swami vivekanand public school sector 17 ......2020/04/23 · ans. short form of magnetic...

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SWAMI VIVEKANAND PUBLIC SCHOOL

SECTOR 17, HUDA JAGADHRI

GRADE 8

Date:23/04 /2020 Science Assignment-03 Ref: SVPS/K8/Sci_03

Topic: Force

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Q 24 Give example of use of magnetic force in transportation . Ans. Maglev Trains. Q25 What is Maglev? Ans. Short form of Magnetic Levitation. Q26 What does levitation means:- Ans. Its means rising and floating. Q27 Why Maglev trains move very fast. Ans. As there is no contact between the track and the vehicle , friction is reduced. This allows the train to move very fast. Q28 What is the purpose of making the train ‘flat’ above the tracks when it is moving forward? Ans. To reduce the friction and allowing the train to move very fast. Q29 Which force makes the earth move around the sun and the moon go around the earth. Ans. The gravitational force Q30 Why we weigh more on earth than on the mars Ans. We weigh more on the earth than on the mars because the force of gravity is greater on the earth than on the mars. Q31 Differentiate between weight and mass. Ans. Mass of an object remains same everywhere, whereas weight changes from place to place as gravity changes everywhere. Q32 Write the value of gravitational acceleration. Ans. g= 9.8m/s2=10m/s2 Q33 Write two natural phenomenon that involves action of electric charges. Ans. Thunder and lighting. Q 34 How static electricity is used in pollution control. Ans. static electricity is used on pollution control , by applying in a static charge to the dirt particles in the air and then collecting those charged particles on a plate or collector of the opposite electrical charge. Q35 Give two example of electrostatic force in air daily life. Ans. * When we sheet on a plastic chair sometimes we feel that the hairs on our body gets attracted and we feel an electric current.

Similarly when two balloons are rubbed against each other , they acquire same charges and thus they repel each other when brought closer to each other.

Q36 What is Torque ? Ans. The turning effect of a force is called as Torque. It is also known as the moment of force

swami vivekanand public school sector 17 ......2020/04/23 · ans. short form of magnetic...

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