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phys124s11-l01

# phys124s11-l01 - Physi cs 124 Spr i ng 2011 Physics 124...

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1 Physi cs 124, Spr i ng 2011 Physics 124, Spring 2011: Things to do Bookmark class web pages: http://www.physics.rutgers.edu/ugrad/124 Check the schedule – especially exams for conflicts class policies – especially grading Mastering Physics: RU01750124S2011 At this point you do not need to register your PRS/iClicker unit

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2 Physi cs 124, Spr i ng 2011 Physics 123 Review Kinematics (constant force) Newton's Law: Energy / momentum: F = m a and F 1 on 2 =− F 2 on 1 K = 1 2 mv 2 and p = mv x = x 0 v 0 t 1 2 a t 2
3 Physi cs 124, Spr i ng 2011 Physics 123 Review Kinematics (constant force) Newton's Law: Energy / momentum: The most important thing I learned in Physics 123 was: a:Newton's Laws b:Energy / momentum conservation laws c:Physics mathematically describes the natural world d:Prof. Bartynski is a great lecturer e:Physics only works in the classroom, not in the real world f:Physics is hard and boring F = m a and F 1 on 2 =− F 2 on 1 K = 1 2 mv 2 and p = mv x = x 0 v 0 t 1 2 a t 2

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4 Physi cs 124, Spr i ng 2011 Chapter 10: Rotational Motion Kinematics Energy Torques Angular Momentum
5 Physi cs 124, Spr i ng 2011 Chapter 10: Rotational Motion Kinematics Rotational motion is the same math as linear motion, but the variables have different names – for example: x = x 0 v 0 t 1 2 a t 2 = 0  0 t 1 2 t 2 , , :angularposition,velocity, acceleration s = r Consider a small object moves in a line vs in a circle x v = r Recall C = 2 r

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6 Physi cs 124, Spr i ng 2011 Chapter 10: Rotational Motion Kinematics x = x 0 v 0 t 1 2 a t 2 = 0  0 t 1 2 t 2 p = m v E = 1 2 I 2 for pure rotation E = 1 2 mv 2 L = I F = m a = I L:angularmomentum :torque , , :angularposition,velocity, acceleration I:momentofinertia = r x F L = r x p v = r  = 1 r 2 rx v W = F d x W = ⋅ d
7 Physi cs 124, Spr i ng 2011 Rolling Motion Body rotates about center of mass as cm moves Examples: bicycle tire, bowling ball Common approximation: rolling without slipping v cm = R

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8 Physi cs 124, Spr i ng 2011 Rolling Motion – a physical approach Common approximation: rolling without slipping
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phys124s11-l01 - Physi cs 124 Spr i ng 2011 Physics 124...

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