Chapter 9. Rotational Dynamics
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1 Chapter 9 Rotational Dynamics
2 9.1 The Action of Forces and Torques on Rigid Objects In pure translational motion, all points on an object travel on parallel paths. The most general motion is a combination of translation and rotation.
3 9.1 The Action of Forces and Torques on Rigid Objects According to Newton s second law, a net force causes an object to have an acceleration. What causes an object to have an angular acceleration?
4 9.1 The Action of Forces and Torques on Rigid Objects According to Newton s second law, a net force causes an object to have an acceleration. What causes an object to have an angular acceleration? TORQUE
5 9.1 The Action of Forces and Torques on Rigid Objects The amount of torque depends on where and in what direction the force is applied, as well as the location of the axis of rotation.
6 9.1 The Action of Forces and Torques on Rigid Objects DEFINITION OF TORQUE Magnitude of Torque = (Magnitude of the force) x (Lever arm) τ = F Lever arm, l is minimum distance between line of action and axis of rotation. Direction: The torque is positive when the force tends to produce a counterclockwise rotation about the axis. SI Unit of Torque: newton x meter (N m)
7 9.1 The Action of Forces and Torques on Rigid Objects Example The Achilles Tendon The tendon exerts a force of magnitude 790 N. Determine the torque (magnitude and direction) of this force about the ankle joint.
8 9. Rigid Objects in Equilibrium If a rigid body is in equilibrium, neither its linear motion nor its rotational motion changes. a a = 0 α = 0 x = y x F = 0 Fy = 0 τ = 0
9 9. Rigid Objects in Equilibrium Reasoning Strategy 1. Select the object to which the equations for equilibrium are to be applied.. Draw a free-body diagram that shows all of the external forces acting on the object. 3. Choose a convenient set of x, y axes and resolve all forces into components that lie along these axes. 4. Apply the equations that specify the balance of forces at equilibrium. (Set the net force in the x and y directions equal to zero.) 5. Select a convenient axis of rotation. Set the sum of the torques about this axis equal to zero. 6. Solve the equations for the desired unknown quantities.
10 9. Rigid Objects in Equilibrium Example 3 A Diving Board A woman whose weight is 530 N is poised at the right end of a diving board with length 3.90 m. The board has negligible weight and is supported by a fulcrum 1.40 m away from the left end. Find the forces that the bolt and the fulcrum exert on the board. τ = 0 FF l wwl ww = N
11 9. Rigid Objects in Equilibrium Example 5 Bodybuilding The arm is horizontal and weighs 31.0 N. The deltoid muscle can supply 1840 N of force. What is the weight of the heaviest dumbbell he can hold?
12 9.3 Center of Gravity DEFINITION OF CENTER OF GRAVITY The center of gravity of a rigid body is the point at which its weight can be considered to act when the torque due to the weight is being calculated.
13 9.3 Center of Gravity When an object has a symmetrical shape and its weight is distributed uniformly, the center of gravity lies at its geometrical center.
14 9.3 Center of Gravity x cg = W1 x W Wx + + W +
15 9.3 Center of Gravity Example 6 The Center of Gravity of an Arm The horizontal arm is composed of three parts: the upper arm (17 N), the lower arm (11 N), and the hand (4. N). Find the center of gravity of the arm relative to the shoulder joint m
16 9.3 Center of Gravity Conceptual Example 7 Overloading a Cargo Plane This accident occurred because the plane was overloaded toward the rear. How did a shift in the center of gravity of the plane cause the accident?
17 9.3 Center of Gravity Finding the center of gravity of an irregular shape.
18 9.4 Newton s Second Law for Rotational Motion About a Fixed Axis F = ma T T τ = F T r a T = rα τ = ( mr )α Moment of Inertia, I
19 9.4 Newton s Second Law for Rotational Motion About a Fixed Axis τ 1 = ( m r ) 1 1 α = ( τ mr )α τ = ( m r ) α Net external torque Moment of inertia τ N = ( m r )α N N
20 9.4 Newton s Second Law for Rotational Motion About a Fixed Axis ROTATIONAL ANALOG OF NEWTON S SECOND LAW FOR A RIGID BODY ROTATING ABOUT A FIXED AXIS Net external torque Moment of = inertia Angular acceleration τ = I α Requirement: Angular acceleration must be expressed in radians/s. Units of I? kkkk mm I = ( mr )
21 9.4 Newton s Second Law for Rotational Motion About a Fixed Axis Example 9 The Moment of Inertia Depends on Where the Axis Is. Two particles each have mass m and are fixed at the ends of a thin rigid rod. The length of the rod is L. Find the moment of inertia when this object rotates relative to an axis that is perpendicular to the rod at (a) one end and (b) the center. (a) II = mm rr (b) II = mm 1 rr 1 + mm rr
22 9.4 Newton s Second Law for Rotational Motion About a Fixed Axis Table 9.1 Moment of Inertia for various Rigid objects
23 9.5 Rotational Work and Energy s = rθ W = Fs = Frθ τ = Fr W =τθ
24 9.5 Rotational Work and Energy DEFINITION OF ROTATIONAL WORK The rotational work done by a constant torque in turning an object through an angle is W R =τθ Requirement: The angle must be expressed in radians. SI Unit of Rotational Work? N.m = joule (J)
25 9.5 Rotational Work and Energy KE = mvt = mr 1 1 ω v T = rω ( 1 ) ( ) 1 1 ω mr ω = mr ω I = KE =
26 9.5 Rotational Work and Energy DEFINITION OF ROTATIONAL KINETIC ENERGY The rotational kinetic energy of a rigid rotating object is KE R = I 1 ω Requirement: The angular speed must be expressed in rad/s. SI Unit of Rotational Kinetic Energy: joule (J)
27 9.5 Rotational Work and Energy Total mechanical Energy is equal to sum of translational kinetic energy, rotational kinetic energy, and gravitational energy E = KE T + KE R +PE 1 1 E = mv + Iω + mgh
28 9.6 Angular Momentum DEFINITION OF ANGULAR MOMENTUM The angular momentum L of a body rotating about a fixed axis is the product of the body s moment of inertia and its angular velocity with respect to that axis: L = Iω pp = mmvv Requirement: The angular speed must be expressed in rad/s. SI Unit of Angular Momentum? kg m /s
29 9.6 Angular Momentum PRINCIPLE OF CONSERVATION OFANGULAR MOMENTUM The angular momentum of a system remains constant (is conserved) if the net external torque acting on the system is zero.
30 9.6 Angular Momentum Conceptual Example 14 A Spinning Skater An ice skater is spinning with both arms and a leg outstretched. She pulls her arms and leg inward and her spinning motion changes dramatically. Use the principle of conservation of angular momentum to explain how and why her spinning motion changes. Remains same Decreases Increases
31 For Practice Ch 9 FOC Questions: 1, 3, 6, 10, 16 and 17. Problems: 5, 10, 1, 31, 34, and 48
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