ection or magnitude
Machines help us make work easier. Simple machines are mechanical devices that change the _______________________ of a force
Six Simple Machines
Lever, Wheel and axle, Pulley, Inclined plane, Wedge, and Screw.
Each simple machine or mechanism within a complex machine...
direction or magnitude
Machines help us make work easier. Simple machines are mechanical devices that
change the _______________________ of a force
Six Simple Machines
Lever, Wheel and axle, Pulley, Inclined plane, Wedge, and Screw.
Each simple machine or mechanism within a complex machine is focused on making
the work easier by doing one of the following actions:
Increase the force applied to an object
Increase the speed or distance of a moving object
Change the direction of the applied force
Mechanical Advantage
The extent to which a machine facilitates an action is called the
greater, easier
The _____________ the mechanical advantage is, the _____________ the work
becomes
force produced and force applied
Generally, the mechanical advantage is the ratio between the _______________ by the
machine and the _________________ to the machine
greater, easier
The ____________ the Mechanical Advantage ratio is, the work becomes
_____________
Mechanical Advantage Formula
=Force produced (by the machine) / Force applied (to the machine)
lever
A __________ is a simple machine made with a bar that pivots on a surface point called
a fulcrum.
, effort arm
Force (input) is exerted upon one side of the bar called the
load arm
moves an object or load (output) on the other side of the bar called the ___________
Mechanical Advantage of a lever
Mechanical Advantage = Effort arm / Load arm
less effort, effort, load
The person requires _______________ than required when directly lifting the load, as
long as the _______ arm is greater than the _______ arm.
The rule of balanced weights of simple levers, as depicted by the image above, is a
ratio between the force (either weight or applied force) and the length of the arm:
F1D1 = F2D2 or in words:
Force of the load (Weight) Length of Load arm = Force of the work (Effort) Length of
Effort arm
faster, closer
As the lever moves on the fulcrum, points farther from this pivot move ________ than
points ____________ to the pivot.
examples of levers
scissors, a wheelbarrow, tweezers, bottle openers, and many more
1st class lever
the fulcrum is in the middle, the effort is applied on one side of the fulcrum and the load
is placed on the other side
1st class lever functions
use a long effort arm to lift a heavy load for a short distance using little effort (examples
are scissors, pliers, and a crowbar
to use the short effort arm with great effort to move a rather small load a large distance
(examples a catapult, and blob jumps). In this case, the mechanical advantage is less
than 1.
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