Last Friday we went over our homework that was due, which was a math sheet including work and power problems. The questions and answers to the math problems were:
1. How much work is done to move a box if the force applied to that box is 65.7N and it is moved a distance of 12.1 m?
W= Fd
W= 65.7N × 12.1 m
W= 794.97 J
2. If 75 J of work are used to move a motorcycle 3.64 m, what is the amount of force applied to that motorcycle?
F= W ÷ d
F= 75 J ÷ 3.64 m
F= 20.60N
3. If I have used 0.37 N on a marble and it has a work amount of 0.16 J, what is the distance that marble has gone?
d= W ÷ F
d= 0.16 J ÷ 0.37N
d= 0.43 m
4. A skateboarder does 438.84 J of work. If this occurs over a period of 21.8 seconds, how much power does that skateboarder use?
P= W ÷ t
P= 438.84 J ÷ 21.8 s
P= 20.13
5. A construction worker uses a running saw that weighs 35.28 N on a board that is 3.6 m long. If the power output of the saw is 6.35 W, what was the amount of time the saw was used?
W= Fd
W= 35.28N × 3.6 m
W= 127.01 J
t= W ÷ P
t= 127.01 J ÷ 6.35 W
t= 20s
6. How much work is applied to your backpack if 11W of power are used for 681 seconds?
W= P × t
W= 11W × 681 s
W= 7491 J
7. a. A soccer ball weighs 17.3N and can be kicked a distance of 7.5 m. What is the work applied to the soccer ball?
b. If the ball travels that distance in 2.4 seconds, what is the soccer player’s power?
a. W= Fd
W= 17.3N × 7.5 m
W= 129.75 J
b. P= W ÷ t
P= 129.75N ÷ 2.4s
P= 54.06 W
8. a. If a car’s motor weighs 12289.7 N and works at 530893.44 J, what is the distance the car has been moved?
b. Using the above number for work if the car is used for 15 minutes (!!!), how much power has the car used?
a. d= W ÷ F
d= 530,893.44 J ÷ 12,289.7 N
d= 43.2 m
b. P= W ÷ t
P= 530,893.44 J ÷ 900 s
P= 589.88 W
Afterwards, we were handed a project or visual presentation in relation to simple machines. The directions of the visual presentation are on Moodle and the attachment to the directions is under the 15th March-21st March called, Simple Machines Visual Representation Directions. The link to the Science page on Moodle is:
Pulley - Gio & Julia
Wheel & Axle - Viktor & Alix
Lever - Erik, Reza & Vance
Inclined Plane - Laura & Antonia
Screw - Cip & Bryce
Wedge - Kat & Emilie; Fabi & Iva
On Friday Ms. D Also reminded us that there will be a quiz coming up soon but it will surely not be until Thursday 18th. Our homework was to Finish our Superhero’s by Tuesday. That was all we covered in class on Friday, March 8th.
On Tuesday’s class we began by shortly and basically presenting our Superheroes that were due. All of the Superheroes looked terrific and interesting and so Ms. D announced that she will be hanging then outside in the hallway. After this we went to the upper computer lab and complete an activity Mr. Hays had asked us to check out and play around with. The website we explored was about Gizmos and it was called, Ants on a Slope! We did not only play with the website, we had a packet that we had to complete regarding friction and inclined planes! We had some hypotheses to answer and other activities! This is what we covered in class Friday 5th and Tuesday the 9th.
On the right is an idea of how Ants on a Slope looked like! The next scribe is Antonia!!! :)
Hey Iva,
ReplyDeleteI think that your scribe post was great because you explained the things we did on Tuesday well and clear. Fyi: I was sick that day. Second I would like to say that you did a good job by writing the q and a. I also think that you did well by doing diagrams for the types of simple machines. One more thing i think you did well was telling everyone which groups they were in. One thing I think you could improve is saying that it is you because it would be easier for the viewer. Instead of looking at the previous post they can look at yours.
Iva - you have covered the different days well. You have included the questions and answers for the math sheet and have made them stand out with different colors. Good listing of the groups for the simple machines project and the link to moodle is very helpful. I also like that you included a screen shot of Ants on a Slant - I will have to tell Mr. Hays. You have a few spelling errors, but over the post looks great!
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