KINEMATICS - WordPress.com · 2020-04-20 · KINEMATICS 1 D MOTION. Frames of reference. A frame of...
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KINEMATICS
1 D MOTION
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Frames of reference.
A frame of reference is a set of coordinates that can be used to determine positions and velocities of objects in that frame; different frames of reference move relative to one another.
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● It is total path length of a moving particle.
● S I unit is meter
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● Displacement is a vector quantity and can be defined by using distance concept.
● It can be defined as distance between the initial point and final point of an object.
● It must be the shortest interval connecting the initial and final points, that is a straight line.
● S I unit is meter.
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SPEED
Speed can be defined as “how fast something moves” or it can be explained more scientifically
as “the distance covered in a unit of time”
It is a scalar quantity. We use a symbol v to show speed.
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Speed=distance/time
● From the above formula we can say that speed is directly proportional to the
distance and inversely proportional to the time.
● Motor vehicles commonly use kilometer per hour (km/h) as a unit of speed
however in short distances we can use meter per second (m/s) as a unit of speed.
● In my examples and explanations I will use m/s as a unit because it is S I unit of
speed.
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VELOCITY
● Velocity can be defined as “speed having direction”. As you can understand from the
definition velocity is a vector quantity having both magnitude and direction.
● We can define velocity as the “rate of change of displacement” whereas “the speed is
rate of change of distance”.
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● Average velocity can be defined as total displacement per total time taken.
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