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Dynamics_Hibbeler_CH18_1and4

# Dynamics_Hibbeler_CH18_1and4 - Todays Objectives Students...

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KINETIC ENERGY, WORK, PRINCIPLE OF WORK AND ENERGY Today’s Objectives : Students will be able to: 1. Define the various ways a force and couple do work. 2. Apply the principle of work and energy to a rigid body. In-Class Activities : Check Homework Reading Quiz Applications Kinetic Energy Work of a Force or Couple Principle of Work and Energy Concept Quiz Group Problem Solving Attention Quiz

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READING QUIZ 1. Kinetic energy due to rotation of the body is defined as A) (1/2) m (v G ) 2 . B) (1/2) m (v G ) 2 + (1/2) I G ϖ 2 . C) (1/2) I G ϖ 2 . D) I G ϖ 2 . 2. When calculating work done by forces, the work of an internal force does not have to be considered because ____________. A) internal forces do not exist B) the forces act in equal but opposite collinear pairs C) the body is at rest initially D) the body can deform
APPLICATIONS If the motor gear characteristics are known, how would you find the rotational velocity of the mixing drum? The work of the torque (or moment) developed by the driving gears on the two motors on the concrete mixer is transformed into the rotational kinetic energy of the mixing drum.

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APPLICATIONS (continued) Are the kinetic energies of the frame and the roller related to each other? If so, how? The work done by the soil compactor's engine is transformed into the translational kinetic energy of the frame and the translational and rotational kinetic energy of the roller and wheels (excluding the internal kinetic energy developed by the moving parts of the engine and drive train).
KINETIC ENERGY (Section 18.1) The kinetic energy of a rigid body can be expressed as the sum of its translational and rotational kinetic energies.

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