(3) A stack of two crates is being lifted upwards by two cables, as shown in the figure below. The tension in each cable is 2270 N. You may assume that the masses of the cables are negligible compared to the masses of the crates. Do not use Newton's 3rd Law. (a) Using Newton's 2nd Law, calculate the force that the top crate exerts on the bottom crate and the force that the bottom crate exerts on the top crate. (answer: Fbottom-on-top = Ftop-on-bottom= 3062 N) (b) The maximum tension that each cable can handle without breaking is 3230 N. Calculate the maximum upward acceleration that the load can have without breaking the cables. (answer: 8.97 m/s²) 232 kg 112 kg

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Newton's Second Law

Newton’s laws of motion describe the relationship between the motion of an object and forces acting on it. Newton’s law of motion has two types as follows: