Three balls (B1, B2, and B3) are shot as projectiles with same initialspeed. The angle of the three launches are 30°, 45° and 60°, respectively.The three balls each have the same mass,but the radii of B1, B2, and B3 are 2, 4 and 8 cm, respectively.The ranges of the three projectiles are R1, R2 and R3, respectively.Find a relationship between the ranges. (a) R1 >R2 > R3 (b) R2 > R1 > R3 (c) R1 = R2 = R3 (d) R1 = R3 < R2

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.