#Learn from home during stay – at – home
#Manovikas English Medium School, Margao.
# Standard Class 1:
STRAW BOATS
When an object enters water, two forces act upon it. There’s a downwards force (gravity) that’s determined by the object’s weight. There’s also an upward force (buoyancy) that’s determined by the weight of the water displaced by the object. An object will float if the gravitational (downward) force is less than the buoyancy (upward) force. So, in other words, an object will float if it weighs less than the amount of water it displaces.
A rock will sink while a huge boat will float. The rock is heavy, but it displaces only a little water. It sinks because its weight is greater than the weight of the small amount of water it displaces. A huge boat, on the other hand, will float because, even though it weighs a lot, it displaces a huge amount of water that weighs even more. Plus, boats are designed specifically so that they will displace enough water to assure that they’ll float easily.
LET’S TRY THE ACTIVITY: STRAW BOATS
Students who try the activities are requested to either email the images / video to csti@manoikas.in OR post those on facebook and tag CSTI Manovikas, Kindly mention your class and division.
#Learn from home during stay – at – home
#Manovikas English Medium School, Margao.
# Standard Class 2:
Air is required for burning
What’s going on?
We observe that the candle burns for some time and then goes off. This shows that the candle needs air to burn.
Air exerts pressure
What’s going on?
We observe that the cardboard does not fall. Even though the water tries to push the cardboard, the air outside pushes the cardboard, the air outside pushes the cardboard with greater force from below. This is air pressure.
Air is everywhere
Our planet is surrounded by air even though we can’t see it. Here are some simple ways to bring awareness and new appreciation for air.
Wave a Fan- Even though we can’t see air we can feel it on our skin. Using a variety of fans (hand fans, Electric fans and ceiling fans) explore the air around. It is cool? Hot?
LET’S TRY THE ACTIVITY:
1. AIR EXERTS PRESSURE
2. AIR IS REQUIRED FOR BURNING
3. AIR IS EVERYWHERE
Students who try the activities are requested to either email the images / video to csti@manoikas.in OR post those on facebook and tag CSTI Manovikas, Kindly mention your class and division.
#Learn from home during stay – at – home
#Manovikas English Medium School, Margao.
# Standard Class 3:
HOW DO WIND INSTRUMENTS MAKE SOUND?
In wind instruments, like the flute and trumpet, vibrating air makes the sound. The air particles move back and forth creating sound waves. Blowing across a flute’s blow whole sets up Slinky- like waves in the tube. In the clarinet, a vibrating reed (a thin piece of wood set in the mouthpiece) gets the wave started. Different pitches are played by pressing keys that open or close holes in the tube making the air column inside the tube longer or shorter. Longer air columns produce lower pitches.
HOW DO STRING INSTRUMENTS MAKE SOUNDS?
String instruments are played by pressing the fingers down on the strings. This pressure changes the strings’ length, causing them to vibrate at different frequencies and making different sounds. Shortening a string makes it sound higher. Strings produce different sounds depending on their thickness.
LET’S TRY THE ACTIVITY: A MEGAPHONE, Make your voice louder
Students who try the activities are requested to either email the images / video to csti@manoikas.in OR post those on facebook and tag CSTI Manovikas, Kindly mention your class and division.
#Learn from home during stay – at – home
#Manovikas English Medium School, Margao.
# Standard Class 4:
Center of Gravity
Centre of gravity, in physics, imaginary point in a body of matter where, for convenience in certain calculations, the total weight of the body may be thought to be concentrated. The concept is sometimes useful in designing static structures (e.g. building and bridges) or in predicting the behavior of a moving body when it is acted on by gravity.
In a uniform gravitational field the centre of gravity is identical to the centre of mass, a term preferred by physicist. The two do not always coincide, however. For example, the Moon’s centre of mass is very close to its geometric centre (it is not exact because the Moon is not a perfect uniform sphere), but its centre of gravity is slightly displaced towards the Earth because of the stronger gravitational force on the Moon’s near side.
The location of a body’s centre of gravity may coincide with the geometric centre of the body especially in a symmetrically shaped object composed of homogeneous material. An asymmetrical object composed of a variety of materials with different masses, however, is likely to have a centre of gravity located at some distance from its geometric centre. In some cases, such as hollow bodies or irregularly shaped objects, the center of gravity (or centre of mass) may occur in space at a point external to the physical material – e.g., in the centre of a tennis ball or between the leg of a chair.
Center of Gravity, the point at which all of the weight of an object appears to be concentrated. If an object rotates when thrown, the center of Gravity is also the centre of rotation. When an object is suspended so that it can move freely, its center of gravity is always directly below the point of suspension. An object can be balanced on a sharp point placed directly beneath its centre of gravity. It is impo0rtant for automobiles and trucks to have their centers of gravity located close to the road, because a low centre of gravity gives them stability.
LET’S TRY THE ACTIVITY:
1. USE A RULER TO CHECK THE CENTER OF GRAVITY
2. MAKE A SEA SAW AND SHOW CENTER OF GRAVITY
Students who try the activities are requested to either email the images / video to csti@manoikas.in OR post those on facebook and tag CSTI Manovikas, Kindly mention your class and division.
