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basic mechanics 2
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basic mechanics 2
basic mechanics chapter 2
Question  Answer 

There are ______________ classifications for the different typers of levers.  Three 
The location of the lever fulcrum in relation to the load and applied fore determines the _________________ of levers.  Classification 
A lever which has the fulcrum between the applied force and the load is called a _______________________ lever.  Firstclass 
A lever with the fulcrum located at the end of the bar can have either a ___________________ lever of a _________________________ lever.  Two; secondclass; third class 
When using a firstclass lever, the amount of weight or force and the _______________ fromthe fulcrum can be varied according to the need.  Distance 
In order to have a balanced state with a firstclass lever, the___________ on one side of the fulcrum times the distance from the ____________ on that side must equal the ____________ on the other side multiplied by its__________ from the fulcrum.  weight; fulcrum; weight; distance 
if a maintenance mechanic desires to lift a 200 pound generator off the ground using a lever as the lifting device, he must place a fulcrum under the lever, If a fulcrum is placed three feet from the end of the liver lifting the generator, and the leveris  120 pounds; exactly 120 pounds would only balance the lever 
Secondclass levers always have the load attached between the ___________ and the __________.  Fulcrum; applied force 
Secondclass levers are normally employed to provide a mechanical _____________ when attempting to lift a load.  advantage 
After attaching a load to a secondclass lever, you find you have sufficient force to lift the load, but cannot raise the load high enough to get a dolly under it. To correct this situation, you should move the load____________ toward the __________.  Outward: applied force 
After attaching a load to a secondclass lever, you find you have sufficient force to lift the load, but cannot raise the load high enough to get a dolly under it. To correct this situation, you should move the load____________ toward the __________.  Outward: applied force 
If a load weighing three pounds is attached on inch from the fulcrum of a sixinch secondclass lever, how much force is required to lift the weight?  0.5 pounds (3x1 = 3 and 0.5 x 6 = 3) 
The applied force of a thirdclass lever can never be __________ than the force exerted by the load itself.  less 
Thirdclass levers provide a mechanical advantage in that they can vary the __________ and ___________ that a load moves.  speed; distance 
The greater the distance between the applied force and the fulcrum, the ___________ speed of movement the load will have.  less 
The closer the applied force is to the fulcrum of a thirdclass lever, the ___________ the distance in travel of the load.  Greater 
The steering Wheel of an automobile is a good example of a ______________ or ______________________________ machine.  Crank; wheel and axle 
The wheelandaxle machine works much on the same principle as that of a _____________.  Lever 
Torque is determined in a simple wheelandaxle machine by Multiplying the __________ ______________ times the ______________ from the center of rotation.  radius; axle 
gears can be used to ________ or ________ force, increase or decrease _______________, or change the _____________ or motion.  magnify; reduce; speed; direction 
When a force is applied to the smaller of two gears, the resultant output speed will be _____________.  decreased 
Dividing the number of teeth on the driver gear by the number of teeth on the driven gear will determine the multiplier for computing an increase of decrease in ______________.  speed 
Dividing the number of teeth on the driven gear by the number of teeth on the driver gear will determine the multiplier for computing an increase or decrease in ___________________.  Touque or force 
A particular gear arrangement that provides for a reduction in speed of applied force will have the effect of _____________ the amount of force applied.  increasing 
A gear arrangement that provides for an increase between input and output force will also have the effect of ___________ the speed of the applied force.  Decreasing 
Gears (do/do not) _________ need to be of different sizes to cause an increase of decrease in speed and / or force.  do 
Gears (do/do not) __________ need to be of the same size to cause a change in direction of applied force.  Do not 
An inclined plane is primarily used to reduce the force necessary to ___________ or ___________ a weighted object.  Raise; lower 
If a ramp is six times as ling as it is high, the mechanical advantage of using the ramp is _______________,  six 
Computer the force necessary to roll a barrel weighing 500 pounds up a 15 foot inclined plane to a height of 6 feet. How much force is necessary?  200 pounds ( 500 x 6 = 3000 and 3000 divided by 15 = 200 
To multiply the length of a jack handle by 2 x 3.14, you are determining the radius of a jack handle are, You can use this figure to determine the ______ _______ of the jack by further dividing this product of 2 P;R by the pitch of the jack screw.  Mechanical advantage 
Determine the lifting capabililty of a screw jack that has a 100pound force applied to a 36inch jack handle. Assume the screw pitch of the jack to be 1/8 inch. Also assume that the construction of the jack is such that it will not collapse under the str  approximately 30.4 tons (2x 3.14 x 36 divided by 1\8 (or .125) = 1808.64 x 100 divided by 2000=90.4 approximately 
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