Chapter 4: Forces in Action Flashcards
what is mass
amount of matter there is in an object
what is weight
gravitational force acting on an object
what is the centre of gravity
the point from which an object’s total weight (or resultant gravitational force) will act
what is a Newton
force required to make an object of mass 1kg accelerate by 1ms^-2
what is tension
force within stretched object. the direction is opposite to the direction of stretching force
what is drag
friction acting in a fluid. direction is opposite to direction of motion
what is normal constant force
force of one object resting on another. surface being rested on exerts upward force on object
what is upthrust
force when object is floating in liquid, opposite direction to weight of object
what is the density formula
density = mass / volume
what is the pressure formula
Pressure = Force / Area
what is the pressure in a fluid formula
Pressure = density x acceleration of free fall x vertical height of column
what is Archimedes principle
the upthrust exerted on a body immersed in a fluid is equal to the weight of fluid that the body displaces
what is a moment
turning effect of a force
what is the moment formula
moment = force x perpendicular distance from pivot
what is a couple
Pair of equal but opposite forces that are parallel along different lines
