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Physics 101: Chapter 5 Application of Newton's Laws

Physics 101: Chapter 5 Application of Newton's Laws. New Material: Textbook Chapter 5 Circular Motion & Centripetal Acceleration. Demo. You are twirling a ball on string. What happens if the string breaks ?. b. c. a. v. Answer: b.  v. v 1. v 2. v 2. R. v 1.  R.

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Physics 101: Chapter 5 Application of Newton's Laws

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  1. Physics 101: Chapter 5Application of Newton's Laws • New Material: Textbook Chapter 5 • Circular Motion & Centripetal Acceleration Demo

  2. You are twirling a ball on string.What happens if the string breaks ? b c a v Answer: b

  3. v v1 v2 v2 R v1 R centripetal acceleration Acceleration in Uniform Circular Motion aave= Dv / Dt

  4. centripetal acceleration Uniform Circular Motion(circular motion with constant speed) R v a • Instantaneous velocity is tangent to circle • Instantaneous acceleration is radially inward • There must be a force to provide the acceleration

  5. FN correct f W Chapter 5, Pre-Flight Questions Consider the following situation: You are driving a car with constant speed around a horizontal circular track. On a piece of paper, draw a Free Body Diagram (FBD) for the car. How many forces are acting on the car?1 2 3 4 5

  6. correct R a=v2/R SF = ma = mv2/R Chapter 5, Pre-Flight Question FN The net force on the car is1. Zero 2. Pointing radially inward 3. Pointing radially outward f W For the car to stay traveling around a horizontal circular track, there must be a net force pointing radially inward, toward the center of the circle. If there wasn't, the car would drive in a straight line.

  7. More about Centripetal Acceleration Define frequency f, period T, angular velocity w:

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