PHYS171_f11_lecture_27

# PHYS171_f11_lecture_27 - – potential energy converted to...

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PHYS171 Principles of Physics I Chapter 7 Work done by lifting an object subject to constant gravity F=mg Gravity is characterized by constant force. F y F y F y We assume the object is moving slowly, at constant velocity with no acceleration (except starting and stopping the motion). Applied force and gravity (mg) are in or extremely close to equilibrium throughout the motion. The applied force is always upward, whether the mass is moving up or moving down. h

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Chapter 7 Transformation of Energy Catapult Compress a spring chemical energy of muscles converted to potential energy of spring. Launch projectile
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Unformatted text preview: – potential energy converted to kinetic energy, projectile velocity. Flight of projectile – kinetic energy converted to gravitational potential energy. Landing of projectile – gravitational potential energy converted to kinetic energy again. Impact – kinetic energy converted to heat and damage to target . Chapter 7 Problem A train traveling 1m/s strikes a bumper consisting of a spring with constant 1000N/m. The train weighs 5000kg. •How far does the train compress the spring •What is the maximum acceleration experienced by the train?...
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PHYS171_f11_lecture_27 - – potential energy converted to...

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