Finding normal force acting on an object (Fn)?

  • Thread starter shamma
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  • #1
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1. A couch with a mass of 100 kg is placed on an adjustable ramp connected to a truck.If the couch slides down the ramp with an acceleration of 0.8 m/s^2:

2. find the normal force on the couch

3. my way:
Fg=m*9.81=981
Fnety=0N
981 sin 270+f sin 180+Fn sin 90=0N
-981Fn=0
Fn=981
my ans is wrong

hint:the ans shold be (Fn=959.6N)
 

Answers and Replies

  • #2
rude man
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Hmm - I get Fn = ma*cot[arc sin(a/g) = 977.73 N

Assumes frictionless plane
 
Last edited:

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