Class 11 - Dynamics: Newtons Second Law Physics 1301, Fall...

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1 Dynamics: Newton’s Second Law Physics 1301, Fall 2011: Class 11 Tuesday, September 27, 2011
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2 Objectives: Tuesday, September 27 Newton’s Second Law: Relationship between force and acceleration Problems applying Newton’s Second Law
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3 Demonstrations 1f20.14 Toilet paper inertia 1f20.20 Smash your hand 1f20.22 Hit the nail on the head 1f20.30 Tablecloth pull
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Examples of Forces Friction is a force that always opposes motion The direction of the frictional force is usually parallel to the sliding surface and against the direction of the motion The magnitude of the frictional force usually depends on the composition of the sliding surfaces and the magnitude of the normal force Friction is different when the two surfaces are static (not moving), kinetic (moving) and rolling 4
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Historic gpa Trends 5
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Examples of Forces Friction is mostly independent of contact area and the exact magnitude of the velocity. 6 F = μN μ s , μ k , μ r
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Other Forces Drag: air resistance (velocity dependent) Thrust: for example, by a rocket Electric: attractive or repulsive, depending on charge polarity Magnetic: attractive or repulsive, depending on currents 7
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Class 11 - Dynamics: Newtons Second Law Physics 1301, Fall...

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