Recognize the force acting in the following cases and mention whether they are contact or non-contact forces:
a. Artificial satellites revolve around the Earth with a fixed time period in specified orbits.
b. A ball rolling on the ground stops after sometime.
c. When a current is passed through a conductor the magnetic needle of a compass shows a deflection
d. A television screen collects dust easily.
e. A boy is standing holding a bucket of water in his hand.
Explain why the forces acting do not move the bucket in part (e).
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Answer:
a.gravitational force
b. friction force
c. magnetic force
d. static force
e.reaction force/gravitational force/tension force
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