Physics 101: Lecture 13 Rotational Kinetic Energy and Rotational Inertia. Physics 101: Lecture 13, Pg 1

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1 Physics 0: Lecture 3 Rotational Kinetic Energy and Rotational Inertia Physics 0: Lecture 3, Pg

2 Overview of Semester Newton s Laws F Net = m a Work-Energy F Net = m a W Net = DKE multiply both sides by d Energy is conserved Useful when know Work done by forces Impulse-Momentum F Net = m a = Dp/Dt Impulse = Dp Momentum is conserved Works in each direction independently Physics 0: Lecture 3, Pg

3 Linear and Angular Motion Linear Angular Displacement x q Velocity v w Acceleration a a Inertia m I KE ½ m v Newton s nd F=ma Momentum p = mv Today! Physics 0: Lecture 3, Pg 3

4 Comment on axes and sign (i.e. what is positive and negative) Whenever we talk about rotation, it is implied that there is a rotation axis. This is usually called the z axis (we usually omit the z subscript for simplicity). Counter-clockwise (increasing q) is usually called positive. z +w Clockwise (decreasing q) is usually called negative. [demo] Physics 0: Lecture 3, Pg 4

5 Energy ACT/demo When the bucket reaches the bottom, its potential energy has decreased by an amount mgh. Where has this energy gone? A) Kinetic Energy of bucket B) Kinetic Energy of flywheel C) Both and. Physics 0: Lecture 3, Pg 5

6 Rotational Kinetic Energy Consider a mass M on the end of a string being spun around in a circle with radius r and angular frequency w [demo] Mass has speed v = w r Mass has kinetic energy» K = ½ M v» = ½ M w r» = ½ (M r ) w» = ½ I w M Rotational Kinetic Energy is energy due to circular motion of object. Physics 0: Lecture 3, Pg 6

7 Rotational Inertia I Tells how much work is required to get object spinning. Just like mass tells you how much work is required to get object moving. K tran = ½ m v Linear Motion K rot = ½ I w Rotational Motion I = S m i r i (units kg m ) Note! Rotational Inertia (or Moment of Inertia ) depends on what you are spinning about (basically the r i in the equation). Physics 0: Lecture 3, Pg 7

8 Rotational Inertia Table For objects with finite number of masses, use I = S m r. For continuous objects, use table below (p. 63 of book). Physics 0: Lecture 3, Pg 8

9 Merry Go Round Four kids (mass m) are riding on a (light) merry-go-round rotating with angular velocity w=3 rad/s. In case A the kids are near the center (r=.5 m), in case B they are near the edge (r=3 m). Compare the kinetic energy of the kids on the two rides. A B A) K A > K B B) K A = K B C) K A < K B Physics 0: Lecture 3, Pg 9

10 Inertia Rods Two batons have equal mass and length. Which will be easier to spin A) Mass on ends B) Same C) Mass in center Physics 0: Lecture 3, Pg 0

11 Checkpoint: Rolling Race (Hoop vs Cylinder) A solid and hollow cylinder of equal mass roll down a ramp with height h. Which has greatest KE at bottom? A) Solid B) Hollow C) Same Physics 0: Lecture 3, Pg

12 Prelecture: Rolling Race (Hoop vs Cylinder) A solid and hollow cylinder of equal mass roll down a ramp with height h. Which has greatest speed at the bottom of the ramp? A) Solid B) Hollow C) Same 50% 7% 33% Physics 0: Lecture 3, Pg

13 Main Ideas Rotating objects have kinetic energy KE = ½ I w Moment of Inertia I = S mr Depends on Mass Depends on axis of rotation Energy is conserved but need to include rotational energy too: K rot = ½ I w Physics 0: Lecture 3, Pg 3

14 Massless Pulley Example Consider the two masses connected by a pulley as shown. Use conservation of energy to calculate the speed of the blocks after m has dropped a distance h. Assume the pulley is massless. E K + U E U initial + Kinitial U final + K final m gh + mv + mv m gh m v + m v v E 0 f mgh m + m Note: Tension does positive work on and negative work on. Net work (on and ) by tension is ZERO. Physics 0: Lecture 3, Pg 4

15 Massive Pulley Act Consider the two masses connected by a pulley as shown. If the pulley is massive, after m drops a distance h, the blocks will be moving A) faster than B) the same speed as Slower because some energy goes C) slower than into spinning pulley! if it was a massless pulley U + K U + initial initial final K final 0 m gh + mv + mv + Iw m gh + m v + m v + m gh + mv + mv + MR v R v m mgh + m + M 4 Physics 0: Lecture 3, Pg 5 Mv /

16 Summary Rotational Kinetic Energy K rot = ½ I w Rotational Inertia I = S m i r i Energy Still Conserved! Physics 0: Lecture 3, Pg 6

Strike. Physics 101: Lecture 13 Rotational Motion, Kinetic Energy and Rotational Inertia. Page 1. Reminders:

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