Showing posts with label dynamics. Show all posts
Showing posts with label dynamics. Show all posts
Tuesday, September 28, 2010
Saturday, September 25, 2010
Dynamics Review
Hi Guys.
Last Friday in class we did some reviews in dynamics. We did the case questions 1,4,5.
Last Friday in class we did some reviews in dynamics. We did the case questions 1,4,5.
We also did the question from the book in page 196 from 1 to 3.
1. A copy of Physics: Concepts and Connections leaves the printing press and slides down a 4.0 m long ramp into the arms of an eager physics student. If the ramp is inclined at an angle of 25 degrees to the horizontal ans has a coefficient of kinetic friction of 0.10, how long will it take the 2.0 kg textbook to reach the student?
1. A copy of Physics: Concepts and Connections leaves the printing press and slides down a 4.0 m long ramp into the arms of an eager physics student. If the ramp is inclined at an angle of 25 degrees to the horizontal ans has a coefficient of kinetic friction of 0.10, how long will it take the 2.0 kg textbook to reach the student?
2. The plastic case from your least-favorite CD recording is flung up a frictionless ramp, inclined at an angle of 20 degrees to the horizontal. If the case leaves your hand at a speed of 4.0 m/s, how long will it take before the case comes to rest?
3. A skateboarder slides down a frictionless ramp inclined at an angle of 30 degrees to the horizontal. He then slides across a frictionless horizontal floor and begins to slide up a second inclined at an angle of 25 degrees to the horizontal. The skateboarder starts at a distance of 10 m from the bottom of the first incline. hoe far up the second incline will he go if the coefficient of kinetic friction on the second incline is 0.10?
Lastly, we did a worksheet on transparency.
Thursday, September 23, 2010
Hi Everyone!
Today we went over the "Dynamics Equlibrium Problems" worksheets. The answer is kinda blurred sorry guys i wrote it on pencil. 
After we went over the worksheets, we did the 2 questions on pages 13 (#2 and 4) Dynamics booklet (the rest of the answer is on the booklet on page 22) the answer of those 2 questions are:
After we went over the worksheets, we did the 2 questions on pages 13 (#2 and 4) Dynamics booklet (the rest of the answer is on the booklet on page 22) the answer of those 2 questions are:
Lastly, we went over The Atwood's Machine on page 11 and she gave us a yellow booklet about that lessons and ask to answer some question on that.
If you don't have the yellow sheets , see Ms. Kozoriz tomorrow.
Our test will be on Monday on this unit.
Wednesday, September 22, 2010
September 22
Hey
So today in class we did a lab showing the forces working on a block moving down an inclined plane. We needed to find the FORCE OF GRAVITY (Fw), FORCE OF PARALLEL (Fgx), FORCE OF PERPENDICULAR (Fgy), the ANGLE, and COEFFICIENT OF FRICTION (µ).
The Objective of the lab was to find the value of the coefficient of sliding function using an inclined plane
To learn the steps involved read page 19 in the Dynamics Unit
Questions
1.) Calculate Fgx, Fgy, and µ
Fgx = (sin24)(o.75N) [24 being the angle at which the block moved, and .75 being the force of the block]
Fgx = 0.31 N
Fgy = cos24(o.75N)
Fgy = 0.69N
The formula for finding µ is: µ = Fgx/Fgy
µ = 0.31N/0.69 N
µ = o.45
2.) Show that µ = tanθ
tan24 = 0.45
Next we read pages 172-179, and 194- 198, and doing questions 1-4 on pg 96 of the textbook
Questions
1.) A book leaves the printing press and slides down a 4.0m long ramp into the arms of a student. If the ramp is inclined at an angle of 25 degrees to the horizontal and has a coefficient of kinetic friction of 0.10, how long will it take the 2.0kg textbook to reach the student?
To be honest I don't know how to get the answer, so here's a basic diagram
For better information please as Ms. K.
So today in class we did a lab showing the forces working on a block moving down an inclined plane. We needed to find the FORCE OF GRAVITY (Fw), FORCE OF PARALLEL (Fgx), FORCE OF PERPENDICULAR (Fgy), the ANGLE, and COEFFICIENT OF FRICTION (µ).
The Objective of the lab was to find the value of the coefficient of sliding function using an inclined plane
To learn the steps involved read page 19 in the Dynamics Unit
Questions
1.) Calculate Fgx, Fgy, and µ
Fgx = (sin24)(o.75N) [24 being the angle at which the block moved, and .75 being the force of the block]
Fgx = 0.31 N
Fgy = cos24(o.75N)
Fgy = 0.69N
The formula for finding µ is: µ = Fgx/Fgy
µ = 0.31N/0.69 N
µ = o.45
2.) Show that µ = tanθ
tan24 = 0.45
Next we read pages 172-179, and 194- 198, and doing questions 1-4 on pg 96 of the textbook
Questions
1.) A book leaves the printing press and slides down a 4.0m long ramp into the arms of a student. If the ramp is inclined at an angle of 25 degrees to the horizontal and has a coefficient of kinetic friction of 0.10, how long will it take the 2.0kg textbook to reach the student?
To be honest I don't know how to get the answer, so here's a basic diagram
For better information please as Ms. K.
Monday, September 20, 2010
Monday, September 20, 2010
Grade 12 Physics: Dynamics Unit
Hi everyone.
Today in class we went over the 'Free-Body Diagrams' on pages 12 and 13 of the Dynamics booklet. Unfortunately I don't have a scanner. So if anyone has some images of those diagrams, please stick them here:
After that we went over the 'Static Equilibrium Problems' on page 16 and 17. The answers to those questions are:
1. Fg = 42N
2. FT = 980N
3. FT = 346N
4. FT = 281N
5. FT = 57N
On page 15 you'll find the 'Net Force' questions which we also did in class. To do these questions you must find the net force of the forces acting on a box.
Ex: 3N <---O----> 4N
Fnet = 3N, left + 4N, right
Fnet = 1N right
Hint: use the Pythagorean Theorem (c² = a² + b²) for triangular vectors.
Lastly we were assigned some problems on page 5 as homework.
Hi everyone.
Today in class we went over the 'Free-Body Diagrams' on pages 12 and 13 of the Dynamics booklet. Unfortunately I don't have a scanner. So if anyone has some images of those diagrams, please stick them here:
After that we went over the 'Static Equilibrium Problems' on page 16 and 17. The answers to those questions are:
1. Fg = 42N
2. FT = 980N
3. FT = 346N
4. FT = 281N
5. FT = 57N
On page 15 you'll find the 'Net Force' questions which we also did in class. To do these questions you must find the net force of the forces acting on a box.
Ex: 3N <---O----> 4N
Fnet = 3N, left + 4N, right
Fnet = 1N right
Hint: use the Pythagorean Theorem (c² = a² + b²) for triangular vectors.
Answers:
1. 0N
2. 1N, right
3. 5N, 53°
4. 5N, 217°
5. 5N, 53°
6. 5N, 217°
7. 10N, 45°
8. 10N 45°
9. 0N
10. 7N, 270°
1. 0N
2. 1N, right
3. 5N, 53°
4. 5N, 217°
5. 5N, 53°
6. 5N, 217°
7. 10N, 45°
8. 10N 45°
9. 0N
10. 7N, 270°
Lastly we were assigned some problems on page 5 as homework.
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