s. A rock is thrown straight up from the surface of the Earth. The rock is suffi
ID: 1660426 • Letter: S
Question
s. A rock is thrown straight up from the surface of the Earth. The rock is sufficiently small that air resistance is negligible. Which one of the following statements describes the energy changes of the rock as it rises? a. The mechanical energy of the rock increases. b. The kinetic energy increases and the potential energy decreases c. The kinetic energy decreases and the potential energy increases. d. Both the kinetic energy and the potential energy of the rock remain the same. 6. Which of the following would not correspond to a smaller impulse received by a body during an interaction? (impulse is the change of momentum: a. A smaller time of interaction b. A smaller force involved in the interaction c. A smaller mass of the bady involved in the interaction d. A smaller velocity of the body after the interaction 7. The restoring force acting on a speing is not proportional to a. The change of position of the spring from its "natural position (equilibrium) b. The length of the spring c. The "stretch" of the spring d. The displacement of the spring from its equilibrium position 8. The coefficient of kinetic frictio.... a. is always smaller than the coefficient of static friction b. is always larger than the coefficient of static friction c is always equal to the coefficient of static friction d. can be larger or smaller than the coefficient of static friction, depending on the situation. 9. Conservation of energy applies to a. each type of energy in a closed system b. mechanical energy of a closed system c. total amount of energy in a closed system d. total amount of energy on Earth 10. Which of the following applies for an inelastic collision? a. Momentum is conserved, kinetic energy is conserved b. Momentum is conserved, kinetic energy is not conserved c. Momentum is not conserved, kinetic energy is conserverd d. Momentum is not conserved, kinetic energy is not conservedExplanation / Answer
5. the kinectic energy decrease and potential energy increases.
6. the smaller velocity of the body after interaction
7. length of the spring
8. is always smaller than the coefficient of static fiction
9 total amount of energy in the closed system
10. momentum is conserved kinectic energy is not conserved
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