1. part A Examine the force versus displacement curve for the real spring below.

Question

1. part A

Examine the force versus displacement curve for the real spring below. Determine the energy stored in the spring if the maximum elastic force is 6.46 (N) when the displacement is 0.77 (m), and the minimum force 0.48 (N) found at zero displacement.    Remember to include units.

1. Part B

Which energy pie chart best describes the horizontal stretching of an ideal spring at three displacements (?x=0, ½m, 1m) (System = Earth, human, and spring).

1. Part C

Air resistance is present on a ball launched horizontally out a window, striking the ground ten seconds later. What will the air resistance do to the following system consisting of the spring, ball, Earth, air, and ground?

A. Reduce final energy of system.

B.Decrease the thermal energy of the system.

C.Heat up the air a very small amount.

D.Reduce the horizontal length traveled compared to no air resistance.

E. Reduce final impact velocity.

Will give full rate to the one who answer the questions clear/neat and correct.

Explanation / Answer

Part A: As F=-kx and E=0.5kx2 =0.5Fx =0.5*6.46*0.77=2.487 J (For Maximum elastic force )

E=0.5*0.48*0 =0 (For Minimum elastic force)

Part C: Reduce the horizontal length traveled compared to no air resistance,Since air will reduce horizontal velocity of ball (Option - D).

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