L04b - 1 11 Physics 111 Lecture 4b “The test of a...

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Unformatted text preview: 1 / 11 Physics 111 Lecture 4b “The test of a first-rate intelligence is the ability to hold two opposed ideas in mind at the same time and still retain the ability to function.” –F. Scott Fitzgerald Solving problems using Newton’s Laws Examples Steps Tips Friction Static Max Static S to K Question Examples 2 / 11 ■ Example 1: Olivia is pulling a two-wagon train with a 100-N force. The wagons have a mass of 2 . 5 and 3 . 7 kg, and Olivia’s string forms a 30 o angle with the ground (a) What is the acceleration of the train? (b) What is the tension T of the string that links the two wagons? (c) If she starts from rest, how far does Olivia go after 15 s? ■ Example 2: Olivia is pushing a sled of mass m = 5 . kg up a snowy, frictionless incline that forms an angle θ = 10 o with the horizontal (see figure). The magnitude of Olivia’s push is F = 40 N. (a) What is the acceleration of the sled? (b) What is the normal force of the incline on the block? Solving problems using Newton’s Laws Examples Steps Tips Friction Static Max Static S to K Question Examples 3 / 11 ■ Example 3: An elevator of mass m = 850 kg has a counterweight of mass m 2 = 1000 kg (see figure). The elevator is carrying four passengers. The total mass of the elevator and the passengers is...
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L04b - 1 11 Physics 111 Lecture 4b “The test of a...

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