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Announcements

Announcements. Homework for tomorrow… (Ch. 3, Problems 20 & 46) 3.18: a) a = 0.97 m/s 2 b ) T 1 =11.6 N c ) ) T 2 = 34.9 N 3.24: v 2y = 182.6 m/s 3.30: v 2y = 22.0 m/s 1 st Exam on Tuesday, 9/13!! Office hours… M 3-4 pm TWR 9-10 am

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Announcements

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  1. Announcements • Homework for tomorrow… (Ch. 3, Problems 20 & 46) 3.18: a) a = 0.97 m/s2 b) T1 =11.6 N c) ) T2 = 34.9 N 3.24: v2y = 182.6 m/s 3.30: v2y = 22.0 m/s • 1st Exam on Tuesday, 9/13!! • Office hours… M 3-4 pm TWR 9-10 am F 1-2 pm • Tutorial Learning Center – Houston Hall 113 MWR 8 am-6 pm T 8 am-7 pm F 8 am-5 pm

  2. Chapter 3 Forces & Motion Along a Line (Questions & Problems)

  3. Last time… Newton’s 3 Laws: 1. If then 2. 3. 1D Free FallEqns for constant gravitational acceleration

  4. Prob 3.48 :Parachuting Two An 80 kg person is parachuting and experiencing a downward acceleration of 2.5 m/s2. The mass of the parachute is 5.0 kg. • What is the upward force on the open parachute from the air? • What is the downward force on the parachute from the person?

  5. Quiz Question 1 A large truck collides head-on with a small compact car. During the collision, the truck exerts • a greater amount of force on the car than • a smaller amount of force on the car than • the same amount of force on the car as the car exerts on the truck.

  6. Quiz Question 2 A large truck collides head-on with a small compact car. During the collision, the truck has • a larger acceleration than the car. • a smaller acceleration than the car. • the same acceleration as the car.

  7. Prob 3.49 :Getting Down An 85 kg man lowers himself to the ground from a height of 10.0 m by holding onto a rope that runs over a frictionless pulley to a 65 kg sandbag. With what speed does the man hit the ground if he started from rest?

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