5/130 Given: The punch is operated by a simple harmonic motion of the pivoted section. The motion is measured to be θ=θosin 2πt. Find the velocity of the punch when t = 10 seconds if θo= π/12. Set up velocity equation(s). Let’s label some points on the punch (A and B). List the velocity equation for B.What do I know in this equation?Now back to the vBequation. Problem Type: Find:Given: Rigid Body Kinematics (doesn’t ask about forces)θ= θοsin 2πt Velocity of the punch and angular velocity of AB First Step? What do we know here? Reflection: This is more simple than the general case because θwas equal to zero. I we were working this entire problem from the beginning we would have used the acceleration equations, realized we did not know ϖAB, and then used the velocity equations to find it. Long process!!!Does the sign of the cross product make sense?ABReally only rB/A. How can we find vA
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