Does swinging pendulum lose energy?

The pendulum loses energy to wind resistance, friction between the tube and the string, and internal friction within the bending string. The pendulum must be "started" by swinging it by hand before the driver can transfer energy into it.

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Thereof, can potential energy be destroyed?

Work is energy in motion. Hence, chemical potential energy remains true to the basic law: potential energy is converted to kinetic energy and never created or destroyed. Then, is potential always positive? For like charges, the potential energy is always positive, that is because we need to put energy in the system to bring like charges closer together.

People also ask why is the pendulum important?

It states that a body at rest, stays at rest and a body in motion stays in motion, unless acted on by an outside force. Pendulums provide proof of Newton's first law of motion. What keeps a pendulum swinging? The science behind the pendulum is explained through the forces of gravity and inertia. The Earth's gravity attracts the pendulum. This means that since the pendulum is now in motion, it keeps moving, unless there is a force that acts to make it stop. Gravity works on the pendulum while it is moving.

Keeping this in consideration, why do shorter pendulums swing faster?

where l is the length of string of the pendulum and g is the acceleration due to gravity. So, when l is shorter, the time period of the pendulum decreases which means it has higher frequency which implies that it swings faster. Which has greatest kinetic energy? Kinetic energy is proportional to the square of the speed (actually, velocity) of an object's motion. So kinetic energy is greatest when an object's speed is greatest - it's as simple as that.

Is tension in a pendulum constant?

Tension in a pendulum is always the force in the string "tugging" at the weight. F=ma does not need to be zero because the "a" includes the force to change the direction; the force on the moon is not zero even though the moon stays (about) the same velocity and distance from Earth.