PHY183-Lecture09 - 1 Physics for Scientists &...

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Unformatted text preview: 1 Physics for Scientists & Physics for Scientists & Engineers 1 Engineers 1 Physics for Scientists & Physics for Scientists & Engineers 1 Engineers 1 February 1, 2011 Physics for Scientists&Engineers 1 1 Spring Semester 2011 Lecture 9 Force 2 Clicker Quiz Clicker Quiz Clicker Quiz Clicker Quiz s Chapter 4 discusses which equation A . E = m c 2 B . F = m a C . p V = n R T D . p = m v E . K = (1/2) m v 2 February 1, 2011 Physics for Scientists&Engineers 1 2 3 Forces and Dynamics Forces and Dynamics Forces and Dynamics Forces and Dynamics s Forces that act on objects and Newtons Laws February 1, 2011 Physics for Scientists&Engineers 1 3 4 Types of Forces Types of Forces Types of Forces Types of Forces s Contact force Tension Compression Normal force (perpendicular) Friction force pring force s Spring force A force is needed to stretch or compress a spring Has the special property that it depends linearly on the change in length of the spring February 1, 2011 Physics for Scientists&Engineers 1 4 5 Fundamental Forces Fundamental Forces Fundamental Forces Fundamental Forces s All the forces on the previous slide are manifestations of the four fundamental forces Gravitational force When you hold an object in the air and release it, it falls to the ground Electromagnetic force Repulsion of like electric charges Attraction of opposite magnetic poles Strong nuclear force Holds atomic nuclei together Weak nuclear force Responsible for the decay the neutron February 1, 2011 Physics for Scientists&Engineers 1 5 Don't affect our everyday lives 6 Ways to Use Forces Ways to Use Forces Ways to Use Forces Ways to Use Forces February 1, 2011 Physics for Scientists&Engineers 1 6 7 Gravitational Force Vector Gravitational Force Vector Gravitational Force Vector Gravitational Force Vector s Forces have a direction s If you hold a laptop in your hand, you can tell that the ravitational gravitational force points downward (- y direction) February 1, 2011 Physics for Scientists&Engineers 1 7 = - = a g g g F F y F m g 8 Weight and Mass Weight and Mass Weight and Mass Weight and Mass s Magnitude of gravitational force on an object = weight s Gravitational force on an object, F g , is always proportional to its mass s Near surface of Earth (altitude of 10 km or less): eight is constant and is the product of objects February 1, 2011 Physics for Scientists&Engineers 1 8 Weight is constant and is the product of objects mass and the Earths gravitational acceleration: F g = mg g = 9.81 m/s 2 9 s Example: Object with mass m = 5.00 kg Gravitational force F g = mg = (5.00 kg)(9.81 m/s 2 ) = 49.05 kg m/s 2 s Force Unit 1 kg m/s 2 = 1 N Weight and Mass Weight and Mass Weight and Mass Weight and Mass...
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PHY183-Lecture09 - 1 Physics for Scientists &...

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