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00:00hi kids today we will learn about some more types of forces so let's get
00:08started in our previous lesson we learn forces can be contact forces and non
00:15contact forces and we learned some of them in detail now let's learn what is
00:23muscular force kids where do you have muscles it's in your body so muscular
00:32force is a force applied using our body parts like arms or legs if we push
00:39something or pick up something or throw something we are applying muscular force
00:46all our daily activities like sitting standing walking cycling playing
00:53swimming requires some muscular force and it's a contact force as it can move
01:01an object if it's in contact with the object we cannot move any object without
01:08touching it so it is contact force now let's learn what is buoyancy it is the
01:17force that keeps something floating do you ever wonder why certain things float
01:23while others sink when an object is woolly or partially immersed in water or
01:31any liquid an upward force acts on it which is known as buoyant force and this
01:39force prevents anything from sinking or let it float so buoyancy is ability to
01:47float some objects like a beach ball is very buoyant while some others like
01:54pebbles stones are not buoyant at all that is they just cannot float okay kids
02:03do you know what keeps the clouds floating in the air it's the buoyant
02:08force that keeps the clouds floating in the air you'll read more on it in your
02:13next grades now let's learn what is wind force it is the force of moving wind
02:22wind force is helpful to us in many ways but it can be destructive to wind force
02:29is helpful in flying kites driving sailboats flying parachutes flying
02:36gliders drying up clothes and many more hurricane hurricane is an extreme windy
02:46condition where the wind force is too high that it can be very destructive it
02:52can fly away houses cars and trees even big heavy ships it can become a reason
03:00for the sinking ships too it can lead to a huge loss to property and life now
03:09let's learn next force it's the force of moving water force of moving water
03:17can be used to sail boats it's used for rafting we are able to enjoy rides of
03:25water because of the force of moving water force of moving water is used in
03:33dams to produce electricity now let's learn another force and it is
03:41electrostatic force electrostatic force is the force of electrically charged
03:48objects take some small pieces of paper and a balloon filled with air now bring
03:59the balloon close to these papers what do you see these papers will stick to
04:09the balloon this is electrostatic force between the papers and the balloon which
04:18makes them stick to the balloon now take a comb and rub it on your head now
04:29bring it close to these papers what do you see the papers will stick to the
04:36comb or you can also lift the papers with a comb this is the electrostatic
04:43force between the papers and the comb that make the papers stick to the comb
04:50so this force picked up papers without touching them that is this is an
04:56invisible force so this is also an example of non-contact force so kids
05:05today we learned about some more force now you may go ahead and take a quiz to
05:11learn more bye-bye