A conservative force does positive work on an object as it moves from its initial position to its nal position. Which statement below correctly describes the change in the potential energy associated with the conservative force? The potential energy has decreased. 0 The change in the potential energy is zero. 0 The potential energy has increased. Initially, a large crate sits at the bottom of a ramp. You pull the crate up the ramp using a rope tied around the crate. a. As the crate moves up the ramp, does the gravitational force do positive work, negative work, or no work on the crate? O No work O Negative work 0 Positive work b. Has the gravitational potential energy ofthe crate increased, decreased, or remained the same as you pull it up the ramp? 0 U9 has decreased 0 U9 has increased 0 U9 remained the same A car drives T05 m on a road that is angled at 10.2\" above the horizontal. The car weighs 1.20 x1004 N. What is the change in the gravitational potential energy of the car as it drives 70.5 m? 0 833,000] 0 150,000] 0 833,000] 0 -'i 50,000] 0 -i,4?0,000j O 1,4?0,000J A 2.35 N weight is attached to the end of a 21.0 cm long string. You pull the mass out so that the string is perfectly horizontal, then let it go. What is the change in the gravitational potential energy ofthe mass from the point where you released it when it travels through the bottommost point of the swing? O 49.4] 0 .0494 ] O 0494 J O 4.34] O 4.34] A block that weighs 2.52 N is attached to the end of a spring that hangs vertically. The spring has a spring constant of 100 Mm. What is the change in the elastic potential energy of the springand mass system as the block falls from 4.99 cm above the equilibrium point of the block to 4.85 cm below it? O 0.242 J 0683 J 0 0.00689] 0 0.00689] 0 53.9 J A block slides down an inclined plane at a constant speed. a. Which forces act on the block as it slides down the incline? Select all that apply. O Spring (Fs) O Applied (Fa) O Tension (FT) Normal (FN) Gravitational (Fg) Static friction (fs) O Kinetic friction (fk) b. Which of the forces that act on the block are conservative? O Gravitational (Fg) O Normal (FN) O Kinetic friction (fk) O None of them