Remediation Blog Science 9

Class IX Subject Science (Physics) Chapter Sound Hello Learners, Welcome to today's class. Today we will learn about Sound. Enjoy your learning.... Link:  Worksheet for Practice: 1.   What is one Hz? 2.   What is the time period of sound wave? 3.   What is the minimum distance required to hear distinct echo? 4.   Why does sound become faint with distance? 5.   Give two applications of echo. 6.   Distinguish between tone, note, and noise. 7.   A sound has 13 crests and 15 troughs in 3 seconds. When the second crest is produced the first is        2 cm away from the source? Calculate        a. The wavelength        b. The frequency        c. The wave speed 8.   Explain structure of the human ear with the help of diagram. 9.   Given that sound travels in air at ...

Class IX Subject Science (Physics) Chapter Work and Energy Link: Worksheet for Practice: 1. Jenny uses 20 N of force to push a lawn mower 10 meters. How much work does she do? 2. Joe balances a stationary coin on the tip of his finger 20 cm from the top of the table. How much work is Joe doing? 3. Frank does 2400 J of work in climbing a set of stairs. If he does the work in 6 seconds, what is his power output? 4. How much power is required to pull a sled if you use 60 J of work in 5 seconds? 5. How much work does an elephant do while moving a circus wagon 20-meters with a pulling force of 200 N? 6. If it takes 5 seconds for you to do 1000 J of work, what is your power output? 7. A 900 N mountain climber scales a 100 m cliff. How much work is done by the mountain climber? 8. A small motor does 4000 J of work in 20 seconds. What is the power of the motor in watts? 9. A woman runs a kilo meter using a force of 210 N and a power output of 500 W. ...

CLASS IX Subject Science (Physics) Chapter: Gravitation Hello Learners, Welcome in today's class, Today we will learn about GRAVITATION. Link: Link:  Worksheet for Practice:

Hello Learners, Welcome to the class. Today, we will discuss Motion and Force and laws of Motion. Enjoy your class.                                              MOTION Speed is the distance travelled by an object in unit time is referred to as speed.  It is represented as                                                                    Acceleration: 2. Second Equation of Motion: (Position-Time Relation) 3.  Third Equation of Motion: Speed of an Object Moving on a Circular Path: WORKSHEET TO PRACTICE: 1. A train is travelling at a speed of 60 km/ h. Brakes are applied so as to produce a uniform acceleration of −0.5 m /s2. Find how far the train w...