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Physics Topic 1: forces and motion (moment (force * distance (Nm),…
Physics Topic 1: forces and motion
density
mass
proportional成正比
gram (g)
kilogram (kg)
balance天平
volume
cubic meter (m3)
cubic centimeter (cm3)
litre (L)
measuring cylinder
Kg/m3
moment
force * distance
Nm
clockwise
顺时针
anticlockwise
逆时针
turning effect
Forces
unit
Newton
motion
distance/time graph
know how to read and draw
Y-axis: distance (m)
X-axis: time (s)
draw dots first, then lines
speed=distance/time
m/s
time = distance/speed
s
distance = speed * time
m
Hints
write equations
include units
different kinds of forces
gravity
Scientist
air resistance
friction
contact force
if equals, then balance
平衡
see saw
跷跷板
pressure
force/area
N/m2
how to measure
forcemeter
density = mass/volume