A wood bock weighs 100 N. (1) The block rests on a horizontal table top: (a) Wha

Question

A wood bock weighs 100 N. (1) The block rests on a horizontal table top: (a) What is the normal force excreted by the table? F_a = (b) What is the force of (stank) friction? f_1 = (2) The table top is liked to a 10 angle, but he block remains at rest (a) What is the normal force excreted by the table? F+a = (b) What is the force of (stank) friction? f_1 = (3) The table top is liked to a 30 angle, and the block still move; (a) What is the normal force excreted by the table? F_x = (b) What is the force of (stank) friction? f_1 = (4) Finally, when the table top is to a 40degree angle, the block slides with a 2 m/s_2 acceleration: (a) What is the normal force excreted b the table? F_a = (b) What is the force of (kinetic) friction? f_a =

Explanation / Answer

1.

normal = 100 N

friction =0 N

2.normal =mgcos(10)=100cos(10)=98.48 N

friction=100sin(10)=17.36 N

3.

normal=N=100cos(30)=86.6 N

friction=100sin(30)=50 N

4.taking g=10 m.s^2 for this case

normal=N=100cos(40)=76.6 N

friction=100sin(40)-(10*2)=44.28

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