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phys111_sep30_lecture.pdf

phys111_sep30_lecture.pdf - Work and energy along a curved...

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Work and energy along a curved path We can use the same expression for gravitational potential energy whether the body’s path is curved or straight. conservation of projectile energy: same speed at any given height h
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Clicker Question 7.2 Read Ahead! As a rock slides from A to B along the inside of this frictionless hemispherical bowl, mechanical energy is conserved. Why? (Ignore air resistance.) A. The bowl is hemispherical. B. The normal force is balanced by centrifugal force. C. The normal force is balanced by centripetal force. D. The normal force acts perpendicular to the bowl’s surface. E. The rock’s acceleration is perpendicular to the bowl’s surface.
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Clicker Question 7.2 Read Ahead! As a rock slides from A to B along the inside of this frictionless hemispherical bowl, mechanical energy is conserved. Why? (Ignore air resistance.) A. The bowl is hemispherical. B. The normal force is balanced by centrifugal force. C. The normal force is balanced by centripetal force. D. The normal force acts perpendicular to the bowl’s surface. E. The rock’s acceleration is perpendicular to the bowl’s surface.
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Clicker Question 7.3 Read Ahead!
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