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Chapter 7 Rotational Motion and the Law of Gravity

Chapter 7 Rotational Motion and the Law of Gravity. Angular Acceleration & Angular Kinematics HMH Physics Ch 7 pages 224-269 Section 2 pages 226-231. Define Angular Acceleration. Calculate Angular Acceleration. Solve circular motion problems using Angular Kinematic equations.

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Chapter 7 Rotational Motion and the Law of Gravity

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  1. Chapter 7Rotational Motion and the Law of Gravity Angular Acceleration & Angular Kinematics HMH Physics Ch 7 pages 224-269 Section 2 pages 226-231

  2. Define Angular Acceleration. • Calculate Angular Acceleration. • Solve circular motion problems using Angular Kinematic equations. • Relate angular motion to linear motion.

  3. Angular Acceleration • Occurs when angular speed changes angular velocity rad t change of time s2  = f - i t = tf - ti ave = ave =

  4. A car’s tire rotates at an initial angular speed of 21.5 rad/s. The driver accelerates and after 3.5 s the tire’s angular speed is 28.0 rad/s. What is the tire’s average angular acceleration during the 3.5 s time interval?

  5. What is the average angular acceleration of a ferris wheel that starts out at 0.50 rad/s then speeds up to 0.60 rad/s in 0.50 s?

  6. Kinematic equations for constant angular acceleration Angular Linear or Tangential • f=i+Δt vf=vi+aΔt • Δθ = iΔt + ½(Δt)2 Δx = viΔt + ½a(Δt)2 • f2= i2 + 2Δθvf2 = vi2 + 2aΔx • Δθ = ½(I + f)Δt Δx = ½(vI + vf)Δt

  7. The wheel on an upside-down bicycle moves through 11.0 rad in 2.0 s. What is the wheel’s angular acceleration if its initial speed is 2.0 rad/s?

  8. A wheel accelerates with an angular acceleration of 22.4 rad/s2. If the wheel begins with an angular speed of 10.8 rad/s, what is the wheel’s angular speed after 3 full turns?

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