Refer to the system in question #6. What force (acting along the surface) is needed to accelerate the object with a magnitude of 2 m/s2? Assume that it was already moving, and the maximum static friction force was already overcome. A. 31 N B. 62 N C. 80 N D. 89 N

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PLEASE help me with the two questions. These are the only two I need help with and this is my last question until November. Please solve number #7 from the information in 6, and please solve question #9 from the information in number 8. THANK YOU PLEASE HELP!!

6.
An object with 9.0 kg of mass is on a horizontal surface. The coefficients of friction
between the object and the surface are μ = 0.9 and μ = 0.7. What is the maximum
force, exerted along the plane of the surface, that can be exerted on the object and not
move it?
A. 54 N
B. 72 N
C. 79 N
D. 86 N
7.
Refer to the system in question #6. What force (acting along the surface) is needed to
accelerate the object with a magnitude of 2 m/s2? Assume that it was already moving,
and the maximum static friction force was already overcome.
A. 31 N
B. 62 N
C. 80 N
D. 89 N
Transcribed Image Text:6. An object with 9.0 kg of mass is on a horizontal surface. The coefficients of friction between the object and the surface are μ = 0.9 and μ = 0.7. What is the maximum force, exerted along the plane of the surface, that can be exerted on the object and not move it? A. 54 N B. 72 N C. 79 N D. 86 N 7. Refer to the system in question #6. What force (acting along the surface) is needed to accelerate the object with a magnitude of 2 m/s2? Assume that it was already moving, and the maximum static friction force was already overcome. A. 31 N B. 62 N C. 80 N D. 89 N
8.
A small block of wood is at rest on a larger block of wood. The large block is at rest on
a table surface. If someone begins pushing the lower block to the right which of the
following cannot occur?
A. Both blocks will remain at rest
B. Both blocks will accelerate
C. One block will accelerate and the other will have close to zero acceleration.
D. Each block will accelerate differently
E. The blocks will accelerate differently in opposite directions
9.
Determine the number of normal forces acting on the larger piece of wood in question
#8 prior to the force applied by the person.
A. 1
B. 2
C. 3
D. 4
10:33
Transcribed Image Text:8. A small block of wood is at rest on a larger block of wood. The large block is at rest on a table surface. If someone begins pushing the lower block to the right which of the following cannot occur? A. Both blocks will remain at rest B. Both blocks will accelerate C. One block will accelerate and the other will have close to zero acceleration. D. Each block will accelerate differently E. The blocks will accelerate differently in opposite directions 9. Determine the number of normal forces acting on the larger piece of wood in question #8 prior to the force applied by the person. A. 1 B. 2 C. 3 D. 4 10:33
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