ME 3455 Lecture Notes - Lecture 9: Friction, Ballistic Pendulum
2 Feb 2018
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Crates a and b weigh 100 lb and 50 lb respectively. If they start from rest, determine their speed when t = 5s. Also, find the force exerted by crate a on crate b during the motion. The coefficient of kinetic friction between the crates and the ground is 0. 25. A tankcar has a mass of 20 mg and is freely rolling to the right with a speed of 0. 75 m/s. If it strikes the barrier, the spring in bumper b has a stiffness (a) k = infinite (bumper is rigid), and (b) k = 15 kn/m. The 20 kg crate is lifted by a force of f = (100 + 5t^2) n, where t is in seconds. Determine how high the crate has moved upward when t is equal to 3 seconds. A ballistic pendulum consists of a 4kg wooden block originally at rest, theta = 0 degrees.
