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Chapter 4 Linear motion

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Chapter 4 Linear motion - PowerPoint PPT Presentation


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Chapter 4 Linear motion. 1) Linear means in a straight line. 2) Describe the motion of an object by its position, speed, direction and acceleration. 3) Distance is a scalar. Distance is “how much ground is covered” during motion.

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6 motion is relative an object is moving if its position relative to a fixed point is changing

6) Motion is relative.An object is moving if its position relative to a fixed point is changing.

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7) Example: A crate on a train traveling at 20 m/sec. The crate is at rest wrt the train.But the crate is moving 20 m/sec relative to the ground.

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10) From motion experiments, Galileo defined Speed = distance/time11) Before Galileo, motion was simply described as “fast” or “slow”

12 instantaneous speed is the speed at any instant 13 a speedometer shows instantaneous speed
12) Instantaneous speed is the speed at any instant.13) A speedometer shows instantaneous speed.
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18) Acceleration is the rate of change of velocityacceleration is a vector.19) acceleration = change of velocity time interval

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22) projectile: an object that moves only under the influence of gravity.23) Free fall = object falling under influence of gravity.

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29)Kinematics variables for free falling object, Y = final position in y directionYo = initial position in y directionVoy = initial velocity in y directionVfy = final velocity in y directionay = -gt = time elapsed