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Physics...help...????plEasE?
A museum curator moves artifacts into place on various different display surfaces. Use the values to find Fs,max and fk for the following.
a.) moving a 145kg aluminum sculpture across a horizontal steel platform. Aluminum on Steel - ,us 0.61 ,uk 0.47
b.) pulling a 15kg steel sword across a horizontal steel shield. Steel on Steel - ,us 0.74 ,uk 0.57
c.) pushing a 250kg wood bed on a horizontal wood floor. Wood on Wood - ,us 0.4 ,uk 0.2
d.) sliding a 0.55kg glass amulet on a horizontal glass display case. Glass on Glass - ,us 0.9 ,uk 0.4
Since every case is horizontal, you know that the normal force will be equal to the weight, W = mg. Your model for static friction is
Fs <= u Fn
The maximum value for the force of static friction, then, will be u(s) times the weight. In case (a), the maximum value will be
.61(145 kg)(9.80 m/s^2) = 870 N (to 2 significant digits)
Your model for the force of kinetic friction is similar:
Fk = u Fn
So, in case (a),
Fk = .47(145 kg)(9.80 m/s^2) = 670 N (again to 2 s.d.)
Do the same thing on all of the other problems.
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