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# Physics day1

## on Oct 15, 2011

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PSHS 3rd Year (Batch 2013)...

PSHS 3rd Year (Batch 2013)
Physics Day 1 Tutorial Class
Test topic: Physics terms, Significant Figures, Uniform Linear Motion, Uniformly Accelerated Motion, Projectile Motion

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## Physics day1Presentation Transcript

• PSHS 3RD YEAR PHYSICS
SESSION 1
• PLS. BRING OUT YOUR BALLPEN AND CALCULATOR. 
• 2. WHAT IS YOUR DAILY SCHEDULE?
2. Make a plan.
4. Revise.
• THE KEY TO SUCCESS
# of CORRECT
ITEMS
BATTING AVERAGE
6
Every 5 questions,
Student A
2 days=
6
3 days=
Every 3 questions,
2 are correct.
Student B
10
10 days=
Every 10 questions,
1 is correct.
Student C
PERSISTENCE!
• The key to doing well in 3rd Yr is to PRACTICE. 
Change your 1st /2nd Yr Strategy!
• Let’s see what we remember in physics…
E. MODEL
C. THEORY
1. A kind of picture or analogy that helps to describe a phenomenon in terms of something we already know.
2. A broader and more detailed picture that aims to explain and order observations that has been tested and proven through experimentation.
4. Refers to the type of units or base quantities that make up a quantity. For example, for area, it is length. For velocity, we have length and time.
3. Refers to the repeatability of the same measurement using a given instrument.
D. PRECISION
F. DIMENSION OF A QUANTITY
6. Refers to how close a measurement is to the true value.
B. ACCURACY
A. LAW
5. Concise but general statements about how nature behaves, found experimentally valid over a wide range of observed phenomena. They usually take the form of a relationship or equation.
• 7. The age of the universe is thought to be about 14 billion years. Assuming two significant figures, write this in powers of ten in (a) years ________
• 7. The age of the universe is thought to be about 14 billion years. Assuming two significant figures, write this in powers of ten in (b) seconds ________
Dimensional Analysis
• STEP 1: Convert all measurements to the same unit.
METER
8. Express the following sum with the correct significant figures:
• 8. (cont’d)
STEP 2: Get the sum before converting to significant figures. Why?
To get the most ACCURATE result.
• 8. (cont’d)
STEP 3: After adding, express the sum in significant figures.
SIGNIFICANT FIGURES:
Among the given data,
follow the LEAST NUMBER OF DECIMAL PLACES.
3 significant figures. Therefore,
3.759  3.76 m
• 8. In summary
1. Convert all measurements to the same unit. (METERS, SECONDS, KILOGRAMS)
2. Get the sum before converting to significant figures.
3. After adding, express the sum in significant figures.
• 9. A car traveling 88 km/h is 110 m behind a truck traveling 75 km/h. How long will it take the care to reach the truck?
• 10. A stone is thrown vertically upward with a speed of 18.0 m/s. (a.) How fast is it moving when it reaches a height of 11.0m?
• 1. READ CAREFULLY. CHOOSE the object/s you are going to analyze.
DRAW A CAREFUL DIAGRAM showing what is happening to the object.
CHOOSE an origin and XY-COORDINATE SYSTEM.
LIST the known and unknown quantities.
THINK before jumping into the equations. APPLY the RELEVANT EQUATIONS.
PROBLEM-SOLVING TIPS
• 1. Acceleration and velocity are always in the same direction.
FALSE
2. An object thrown upward has zero acceleration at the highest point.
FALSE
True or False?
• 10. (b.) How long is required to reach this height, 11.0m?
• 10. (c.) Why are there two answers to 10b. ?