Follow the link : http://www.physicsclassroom.com/Physics-Interactives/Waves-and
ID: 1507210 • Letter: F
Question
Follow the link :
http://www.physicsclassroom.com/Physics-Interactives/Waves-and-Sound/Mass-on-a-Spring/Mass-on-a-Spring-Interactive
Add the lightest weight ( 1kg) to a spring.
PART A: Describe the motion of the spring relative to the postion of the spring when no weight was added.
PART B: Repeat and now watch the changes in KE , PEgravity and PEspring. What happens as the spring oscillates up and down? Descried how each of these energies change through motion.
PART C: Now change the weight to 2kg and note any changes to the observations made in( a) and (b )
Watch the video : Muscle contraction Cycle Animation and answer:http://highered.mheducation.com/sites/0072495855/student_view0/chapter10/animation__breakdown_of_atp_and_cross-bridge_movement_during_muscle_contraction.html
PART D : Thinking of the myosin head as the object undergoing the Simple harmonic motion, at what location in the cycle does the myosin head have the highest potential energy. Explain where the energy is coming from.
PART E: Again thinking of the myosin head as the weight in #1, at what point do you believe it would have the highest kinetic energy ? (refer to both the simulation in #1 and the animation)
PART F: IF the oscillation of the weight of the spring is to adequately model Simple Harmonic motion and thus a muscle contraction. What must observe about the energy in the weight/spring system?
Explanation / Answer
A)
when no weight is attached the spring remains at rest and does not relative to the position of the spring as there is no force acting .
B)
as the spring is attached with 1 kg weight , the mass starts moving up and down about the equilibrium position. as the mass moves below the equilibrium position , its kE which is maximum at equilibrium starts decreasing . gravitational potential energy also decereses but the sping energy increases since the strecth in spring increase.