How Can I Apply Newton's Second Law with Friction in Real-Life Problems?

AI Thread Summary
Understanding Newton's Second Law in the context of friction can be challenging, especially when applying it to real-life scenarios. The discussion highlights a specific problem involving a 15 kg lawnmower being pushed at a constant speed with a force of 90 N at a 30-degree angle. To solve for the horizontal frictional force and the normal force, it's noted that since the acceleration is zero, the forces must be balanced, implying that the frictional force equals the horizontal component of the applied force. The conversation suggests that knowledge of kinetic friction is essential for calculating the frictional force. Engaging in dedicated physics forums can provide additional resources and support for understanding these concepts.
gotmilk954
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ok, i need some serious help with Newtons second law. like i kind of understand it, but adding things like friction are giving me real problems. does anyone have any good resources or tips on how to understand/comprehend this?

and i have a prolem:

a man pushes a 15 kg lawnmower at constant speed with a force of 90 N directed along the handle, which is at an angle of 30 degrees to the horizontal. calucalte: (a) the horizontal frictional force on the mower, and (b) the normal force
on the mower.

well i know the acceleration is zero, but don't you need the kinetic friction to find the frictional force?
 
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