Presentation on theme: "Horizontal Spring-Block Oscillators"— Presentation transcript:
1Horizontal Spring-Block Oscillators A popular demonstration vehicle for simple harmonic motion is the spring block oscillator.
2Oscillations of a Spring Displacement is measured from the equilibrium point.Amplitude is the maximum displacement.A cycle is a full to-and-from motion.Period is the time required to complete one cycle.Frequency is the number of cycles completed per second.Figure Caption: Force on, and velocity of, a mass at different positions of its oscillation cycle on a frictionless surface.
3The block-spring system shown on the right forms a linear SHM oscillator. The spring constant of the spring, k, is related to the angular frequency, w, of the oscillator:
4Spring ProblemA 1.0 kg mass attached to one end of a spring completes one oscillation every 2.0 s. Find the spring constant.
5Do Now1. A block whose mass m is 5kg is fastened to a spring whose spring constant k is 2000 N/m (See figure below). The block is pulled a distance x = 8 cm from its equilibrium position at x = 0 on a frictionless surface and released from rest at t = 0 Determine the period of oscillation, the frequency, and the angular frequency for the block.
14Note: In a vertical motion, the spring is not in equilibrium at its unstrained length, but at the point where the hanging block is in equilibrium.
15The restoring force also leads to simple harmonic motion when the object is attached to a vertical spring, just as it does when the spring is horizontal. When the spring is vertical, however, the weight of the object causes the spring to stretch, and the motion occurs with respect to the equilibrium position of the object on the stretched spring .mg = kd0, which gives d0 = mg/k.