A simple pendulum comprised of a bob of mass m = 112 g and a lightweight string of length 76.0 cm is released from rest from an initial angle of 20.0° from the vertical. (a) Using the approach of simple harmonic motion, what is the maximum speed of the pendulum bob? m/s (b) Using the approach of simple harmonic motion, what is the maximum angular acceleration of the bob? rad/s? (c) How does the speed found in part (a) compare with that found by using a conservation of energy approach? (Assume that the values are nearly the same if withir 10% of each other.) O The speed is very different from that from part (a). O The speed is nearly the same as that from part (a).

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Rigid Body

A rigid body is an object which does not change its shape or undergo any significant deformation due to an external force or movement. Mathematically speaking, the distance between any two points inside the body doesn't change in any situation.

Rigid Body Dynamics

Rigid bodies are defined as inelastic shapes with negligible deformation, giving them an unchanging center of mass. It is also generally assumed that the mass of a rigid body is uniformly distributed. This property of rigid bodies comes in handy when we deal with concepts like momentum, angular momentum, force and torque. The study of these properties – viz., force, torque, momentum, and angular momentum – of a rigid body, is collectively known as rigid body dynamics (RBD).