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A 10.0-kg block is originaIly at rest on a frictionless table. A 2.5-kg block is placed on the 10.0-kg block, and a 11.0-N force puIls the 2.5-kg block a distance of 30.0 cm; the blocks, however, are free to continue moving. The coefficient of friction between the two blocks is μ k = 0.35. What is the change in internal energy of the two blocks (a) between the start when the blocks are at rest and the moment the applied force is discontinued, and (b) between the moment the applied force is discontinued and the time that the blocks are at rest relative to each other?
An automobile is moving along a highway. When the driver jams on the brakes, the kinetic energy of the car is converted into thermal energy due to the friction. Thus the loss of kinetic energy of the car appears in the form of thermal energy.
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