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Friction Examples:
1. A box weighing 450 N is pulled along a level floor at constant speed by a horizontal rope. If the
tension in the rope is 260 N, find (a) the net force on the box, (b) the normal force on the box, (c) the
friction force on the box, and (d) the coefficient of kinetic friction.
2. A 75 kg box is pushed horizontally across a level floor with constant velocity. If the coefficient of
friction between the box and the floor is 0.38, find (a) the normal force on the box, (b) the friction
force on the box, and (c) the applied force pushing the box.
Friction Examples:
1. A box weighing 450 N is pulled along a level floor at constant speed by a horizontal rope. If the
tension in the rope is 260 N, find (a) the net force on the box, (b) the normal force on the box, (c) the
friction force on the box, and (d) the coefficient of kinetic friction.
2. A 75 kg box is pushed horizontally across a level floor with constant velocity. If the coefficient of
friction between the box and the floor is 0.38, find (a) the normal force on the box, (b) the friction
force on the box, and (c) the applied force pushing the box.
3. A 100 N force is exerted horizontally on a 24 kg crate to move it across the floor. If the coefficient of
friction is 0.35, find (a) the force of friction, (b) the net force on the crate, and (c) the crate’s
acceleration.
Formulas:
vav 
d
t
Fnet  ma
vav  12 vi  v f 
Fg  mg
v f  vi  at

Ff
FN
d  vi t  21 at 2
v 2f  vi2  2ad
1. (a) 0 (b) 450 N (c) 260 N (d) 0.578 2. (a) 735 N (b) 279.3 N (c) 279.3 N 3. (a) 82.32 N (b) 17.68 N (c) 0.737 m/s2
3. A 100 N force is exerted horizontally on a 24 kg crate to move it across the floor. If the coefficient of
friction is 0.35, find (a) the force of friction, (b) the net force on the crate, and (c) the crate’s
acceleration.
Formulas:
vav 
d
t
Fnet  ma
vav  12 vi  v f 
Fg  mg
v f  vi  at

Ff
FN
d  vi t  21 at 2
v 2f  vi2  2ad
1. (a) 0 (b) 450 N (c) 260 N (d) 0.578 2. (a) 735 N (b) 279.3 N (c) 279.3 N 3. (a) 82.32 N (b) 17.68 N (c) 0.737 m/s2
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