To see eccentric contraction, look at the biceps curl with flexion around the elbow. As you lower a weight, you are working against resistance, letting the joint angle increase to lower that object under your control.The opposite is the concentric contraction were the arm is flexed upward to decrease the angle at the elbow.
It should not. A U-Joint that is worn will make a knocking sound when it starts or reverses.
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Begin by removing the tire and wheel from your Kia. Remove the ball joint retaining nuts. Pound the ball joint out with a hammer. Reverse the process to install your new ball joint.
Remove the tire and wheel. Remove the brake assembly and rotor. Remove the retaining nut from the ball joint. Pound the ball joint out with a hammer. Reverse the process to install the new ball joint.