Physics day1

PSHS 3RD YEAR PHYSICSSESSION 1

PLS. BRING OUT YOUR BALLPEN AND CALCULATOR.

SUBJECT 1ST QTR GRADE

GOAL GRADE

TENTATIVE GRADE

1. WHAT ARE YOUR GOAL GRADES?

How to compute for your tentative grade?

1 2Previous Quarter (Tentative Grade)

3 3 Final Grade

TIME SUN MON TUE WED THU FRI SAT

5:30 am Wake up

Breakfast

6:30 am School

7 – 3pm Classes

3-3:40 ?

4-5:30 pm Review

? Rest

? Study time

2. WHAT IS YOUR DAILY SCHEDULE?

3. DO YOU FOLLOW YOUR SCHEDULE?

HOW MUCH DO YOU REALLY WANT TO IMPROVE YOUR GRADES?

1. Define your goals.

2. Make a plan.

3. Follow your plan.4. Revise.

THE KEY TO SUCCESS

Student A

Student B

Student C

Every 5 questions, 3 correct answers.

Every 3 questions, 2 are correct.

BATTING AVERAGE

Every 10 questions, 1 is correct.

6

# of CORRECT ITEMS

2 days=

3 days=

10 days=

6

10

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…

Diagnostics - Answers

E. MODELC. 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.

Diagnostics - Answers

D. PRECISIONF. DIMENSION OF A QUANTITY

3. Refers to the repeatability of the same measurement using a given instrument.

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.

Diagnostics - Answers

A. LAW

B. ACCURACY

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.

6. Refers to how close a measurement is to the true value.

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 ________

14,000,000,000years101.4 10 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

365 2414,000,000,000

1 160min 60sec

1 1min

days hrsyears

year day

hr

17

17

4.41504 10

4.4 10

STEP 1: Convert all measurements to the same unit.

METER

8. Express the following sum with the correct significant figures:

51.80 142.5 5.34 10m cm m

1________ 142.5

100m

m cmcm

1.425

56

1________ 5.34 10

1 10m

m mm

0.534

8. (cont’d)

STEP 2: Get the sum before converting to significant figures. Why?

To get the most ACCURATE result.

1.80 1.425 0.534

3.759

8. (cont’d) STEP 3: After adding, express the sum in significant

figures. SIGNIFICANT FIGURES: Rule for addition / subtraction:Among the given data, follow the LEAST NUMBER OF DECIMAL PLACES.

51.80 142.5 5.34 10m cm m

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.

REFLECT on your answer.

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?

ANSWER: There are two

times when the ball is at a height of 11.0m from the reference point.

10. (c.) Why are there two answers to 10b. ?

11. A projectile is fired with an initial speed of 65.2 m/s at an angle of above the horizontal on a long flat firing range. Determine:

(a.) the maximum height reached by the projectile.

11. (b.) the total time in the air.

11.( c.) the total horizontal distance covered.

11.(d.) the velocity of the projectile 1.50s after firing.

Get a support team.◦FAMILY, FRIENDS & TEACHERS.

Make your books and your calculator your friends! ◦ Make good use of them: READ YOUR BOOKS. KNOW HOW TO USE YOUR SCI CAL.◦ Take care of them.

SOME TIPS