Qualification > Sciences

AS PHYSICS UNIT 1

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The Golden Girl =D:

--- Quote from: Vampire-Love4ever on December 27, 2010, 11:58:39 am ---Hey,
I have some doubts. Please help me out here

Q1- Explain the experimental procedure to find centre of gravity of an irregular object.

Q2- If in a collision, the loss of kinetic energy is 0.08J.
Will it be elastic or inelastic collision?

Q3- How to use strobe photography or video camera to analyse motion?

Q4- What are coplanar vectors?

Q5- Application of mechanics for safety or to sports.

Q6- Explain the term of tensile/ compressive stress and breaking stress.


--- End quote ---

Q1 ] The materials needed were prepared. The shapes of regular object,
irregular object, a letter, and a number were cut out from the cardboard pieces.
Small holes at non-collinear points A, B, C were punched on each piece. A
cardboard piece was suspended by means of the nail-like support mounted on
the stand through the hole at point A. The cardboard was hung loosely from the
support. A plumb bob was suspended from the support with the cord extending
down in front of the cardboard. A line was drawn on the cardboard along the path
of the cord. The cardboard was removed and was suspended again through
another hole. The line was drawn again. The intersection of the two lines was
Page 5 0f 14 marked as C (the center of gravity). These steps were repeated for the other shapes indicated

Source :http://www.scribd.com/doc/6822863/center-of-gravity

the idea of this :
http://www.blurtit.com/q564403.html

Q2 : this is more of MECHANICS than Physics , so I really don't think it's a part of the Syllabus anymore

Q3 : Never heard of it  :o

Q4:
coplanar, is that points belong to the same plane

http://in.answers.yahoo.com/question/index?qid=20061003205708AADrwNX

and

http://www.meritnation.com/discuss/question/456953/what-is-coplanar-vector

Q5 : I don't Understand it and AS I Said in Q2.

Q6:
Tensile Strength/stress ; the Maximum Stress that the material withstands before breaking (fracturing)

http://www.tutorvista.com/physics/breaking-stress
and
http://www.tutorvista.com/physics/tensile-stress

I hope I helped =]  

elemis:

--- Quote from: Vampire-Love4ever on December 27, 2010, 11:58:39 am ---Hey,
I have some doubts. Please help me out here

Q1- Explain the experimental procedure to find centre of gravity of an irregular object.

Q2- If in a collision, the loss of kinetic energy is 0.08J.
Will it be elastic or inelastic collision?

Q3- How to use strobe photography or video camera to analyse motion?

Q4- What are coplanar vectors?

Q5- Application of mechanics for safety or to sports.

Q6- Explain the term of tensile/ compressive stress and breaking stress.


--- End quote ---

Take the irregular object and make a hole towards it's edge. Hang from the hole using a retort stand. Attach a plumb line to the hole and allow it to fall freely. Then trace the line made by the plumb line.

Redo this procedure twice over and where the lines intersect, that is the COG.

2. When there is a loss in KE with regards to a collison it is considered to be inelastic.

3. set the strobe camera to take a picture every 0.1s. Next place a vertical metre rule in front of the camera. Drop a ball from the top of the metre rule and at the same time start the camera.

Using the equations of motion speed, acceleration etc. Can be determined.

The Golden Girl =D:

--- Quote from: Vampire-Love4ever on December 27, 2010, 12:43:46 pm ---Q17- Draw a free body force diagram for a vertically ascending balloon. Label Upthrust, Drag and Weight.

--- End quote ---


Draw a DOT like I'm doing here :
                   ^ (Viscous) Drag
                   1
                   1  
                   1
                   ^ Upthrust
                   1
                   1
                   1
                   .
                   1
                   1
                   Arow going downward -> Weight



the one represents the Arrow ;)

elemis:
8. 5cos55 - F = 0

It is equal to zero since there is no acceleration.

Solving for F gives 2.87N

Vampire-Love4ever:

--- Quote from: ~ The Golden Girl  ~ on December 27, 2010, 01:05:06 pm ---
Draw a DOT like I'm doing here :
                   ^ (Viscous) Drag
                   1
                   1  
                   1
                   ^ Upthrust
                   1
                   1
                   1
.
                   1
                   1
                   Arow going downward -> Weight



the one represents the Arrow ;)

--- End quote ---

Firstly, thanks for your help :D
I have a question regarding this.
Why will the drag be upwards? Shouldn't it oppose the motion of the balloon and be downwards?

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