Momo with mass m is sliding down an inclined plane that makes an angle Φ relative to the horizontal. The coefficient of kinetic friction between Momo and the inclined plane is μk. Obtain an expression for Momo's acceleration along the incline. Assign a rotated Cartesian plane so that the acceleration is along the positive x-axis and the normal force is along the positive y-axis.     The component of the weight parallel to Momo's acceleration is wx = mg _____phi   The magnitude of the frictional force is f = μk ______   The normal force on Momo is n = mg_____phi   With these expressions and applying Newton's second law, we arrive at an expression for Momo's acceleration:   a= _____(_____  - μk______)

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”