12. A 2.00 kg object is initially at rest on a horizontal surface. An applied force of 30.0 N directed at -20° with respect to the x-direction acts on the object. The force of kinetic friction acts on the object once it is set into motion. a. What is the normal force acting on the mass? b. If the coefficient of kinetic friction is 0.250, what is the net force acting on the mass? c. What acceleration is produced in the case of part "b"?

12. A 2.00 kg object is initially at rest on a horizontal surface. An applied force of 30.0 N directed at -20° with respect to the x-direction acts on the object. The force of kinetic friction acts on the object once it is set into motion. a. What is the normal force acting on the mass? b. If the coefficient of kinetic friction is 0.250, what is the net force acting on the mass? c. What acceleration is produced in the case of part "b"?

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter5: Newton's Laws Of Motion

Section: Chapter Questions

Problem 74PQ: Starting from rest, a rectangular toy block with mass 300 g slides in 1.30 s all the way across a...

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Alternative formats
12. A 2.00 kg object is initially at rest on a horizontal surface. An applied
force of 30.0 N directed at -20° with respect to the x-direction acts on the
object. The force of kinetic friction acts on the object once it is set into motion.
a. What is the normal force acting on the mass?
b. If the coefficient of kinetic friction is 0.250, what is the net force acting on the
mass?
c. What acceleration is produced in the case of part "b"?
d. If the acceleration is actually 7.00 m/s2 i, what must the coefficient of kinetic
friction be assuming that everything else remains the same?
Answers: (a) 29.9 Nj (b) 20.7 Ni (c) 10.4 m/s2 i (d) 0.475
13. A 3.00 kg mass is pushed up an incline of 50° by a 35.0 N applied force
directed up the incline. The coefficient of kinetic friction Hetween the surfaces
24
a
mhp O

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