At the local hockey rink,a puck with a mass of 0.12 kg is given an initial speed of v = 5.3 m>s.(a) If the coefficient of kinetic friction between the ice and the puckis 0.11, what distance d does the puck slide before coming to rest?(b) If the mass of the puck is doubled, does the frictional force Fexerted on the puck increase, decrease, or stay the same? Explain.(c) Does the stopping distance of the puck increase, decrease, orstay the same when its mass is doubled? Explain. (d) For the situation considered in part (a), show that Fd = 12mv2. (In Chapter 7we will see 12mv2 is the kinetic energy of an object.)

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.