8. 9 10, 13. 14. 15. 5, Please answer the following questions to the best of you

Question

8. 9 10, 13. 14. 15. 5, Please answer the following questions to the best of your ability. Show all work, including g rearranging of the equations (if necessary), and substitutions with units. Make sure your final ar units and number of significant figures. vens, finds, equations, 16. Jeff has to move a 65.0 kg wooden box across a wooden floor. a. Calculate the box's weight on Earth. (2) b. What is the coefficient of static friction of wood on wood? (1) c. What is the coefficient of kinetic friction of wood on wood? (1) d. What force must Jeff use to push the box across the floor with a constant velocity? (2) e. Jeff now wants to accelerate the box across the flor at a rate of 1.55 m/s? to the right i. Draw a free body diagram of the wood box. (2) ii. What net force is needed to produce this acceleration? (2) iti How much force must Jeff exert to produce this acceleration? (2)

Explanation / Answer

16 a] Weight on earth = mg = 65*9.8 = 637 N

b] coefficient of static friction of wood on wood = 0.25 to 0.50

c] coefficient of kinetic friction of wood on wood = 0.2

d] F = uk*mg = 0.2*637 = 127.4 N

e]i] draw a block, a right arrow for applied force (longer arrow) and a left arroe for friction (shorter)

ii] Net force = ma = 65*1.55 = 100.75 N

iii] Force applied = friction + ma = 127.4+100.75 = 228.15 N

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