Momentum & Projectile Motion Test

Mom&Projtest

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Wednesday, October 8, 06

Today we basically worked on conservation of momentum assignment that was due. Also we started a new unit which is, named projectile motion, and a study guide on chapter 7 was handed out as well.


For those who don't really get the idea of "Elastic And Inelastic Collisions" here is a great website that precisely demonstrates how they're played out.

Physics Oct. 6, 2008

Today we corrected chapter 9 study guide fill-in-the-blanks, chapter 9 reteachings, the study guide questions, and the chapter 9 review. We were also assigned a conservation of momentum worksheet and our project on projectile motion by constructing a catapult.

October 1, 2008 Blog.

Double Scribed : Say thanks. ;P

Today in class we were given time to finish the lab previously assigned on the 30th of September. The lab was supposed to be handed in by the end of class. (By the way, the last question on the lab is confusing but if you think about the recoil it'll be alot easier).

We also corrected the questions in the "Duck Book".

50.
Jf = J1 + J2.
= (1/2 ( 100 N [G])) + [100N [E] (15s)]
= 250N + 1500 N
= 1750 N. [E]

b)
A= 1/2bh
= 1/2 (4.0x10^-2 s ) ( 15 N )
= 0.3 Ns.

c)
A=1/2bh
= 1/2(5)(-10)
= -25 Ns.

A2 = bh
= 12.5(-10)
= -125 Ns.

A3 = 1/2bh
= 1/2 (10)(-10)
= 1/2 (-100)
= - 50 Ns.

At = A1+A2+A3
= -200 Ns.

51.

(1/2 x - 90 x .03) + (120 x 0.2 ) + (1/2 x 75 x 0.4)
= 25.5 N.

Other than that? We were given extra assignments to help us get practice on the topic impulse and momentum.

Assignments / Homework :

1. IMPULSE AND MOMENTUM hand-out.
2. Complete "9 Study Guide."

That's pretty much it for the class besides me, Benchman and Lawrence having an arguement/discussion about the lab.

The next blogger like I said in the previous post I made will be chosen tomorrow.

September 30, 2008 Blog.

September 30 :

1. Corrected the first page of the "9 Study Guide".

Here are is the first page's answers :

1. B.
2. B.
3. B.
4. A.
5. D.
6. B.
7. D.
8. B.

Page 2 Answers (The back of the first page) :

9.
30 km/h right.
V = 0 m/s.
Impulse to the left.

10. V = 0 m/s.
V = 30 km/h.
Impulse to the right.

11. V = 0 m/s. (Backing up)
V2 = 5 m/s left.
Impulse to the left.

12. V = 5 km/h to the left.
V2 = 0 m/s.
Impulse to the right.

2. Completed a lab involving box carts and was due today.

The next blogger is : Anyone who wants to blog because I don't know who did or didn't.

Momentum and Our Dynamics Test

Okay this is Benofschool and this is the scribe for today.

We got our last test back and I am disappointed in my mark =(
Anyways here are the answers:

1.
2.
3. F_g = 103 N

4. F_|| = 11226 N

5. a= 1718.75 m/s² then use it to find F_resistance = -51.6 N

6a) F_n = 4410 N

b) F_a = 1500N

7a) F_|| = 94.5 N

b) F_n = 112.6 N then use it to find F_f = 24.7 N

c) F_net = 69.7 N

d) a = 4.65 m/s²


After correcting the test that I did horribly on we corrected chapter 9.1 study guide on Impulse and Change in Momentum

The blanks are filled in this order:

Momentum and Impulse
1) velocity 2) mass 3) mass 4) velocity 5) vector 6) the same as 7) p=mv 8) momentum

9) mass 10) velocity 11) kilogram x metre/ second 12) force 13) time interval 14) the same as

15) newton x second 16) momentum 17) impulse-momentum 16) second (2nd)

We were not required to do Angular Momentum

So then we received a 2 page booklet on Impulse and Momentum and I think should be done for tomorrow for homework.

This is the scribe for today and the next scribe will be Tony

First Week of Autumn

A dinosaur from the future came in to our class one day and ate the previous scribe. Then it ran away. Since the previous scribe is unable to scribe and I'm due for scribing anyways (yes, scribing is worth marks), I'm taking advantage of this blog drought as I do this post over the weekend. Here's an abbreviated overview of what we did Friday, September 26 to Monday, September 22nd.

FRIDAY, SEPTEMBER 26

• Redo Coefficient of Sliding Friction Lab
• Chapter 9 Study Guide (Impulse and Change in Momentum and The Conservation of Momentum) Worksheet (homework)
  
• Chapter 7 Momentum Worksheet (homework)
  

THURSDAY, SEPTEMBER 25

• Sang along to the M Times V song
• Watched Momentum Video (same-same guy) (5 points and hand-in)
  

WEDNESDAY, SEPTEMBER 24

• Dynamics Test

TUESDAY, SEPTEMBER 23

• Corrected Forces Review and Forces Evaluation: Using Concepts

MONDAY, SEPTEMBER 22

• Forces Review, Forces Enrichment, Forces Evaluation: Using Concepts, Frictional Forces, and Advanced Forces was assigned last Friday. These should be done by now.
• 5.2 Using Newton's Law: Read pp. 93-103. Questions #16, 18, 19, 22, 23 (pp. 123-126).
• 6.3 Application of Vectors: Read pp. 123-126. Questions #31, 35 (p. 131)

5.2 Using Newton’s Law Read pp. 98-103 Questions #16, 18, 19, 22, 23 (pp. 106-107)

16. You are driving a 2500.0-kg at a constant speed of 14.0 m/s along an icy, but straight and level road. While approaching a traffic light, it turns red. You slam on the brakes. Your wheels lock, the tires begin skidding, and the car slides to a halt in a distance of 25.0 m. What is the coefficient of sliding friction (μ) between your tires and the icy roadbed?

18. A 4500-kg helicopter accelerates upward at 2 m/s2. What lift force is exerted by the air on the propellers?

19. The maximum force a grocery bag can withstand and not rip is 250 N. If 20 kg of groceries are lifted from the floor to the table with an acceleration of 5 m/s2, will the bag hold?

22. A sled of mass 50 kg is pulled along snow-covered, flat ground. The static friction coefficient is 0.30, and the sliding friction coefficient is 0.10.
a. What does the sled weigh?
b. What force will be needed to start the sled moving?
c. What force is needed to keep the sled moving at a constant velocity?
d. Once moving, what total force must be applied to the sled to accelerate it 3.0 m/s2?

23. A force of 40 N accelerates a 5.0-kg block at 6.0 m/s2 along a horizontal surface.
a. How large is the frictional force?
b. What is the coefficient of friction?


6.3 Application of Vectors Read pp. 123-126 Questions #31, 35 (p. 131)

31. A street lamp weighs 150 N. It is supported equally by two wires that form an angle of 120° with each other.
a. What is the tension of each of these wires?
b. If the angle between the wires is reduced to 90.0°, what new force does each wire exert?

35. You slide a 325-N trunk up a 20.0° inclined plane with a constant velocity by exerting a force of 211 N parallel to the inclined plane.
a. What is the component of the trunk’s weight parallel to the plane?
b. What is the sum of your applied force, friction, and the parallel component of the trunk’s weight? Why?
c. What is the size and direction of the friction force?
d. What is the coefficient of friction?

Passing the baton to benofschool.

Shelly and erict, you guys forgot to label your labels on your previous scribe posts. ;)