force-levers Flashcards
Force=
Mass x acceleration
___ newtons of force are required for 1mm of p-a shear
260
newton’s first law of motion aka
law of inertia
law of inertia/first law
an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force
newton’s second law of motion aka
law of force and acceleration
newton’s second law of motion/force and acceleration states
the acceleration of an object depends directly upon the object and inversely upon the mass of object
newton third law of motion aka, and what it states
- law of action and reaction
- for every action there is an equal and opposite reaction
____ is the force that resists the sliding of to objects in contact
friction
___ stress is the intensity of force perpendicular to the surface on which it acts, while ___ stress is the intensity of force parallel to the surface on which it acts
normal
shear
____ friction exists when two contacting surfaces are not currently sliding relative to e/o but do possess the potential for movement
static
____ friction is in cases when two surfaces are already sliding relative to each other, aka dynamic
kinetic
____ is the magnitude of applied force acting over a given area, is measured in pascals
pressure
____ is performed when a object is displaced by the application of a force, measured in Jules
-can be Pos or neg
work
- the energy an object possesses due to motion is called
- will have none if the object is not moving
kinetic energy
type of motion of one object with respect to a reference object
relative motion
category of movement that has a definite beginning and end point
discrete
category of movement that has cycles of motion performed repeatedly with no well defined beginning or end points
continuous
category of motion that appears continuous but at the end of a stroke the body is not in a position to perform the next stroke
repeated discrete
category of movement that appears to be somewhat continuous in nature but are really a combination of discrete motions
serial
path of motion around a fixed axis and therefore in a circular path
angular MOTION
time rate of change of angular position of a rotating body, degrees or radians per unit of time
angular VELOCITY
time rate of change of angular velocity of a rotating body
angular ACCELERATION
the point about which body rotates
axis of rotation
perpendicular distance from a axis of rotation to a line which a force acts
lever arm (force arm, moment arm)
product of force and lever arm, the tendency of an eccentric force to rotate an object around an axis
torque
a ___ ___ consist of a rigid or semi rigid object that is capable of rotating about an axis (fulcrum)
lever system
lever type with the fulcrum between the effort and load/resistance
EF ^ LR
type 1
lever type with the load/resistance between the fulcrum and the effort
EF LR ^
type 2
lever type with the effort between the fulcrum and load/resistance
LR EF ^
type 3
see saw, claw hammer, scissors are all type __ levers
1
stapler, wheelbarrow, nut cracker are all type __ levers
2
fishing rod, broom, tweezers are all type ___ levers
3
