The truck’s winch exerts a horizontal force on the 200-kg crate in an effort to pull it do...

The truck’s winch exerts a horizontal force on the 200-kg crate in an effort to pull it down the ramp. The coefficient of static friction between the crate and the ramp is μs = 0.6.

(a) If the winch exerts a 200-N horizontal force on the crate, what is the magnitude of the friction force exerted on the crate by the ramp?

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(b) What is the magnitude of the horizontal force the winch must exert on the crate to cause it to start moving down the ramp?