a) A delivery truck with two stacked crates in the back brakes quickly. The crate on the bottom just barely stays put on the floor of the truck. Does the top crate stay put or does it fall off? The top crate has a mass of 27.0 kg and the mass of the bottom crate is 22.0 kg. The coefficient of static friction between the bottom crate and the truck is 0.420, and the coefficient of kinetic friction for that surface is 0.350. The coefficient of static friction between the crates is 0.400, and the coefficient of kinetic friction is 0.320. Hint: Don’t forget about Newton’s 3rd Law especially when dealing with friction between the two crates b) The top crate will slide off if it moves more than 87.5 cm. If the truck braked for 1.84 s did the top crate slide off? If not, how far did it move?

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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?”