Mechanics Flashcards
force definition
a push or pull on an object that attempts to change its motion, shape, or size
types of forces (4)
physically pushing or pulling an objects
magnets pushing or pulling
electric charges pushing and pulling
gravitational forces pulling objects together
inertia meaning
the property of an object to resist a change in motion from a force
what is inertia of an object related to?
its mass
S.I unit of forces
Newtons, N
examples of forces acting on a car
weight
friction
air resistance
reaction force
drive force
what is the resultant force
the sum of all the forces going in the same direction
weight formula
weight = mass x gravity
what is drag force and what happens to it when speed increases
drag force is an opposing force on objects moving through fluids
as speed increases the drag force also increases
force equation (related to mass and acceleration)
force = mass x acceleration
terminal velocity definition
the constant velocity of a falling object when the force of air resistance is equal in magnitude and opposite in direction to the force of gravity
equilibrium meaning
when there is zero total force applied to an object
moment of a force description
the rotational effect (turning effect) brought on a body due to application of forces
moment of a force definition
the product of the force and perpendicular distance from the pivot to the line of action of the force
moment of a force S.I. unit
Nm or Neuton metre
for anti-clockwise, use +Nm
for clockwise, use -Nm
