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Welcome to the physics review for semester one. Hello everybody, this is Dr. Fiala. The tutorial you are about to begin is comprehensive. Material reviewed includes Kinematics, force, projectiles, momentum and impulse. To receive the most benefit from this video there are two important points that should be noted.
Point one. I have color coded the slides so you can more easily practice skills with which you have difficulty. This is a good way for you to roll up your sweatpants. Word problems are presented on red slides. Data tables can be found on olive slides. Green slides work you graph reading skills and tan slides match concepts. Solutions are presented for each problem on the following slide. I will give you an audio cue that the slide will be changing. That way if you want to stop the video before you see the solution you can do so at that time. You may choose to view the entire video or simply move to the slide color representing your weakness.
Point two. You must have all of the formulas handy while going though the semester on physics review. If you have them written down in my order it would be helpful because I refer to the formulas as formula one, formula two, formula three and so on according to the order in which they appear on my card. Because all students must use the formula given out on final exam day, it is important that you are skilled at finding any variable in any formula. You can stop this video at any time and I encourage you do do so. I suggest that you complete this video review and tutorial when you can think about what we are talking about without distraction. Stay positive . You can do this!
One method of completing a data table is to find the pattern within the numbers for each object’s position. Since this is a data table of constant velocity, I know that whatever displacement occurs over one second is the same displacement that occurs for every other second thereafter. So the pattern for object number one is sixteen, thirty-two, forty-eight, and sixty-four. We can also think mathematically here. Since we have a data table of position change and time, we can apply the formula velocity equals position change divided by time. Still looking at the numbers for object number one found in column number one, we can take 48 meters and divide them by 3 seconds which is the time it took object one to travel 48 meters to find that object #1 has a constant velocity of 16 m/s. That means that the value in each row of the object #1 column increases by 16 each time.
Check your answers. I think you will find that you are better at this than you had originally thought you were.
Lets try this again only this time with constant acceleration. If we apply a constant acceleration we would expect the velocity to change over time. In fact, that is a shortened definition of acceleration. Again look for the pattern or apply a formula when you know initial velocity, final velocity, and time. If we look at object #3 we see a change of 1 m/s in 1 second. That means that during each second the object increases its velocity by 1 m/s.
This data table was a little harder only because there were some uneven numbers. For some of you that caused you to pause a little. Remember we are learning procedures here. To do the same thing, the same way, every time. If you stick to the procedure barring calculator error you should get the correct answer each time!
Lets try our hand at data table reading again. Each of the columns has a mathematical equation with which it is associated. Check your packet on projectile motion to reaffirm these equations.
Vertical position is found by the free fall equation, Yf = ½ gt2., since there is not initial velocity in the vertical. Horizontal position is found by the range equation Xf = Vit. Remember that horizontal velocity cannot change. Vertical velocity is found by using Vf = Vi + gt.
This completes this comprehensive review for the semester one final exam. Thank you for taking the time to review with me. If you have studied hard you deserve to do well. Good luck and have a nice day.
Transcript
1.
The slides used in this video are color coded. If
you are experiencing difficulty with one aspect of
your understanding than another you might find
this coding…
useful!
Slides with
Slides with tan
red
backgrounds
backgrounds involve
involve word matching Slides with
green
problems.
concepts.
backgrounds
Slides with olive involve
backgrounds
graphing.
involve reading
data tables.
2.
Time
(s)
1
Object #1
Object #2
Object #3
Object #4
Position (m) Position (m) Position (m) Position (m)
16
4
2
3
4
4
48
24
16
32
6
3.
Time
(s)
Object #1
Object #2
Object #3
Object #4
Position (m) Position (m) Position (m) Position (m)
1
16
4
8
2
2
32
8
16
4
3
48
12
24
6
4
64
16
32
8
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