Additional Materials Section 4.11 6. -14 poin ts CJ10 4.P.039. A 58.0-kg crate r

Question

Additional Materials Section 4.11 6. -14 poin ts CJ10 4.P.039. A 58.0-kg crate rests on a level floor at a shipping dock. The coefficents of static and kinetic fiction are 0.780 and 0.460, respectively (a) What horizontal pushing force is required to just start the crate moving? (b) What horizontal pushing force is required to slide the crate across the dock at a constant speed? Additional Materials 7. 0 -14 points CJ10 4.P047 An 85.7-kg baseball player slides into second base. The coefficient of kinetic friction between the player and the ground is 0.47 (a) What is the magnitude of the frictional force?

Explanation / Answer

6)

a)

the applied force needed to start the crate moving is

Fmax = umg

Fmax = 0.780 x 58 kg x 9.81 m/s^2

Fmax = 443.8 N

b)

pushing force = Fk

Fk = umg

Fk = 0.460 x 58 kg x 9.81 m/s^2

Fk = 261.73 N

7)

a)

F = umg

F = 0.47 x 85.7 kg x 9.81m/s^2

F = 395 N

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