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P1.1-1.4 Motion(Benjamin) (Length and time (Lenth (1 dm=0.1 m, 1 cm=0.01 m…
P1.1-1.4 Motion(Benjamin)
Density
Mass➗Volumn
Mass and weight
Newton:the unit used for measuring forces
Weight: the force of gravity acting on a object
Gravitational field: the force to let us have weight
Differents between mass and weight
Mass tells you how much matter it is composed of
Weight is the gravitational force that act on it
Motion: speed and acceleration
Average speed=Total distance➗Total time
Speed-time graph, Distance-time graph
At rest
Moving with constant speed
Moving with changing speed
Speed-time graph's under area= Total distance
Acceleration: the rate of change of an object's velocity
change in velocity➗time taken
Length and time
Ruler, Micrometer, Measuring cylinder, Stop watch
Lenth
1 dm=0.1 m
1 cm=0.01 m
1 mm=0.001 m
1 um=0.000001 m
1 km=1000 m
How to use clocks
How to use ruler
The period time for a pendulum is the same
Volume
1 cm3=0.000001 m3
1 dm3=0.001 m3