the image shows a pendulum in simple harmonic motion. the pendulum starts at a and swings to e. which labels…
the image shows a pendulum in simple harmonic motion. the pendulum starts at a and swings to e. which labels are correct? check all that apply. e: net force is zero. d: velocity is decreasing. acceleration is increasing. a: velocity is zero. c: acceleration is maximum. b: velocity is decreasing. net force is decreasing. e: velocity is maximum.
Answer
Explanation:
Step1: Analyze point A
At the extreme - end (A), the pendulum momentarily stops before changing direction. So, the velocity at A is zero.
Step2: Analyze point C
At the lowest - point (C), the pendulum has maximum velocity and zero acceleration because the net force is only the tension in the string (in the absence of air - resistance) and there is no component of gravitational force acting tangentially to the motion at this point.
Step3: Analyze point D
As the pendulum moves from C to D, it is moving against the component of gravitational force acting tangentially. So, the velocity is decreasing and the acceleration (due to the tangential component of gravity) is increasing.
Step4: Analyze point E
At the extreme - end (E), the velocity is zero. The net force is not zero as there is a component of gravitational force acting tangentially to bring the pendulum back towards the equilibrium position.
Step5: Analyze point B
As the pendulum moves from A to B towards the equilibrium position, the velocity is increasing and the net force (tangential component of gravitational force) is decreasing as it gets closer to the equilibrium position.
Answer:
A: Velocity is zero. D: Velocity is decreasing. Acceleration is increasing.