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Physics Help. Urgent Please Help?
2. A 25 kg chair initially at rest on a horizontal floor requires a 365 N horizontal force to set it in motion. Once the chair is in motion, a 327 N horizontal force keeps it moving at a constant velocity.
a. Find the coefficient of static friction between the chair and the floor
b. Find the coefficient of kinetic friction between the chair and the floor
3. A museum curator moves artifacts into place on many different display surfaces. Use the values in Table 4-1 to find F s^1 max and F k for the following situations
a. moving a 145 kg aluminum sculpture across a horizontal steel platform
b. pulling a 15 kg steel sword across a horizontal steel shield.
c. pushing a 250 kg wood bed on a wood floor.
d. sliding a 0.55 kg glass amulet on a glass display case
If anyone can help me do these problems that would be great! I did the rest of the problems but I had difficulty with these. Please help! It's urgent
2) If the floor is horizontal, then the normal force will equal the weight of the chair. Your model of friction uses a coefficient of friction and the normal force. For static friction, F(fr) <= u F(n), where u is my attempt at a lower-case Greek mu, the coefficient of static friction. The equality occurs when the chair starts to move. So,
u = F(fr)/F(n)
F(n) = W = mg = (25 kg)(9.80 m/s^2) = 245 N, so
u = 365N/245N = 1.49 (I'll let you worry about the significant digits.)
For kinetic friction, F(fr) = u F(n), so again
u = F(fr)/F(n) = 327 N/245 N = 1.33 (same comment about s.d.)
Note that the coefficient is dimensionless. They always are.
3) I don't have Table 4-1. Can't help you there. Just use the equations from number 2, though, and you'll have no worries.
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