Supplementary Problems
Test Your Understanding of Friction!
1. The 15 kg block is moving
at a constant 15 m/s on the rough horizontal surface (µk
= 0.172). Find the normal force:
Ans. 147 N
2. A rope is used to apply a
force of 85 N as shown to the 15 kg block on the rough horizontal surface
(µs = 0.538; µk = 0.172). After a few
seconds of application of the tension, find the normal force and the frictional
force:
Ans. N = 106.6 N
f = 18.3 N
3. Two ropes are used to apply
forces of 85 N and 43.1 N as shown to the 15 kg block on the rough horizontal
surface (µs = 0.781; µk = 0.172). After
a few seconds of application of the tension, find the normal force and
the frictional force:
