A box slides down a frictionless ramp and then crosses a 10 cm length of rough patch. The 1.75 kg box is released from rest at a height of 0.688 m. The Rough Patch has a coefficient of kinetic friction of 0.640. What is the velocity of the box at the bottom of the ramp? V1 = ? What is the Friction Force when the box is crossing over the Rough Patch? fk = ? What is the acceleration of the box as it is crossing over the Rough Patch? a = ? What is the velocity of the box after it has finished crossing the Rough Patch? V2 = ? For what length of time was the box crossing over the Rough Patch? t = ?

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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?”