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Chapter 8 Linear Kinematics
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Calculating the range of motion at the hip joint during stair ascent after
visually observing the movement is a quantitative analysis.
2.
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The motion of a parachutist in the air is an example of translational motion.
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The x and y axes in a two dimensional rectangular reference system are
always oriented vertically and horizontally, respectively.
The X and Yaxes in a twodimensional rectangular reference system are oriented in
any manner
 pg. 303
4.
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With a coordinate reference system originating at the hip joint, the axes of
the coordinate system will always be horizontal and vertical.
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A 3D reference frame has three axes.
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Speed is a scalar quantity.
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Acceleration is defined as the time rate of change of position.
Acceleration is defined as the rate of change of velocity with respect to time.
 pg.315
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Displacement is a scalar quantity.
Displacement is a vector
quantity.  pg. 308
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The slope of a line tangent to a curve indicates instantaneous velocity.
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Vectors can be added together graphically by placing the head of one vector
at the tail of the other vector.
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The area under a displacement time graph represents the average velocity.
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Positive acceleration relates to the direction of motion away from the origin.
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The point where the velocity is maximum in a velocity time graph indicates
the point where acceleration is maximum.
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Velocity is a measure of the area under the position time curve.
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The steepness of the slope of a velocity time curve is an indication of the
magnitude of the acceleration.
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Stride length is always measured from the heel contact of one foot to the heel
contact of the other foot.
Stride length is always measured from the heel contact of one foot to the heel contact
of the same
foot again.
–pg. 320
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F
The support phase in walking accounts for the same percentage of the total
cycle as in running.
The support phase in walking accounts for 60%
of the total cycle as in running.
–pg. 321
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Walking speed is increased by first increasing stride length and then stride
rate.
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Successful sprinters can usually increase their acceleration at the end of the
race.
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During running, stride length can affect metabolic cost.
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In a golf swing, the club head should be decelerating past contact with the
ball.
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Maximum acceleration of the club head occurs at the moment of impact in a
golf swing.
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Velocity of wheelchair propulsion is increased by increasing the length of
the push on the wheel.
Velocity of wheelchair propulsion is increased by increasing the frequency
of the
push on the wheel. –pg.
325
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Horizontal motion of a projectile is a special case of constant acceleration
and determines the range of the projectile.
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View Full DocumentHorizontal motion of a projectile is a special case of constant velocity
and determines
the range of the projectile. –pg. 328
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 Fall '09
 LiLi

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