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assignment #001

????{???Vw??????Physics I

09-10-2006

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13:23:58

Briefly state what you think velocity is and how you think it is an example of a rate.

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RESPONSE -->

Velocity is the speed and direction of an object. It is an example of rate because rate often gives the distance and time.

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13:24:47

** A rate is a change in something divided by a change in something else.

This question concerns velocity, which is the rate of change of position: change in position divided by change in clock time. **

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RESPONSE -->

Rate - change in something divided by another change

Velocity - rate of change of position / change in pos. divided by change in time

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13:27:45

Given average speed and time interval how do you find distance moved?

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RESPONSE -->

You must multiply the average speed by the time interval.

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13:28:42

** You multiply average speed * time interval to find distance moved.

For example, 50 miles / hour * 3 hours = 150 miles. **

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RESPONSE -->

Avg. speed*time interval

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13:30:01

Given average speed and distance moved how do you find the corresponding time interval?

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RESPONSE -->

To find the time interval, you must divide the distance by the average speed.

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13:31:29

** time interval = distance / average speed. For example if we travel 100 miles at 50 mph it takes 2 hours--we divide the distance by the speed.

In symbols, if `ds = vAve * `dt then `dt = `ds/vAve.

Also note that (cm/s ) / s = cm/s^2, not sec, whereas cm / (cm/s) = cm * s / cm = s, as appropriate in a calculation of `dt. **

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RESPONSE -->

symbols:

`ds = vAve*`dt THEN `dt = `ds/vAve.

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13:31:57

Given time interval and distance moved how do you get average speed?

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RESPONSE -->

To find the average speed, you must divide the distance moved by the time interval.

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13:32:22

** Average speed = distance / change in clock time. This is the definition of average speed.

For example if we travel 300 miles in 5 hours we have been traveling at an average speed of 300 miles / 5 hours = 60 miles / hour. **

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RESPONSE -->

average speed = distance/change in clock time

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