 1 ms^-2
Define weight:
the gravitational force acting on an object through its centre of mass
Equation for weight:
mass x gravitational field strength
Define friction:
the force that arises when 2 surfaces rub against each other
Define drag:
the resistive force on an object travelling through a fluid
Define tension:
the force within a stretched cable or rope
Define upthrust:
the upward buoyancy force acting on an object when it’s in a fluid
Define normal contact force:
the force arising when an object rests against another object acting at a 90 angle to the plane of contact
What 3 factors does the magnitude of drag depend on?
1) Speed
2) Structure/Shape of object
3) Density of fluid
What is drag proportional to?
speed squared
When will drag stop increasing?
when equal to weight
What practical measures terminal velocity?
dropping ball through viscous liquid
Equation for moments:
force x perpendicular distance to pivot