ring lies on a horizontal table, and the left end of the spring isattached to a
ID: 1729946 • Letter: R
Question
ring lies on a horizontal table, and the left end of the spring isattached to a wall. The other end is connected to a box. The box ispulled to the right, stretching the spring. Static friction existsbetween the box and the table, so when the spring is stretched onlyby a small amount and the box is released, the box does not move.The mass of the box is 0.70 kg, and the spring has a springconstant of 78 N/m. The coefficient of static friction between thebox and the table on which it rests is s= 0.77. How far can the spring be stretched from its unstrainedposition without the box moving when it is released?Please help me solve this question!
Explanation / Answer
Given that the mass of box is m = 0.70 kg Force constant is K = 78 N/m The coefficient of staticfriction is s = 0.77 If the box not moving spring force balanced by thefrictional force s*mg = kx x = s*mg / k = 0.067 m = 6.7 cm = 67 mm
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