CBSE Assignment for Class 9 Science -Gravitation . Based on CBSE and CCE guidelines. The students should read these basic concepts to gain perfection which will help him to get more marks in CBSE examination.
Q 1 An object dropped from a height always fall towards earth. Why?
Q 2 Weight of an object on earth and moon is different. Why?
Q 3 In your daily life you experience force of gravitation. Give some examples,
Q 4 What is gravitation?
Q 5 State Newton‘s law of motion.
Q 6 What do you understand by centripetal force?
Q 7 What do you understand by gravitational force?
Q 8 What do you understand by free fall of an object?
Q 9 How does the force of gravitation between two objects change on reducing the distance to half?
Q 10 How will you calculate relative density of a cork using Archimedes‘s Principle?
Q 11 (i) How do fishes float in water?
(ii) Write the conditions that takes place when a solid is immersed in a fluid.
Q 12 The force on a phonogram needle of cross-section of radius of 0.01cm, is 1.5N. Find the pressure it exerts on the record in (i) Pa (ii) atm
Q 13 What do you understand by relative density? What is the unit of relative density? Manoj have a metal block of dimension 25cm x 10cm x 5cm. Now, if the mass of the block is 5kg, then calculate the greatest and least pressure exerted by the block?
Q 14 A piece of iron is totally immersed in water. If its density is 7.8 x 103kg/m3 and volume is 10-4m3 then calculate
(i) The upthrust
(ii) Apparent weight of iron piece in water
Please refer to attached file forCBSE Class 9 Gravitation