MindMap Gallery Measurement and mechanical movements
This is a mind map about measurement and mechanical movement, including the measurement of length and time, Errors and errors, mechanical movement and other knowledge points.
Edited at 2024-01-18 12:26:43This is a mind map about bacteria, and its main contents include: overview, morphology, types, structure, reproduction, distribution, application, and expansion. The summary is comprehensive and meticulous, suitable as review materials.
This is a mind map about plant asexual reproduction, and its main contents include: concept, spore reproduction, vegetative reproduction, tissue culture, and buds. The summary is comprehensive and meticulous, suitable as review materials.
This is a mind map about the reproductive development of animals, and its main contents include: insects, frogs, birds, sexual reproduction, and asexual reproduction. The summary is comprehensive and meticulous, suitable as review materials.
This is a mind map about bacteria, and its main contents include: overview, morphology, types, structure, reproduction, distribution, application, and expansion. The summary is comprehensive and meticulous, suitable as review materials.
This is a mind map about plant asexual reproduction, and its main contents include: concept, spore reproduction, vegetative reproduction, tissue culture, and buds. The summary is comprehensive and meticulous, suitable as review materials.
This is a mind map about the reproductive development of animals, and its main contents include: insects, frogs, birds, sexual reproduction, and asexual reproduction. The summary is comprehensive and meticulous, suitable as review materials.
Measurement and mechanical movements
Measurement of length and time
length
Unit conversion
Keep the number unchanged, record the rate, change the unit
Large unit → small unit, multiplication rate
Small unit → large unit, dividing rate
Measurement
tool
scale
before use
zero mark
Measuring range
Graduation value
when using it
put
Align - parallel - close - (stand sideways)
read
Vertical line of sight - estimation
remember
Value Unit
special law
accumulation method
L=Ltotal/n
Turn the curve into something straight
Inelastic cotton rope coincident curve
roller method
Circumference × number of turns
time
tool
stop watch
reading
Subdial (minutes)
Large dial (seconds)
One small division on the small dial lasts 30 seconds; one revolution on the large dial lasts 30 seconds and one small division lasts 0.1 seconds.
Errors and discrepancies
the difference
Mistakes can be avoided
Error is inevitable and can be reduced
Use more accurate tools
Improve measurement methods
Average multiple measurements
mechanical movement
definition
location changes over time
between objects
parts of the same object
relative position change
Reference object
Changes in position relative to the reference object
Movement relative to reference object
No position change relative to the reference object
stationary relative to reference object
The relativity of motion and rest
All objects are in motion - motion is absolute, rest is relative
Movement and stillness are judged by reference objects
speed
Compare movement speed
The time is the same, the longer the distance, the faster the movement
The distance is the same, the shorter the time, the faster the movement
Different times, different distances, comparing speeds
definition
distance to time ratio
Indicates the speed of movement
Formula (calculation formula)
v=s/t
s=vt
t=s/t
Conversion
1m/s=3.6km/h
Uniform linear motion
Direction remains unchanged, speed remains unchanged
The distance is proportional to time, and the speed is fixed
s-t image
The distance is the same, the shorter the time, the greater the speed (s is the same, t1<t2, v1>v2)
The time is the same, the longer the distance, the greater the speed (t is the same, s1<s2, v1>v2)
Inclined straight line - uniform linear motion Horizontal Line - Still intersection - encounter
Variable speed linear motion and average speed
subtopic