SJS Science 8 ch 14 Li
Has all the stuff the Li's need to know for the final from ch 14
Terms in this set (44)
FD = ?
For ---- to be done, force must move an object
SI unit for work
The rate of doing work
To increase ------:
1. increase amount of work
2. Decrease amount of time
-------- = ?
SI unit for work
Another unit for power, equals to about 746 W
A device that changes force
1. Size of force
2. Direction of force
3. Distance of force
- to make work easier
The force you exert on a machine
The distance the input force acts over
The work done by the input force acting over the input distance
(input force)(input distance) = ?
The force exerted by a machine
The distance the output force is exerted through
(output force)(output distance) = ?
The number of times a machine increases an input force
----------------- = ?
------------------- = ?
The percentage of work input that becomes work output, is always less than 100%
--------------- x 100%
2. Wheel and axles
3. Inclined planes
A rigid bar that moves around a fulcrum
The fixed point a lever rotates around
The distance between the INPUT FORCE and FULCRUM
The distance between the OUTPUT FORCE and FULCRUM
IMA of a lever
------------- = ?
Type of lever in which the fulcrum is in between the resistance and input force (FRE)
Type of lever in which the resistance (output force) is in between the fulcrum and input force (FRE)
Type of lever in which the input force is located in between the resistance and output force (FRE)
Wheel and axle
Simple machine which consists of two disks or cylinders with different radii
IMA of a wheel and axle
Radius of input force
---------------------------- = ?
Radius of output force
A slanted surface along which a force moves an object to a different elevation
IMA of an inclined plane
--------------------- = ?
Change in height
A V-shaped object whose sides are two inclined planes sloped towards each other
IMA of a wedge
The thickness of a wedge determines the ----
An inclined plane wrapped around a cylinder
IMA of a screw
Number of threads per distance = ?
Simple machine that consists of a rope that fits into a groove in a wheel
IMA of a pulley
The number of rope sections supporting the load
A wheel attached in a fixed location and is only able to rotate in place
A pulley that is attached to the object and can move and is not fixed
A combination of two or more simple machines that operate together