Skip to main content

3rd Grade: Science : Force: muscular, gravitational, magnetic, frictional

Force  :

 Force is needed to pull or push something. Eg a bull pull a cart because it applies force. Thus , force can make things speed up, slow down, or change direction.

 Types of force:
Muscular force
Gravitational force
Magnetic force
Frictional force
Muscular force : what happens when you pedal your bicycle? The cycle moves. Your muscles apply force to the pedals.
Force applied by muscles is called muscular force.

 Gravitational force : when we throw a ball up in the air, it slows down and then falls to the ground. Fruits from a tree always fall to the ground . This is because the Earth pull everything towards its centre. 
The Force of the Earth that pulls everything towards itself is called gravitational force or gravity.

 Magnetic force: the magnet pulls iron objects towards itself , which then stick to the magnet . 
This pull of the magnet is called magnetic force.

 Frictional force : a bicycle has hand brakes on both wheels. When brakes are applied, they rub against the wheels. Friction between the brakes and the wheels slows down the bicycle. Sometimes to stop, you place your foot on the ground. The friction between the foot and the ground brings tthe bicycle to a halt.
Friçtion is the Force that stops or slow down a moving object.

Comments

Post a Comment

Popular posts from this blog

2ND GRADE : HINDI : BADSHAH KI RAJAI

 पाठ - प्रवेश     सूझबूझ  से हर समस्या  का  हल  निकलता  है ।        अकबर  के  दरबार  में बीरबल  विशेष  सलाहकार  थे । अन्य   दरबारी  इस  पद  को  लेना  चाहते  थे । बादशाह  अकबर  ये  जानते   थे । एक  दिन  अकबर  ने  घोषणा  की - सबकी  परीक्षा  होगी । जो   इस  परीक्षा  में  सफल  होगा , उसे  बीरबल  की  जगह  रख  लिया   जायेगा  ।         राजा - इस  रजाई  से  मुझे  सिर  से  पैर  तक  ढक दो ।   अन्य  दरबारी - लो , सिर  तोह  खुला  ही  रह  गया । यह  तुम्हारे   बस  की  बात  नहीं  है ।  अरे , सिर  ढका  तो पैर  खुल गए !  यह ...
4 comments
Read more

English Story :Gulliver In Lilliput

 Gulliver was a great sea lover. He lived in England with his wife and children. Although he was a physician, yet his love for the sea often led him to long sea voyages In the year 1712, during one such voyage, his ship named " The Antelope " was wrecked being caught in a violent storm. Gulliver , not seeing any fellow sailor around, had no choice but to move alone where the destiny would take him. Floating day and night on a broken piece  of the wrecked ship, he reached a lonely island. Exhausted with constant labour, he fell fast asleep. When Gulliver came out of his slumber, he was feeling quite hungry. To fetch himself with something to eat, he tried to get up but he couldn't. 'Oh Good! Why can't I move myself?' said Gulliver to himself. As he looked around, he discovered that he was fastened tightly with many fibre ropes from head to toe. Suddenly, he saw some mini creatures crawling on his legs and hands. Some of them even climbed his chest. Gullive...
Post a Comment
Read more

2ND GRADE : HINDI : CHUTKI CHIDIYA

                             चुटकी  चिड़िया     एक  दिन चुटकी  चिड़िया  उड़ते - उड़ते  बरगद  के  पेड़ पर  आकर   बैठ  गई । पेड़    पर कई  पक्षियों  के  घोंसले  थे । चुटकी  ने  सोचा -  मैं  भी  इसी  पेड़  पर अपना  घोंसला  बनाऊँगी ।          उसने  घास  फूस  और  तिनके  इकट्ठे  किए । बड़ी  मेहनत  से    एक  घोंसला  बना  लिया ।अब  चुटकी  अपने  घोंसले  में  आराम  से    रहने  लगी । रोज़  सुबह  वह  दाने  की  खोज  में जाती । शाम  को  घोंसलें   में  आकर  आराम  करती ।           एक  नटखट  बंदर  भी  उसी  पेड़  पर...
Post a Comment
Read more