Chapter 4 - Forces in action Flashcards
what happens when a resistance force F acts on a body with mass M
the body will accelerate in the direction of the resultant force
what is drag
resistive force acting on an object when travelling through a fluid
what is terminal velocity
when forces on a falling object become balanced, so the resultant force is zero. acceleration becomes zero and the object is moving at maximum velocity
principle of moments
when sum of all anti clockwise moments is equal to the sum of all clockwise moments, for an object in equilibrium
what is a moment
a turning force
force x perpendicular distance
what is meant by a couple
a pair of equal and opposite forces, acting parallel but not on the same line to eachother
if there’s a uniform object, where would its centre of mass act
in the centre of the object
what is the force that an object submerged in a fluid experiences
an upwards force, called upthrust
archimedes’ principle
upthrust on an object = weight of fluid It displaces
