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Announcements

Announcements. Homework for tomorrow… (Ch. 3, Problems 17 & 21) 3.8: | F | = 6.8 x 10 3 N 1 st Exam: Tuesday, Sept. 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

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Announcements

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  1. Announcements • Homework for tomorrow… (Ch. 3, Problems 17 & 21) 3.8: |F| = 6.8 x 103 N • 1st Exam: Tuesday, Sept. 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 ( Newton’s 3rd Law )

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

  4. Quiz Question 1 A ball is thrown vertically upwards. What is true at the top of its trajectory? • It has a nonzero velocity and zero acceleration • It has zero velocity and zero acceleration • It has zero velocity and nonzero acceleration • It has nonzero velocity and nonzero acceleration • None of the above

  5. Quiz Question 2 If you drop an object in the absence of air resistance, it accelerates downward at 9.8 m/s2. If instead you throw it downward, its downward acceleration after release is • less than 9.8 m/s2 • 9.8 m/s2 • more than 9.8 m/s2

  6. Problem 1:Peak Altitude An object is thrown vertically upwards with a velocity of v1y. What is the maximum height reached?

  7. Prob2.16 Four Penguins Figure 3-35 shows four penguins that are being playfully pulled along very slippery (frictionless) ice by a curator. The masses of the three penguins and the tension in two of the cords are given. Find the penguin mass that is not given.

  8. Force of Gravity The magnitude of the gravitational force acting on an object of mass m near the Earth’s surface is called the weight of the object Weight: • is a force • special case of 2nd law • is not an inherent property of an object

  9. Section 3.10:Newton’s 3rd Law If 1 object is exerting a force on a 2nd object, then the 2nd object is also exerting a force back on the 1st object. The two forces have the same magnitude but act in opposite directions. Mathematically:

  10. Quiz Question 3 A young physics professor pushes a chair across the floor at a constant speed in a straight line. The magnitude of the force he exerts on the chair is _______ the force the chair exerts on him. • a little less than • a lot less than • a little more than • a lot more than • the same as

  11. Quiz Question 4 A young physics professor pushes a chair across the floor at increasing speed in a straight line. The magnitude of the force he exerts on the chair is _______ the force the chair exerts on him. • a little less than • a lot less than • a little more than • a lot more than • the same as

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