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Dynamics Chapter 4

Dynamics Chapter 4 . Force Section 4.1. Forces are Pushes or Pulls. Forces are Vector Quantities. Forces Always Come in Pairs. Perpendicular Forces are Zero. Units of Forces. Pull. Pull. Class Activity: Follow up. Distribute spring scale balances to class

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Dynamics Chapter 4

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  1. DynamicsChapter 4 Force Section 4.1

  2. Forces are Pushes or Pulls Forces are Vector Quantities Forces Always Come in Pairs Perpendicular Forces are Zero

  3. Units of Forces

  4. Pull Pull

  5. Class Activity: Follow up Distribute spring scale balances to class Distribute wooden blocks to class Attach the wooden block to your spring scale Pull the wooden block slowly across your desk with constant speed Record the reading on your spring scale in the data section of this Lab Lesson Follow Up Repeat Procedures #4 and #5 two more times Determine the average value of those readings If your spring scale gives you a reading that is in Newtons, convert that unit to pounds (lbs) and cgs. If your spring scale gives you a reading that is in pounds (lbs), convert that unit to Newtons (N) and Dynes (cgs).

  6. Activity Question I 1) A Gravitational Force to gravity 2) A Friction Force 3) A Pulling Force 4) No Force was applied A s you pulled on your spring scale, the block of wood moved. What is Force caused this motion? The block moved due to a Pulling Force applied by your hand. Homework:What other forces do you think were acting on your block? Write the names of them down.

  7. In Your Experience 1) a net force acted on it 2) no net force acted on it 3) it remained at rest 4) it did not move, but only seemed to 5) gravity briefly stopped acting on it You put your book on a bus seat next to you. When the bus stops suddenly, the book slides forward off the seat. Why? The book was initially moving forward (since it was on a moving bus). When the bus stopped, the book continued moving forward, which was its initial state of motion, and therefore it slid forward off the seat. Follow-up:What is the force that usually keeps the book on the seat?

  8. In Your Experience 1) the force pushing the stone forward finally stopped pushing on it 2) no net force acted on the stone 3) a net force acted on it all along 4) the stone simply “ran out of steam” 5) the stone has a natural tendency to be at rest You kick a smooth flat stone out on a frozen pond. The stone slides, slows down, and eventually stops. You conclude that: After the stone was kicked, no force was pushing it along! However, there must have been some force acting on the stone to slow it down and stop it. This would be friction!! Follow-up:What would you have to do to keep the stone moving?

  9. Homework Posted on MyHomework Chapter 1 Read section 4.1 pages 72 to 73

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