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When you swing the pen, it will experience rotational motion due to the force applied to it. The pen will follow a curved path and its motion will depend on the speed and angle at which it is swung. Ultimately, the pen will continue moving in a circular motion until the force is removed.
The force that makes the back-and-forth motion of a swing higher is the force of gravity as the swing moves downward, converting potential energy at the highest point into kinetic energy as it swings lower. Pushing off the ground at the bottom of the swing arc also adds kinetic energy to the system, increasing the height of the swing.
The primary force in a swing set is gravity, which acts to pull the swing downward. The tension force in the chains or ropes of the swing set counteracts gravity and allows the swing to move back and forth. The force applied by the person on the swing also contributes to its motion.
The force of gravity makes a swing work. By leaning your body forward and backward as the swing passes the opposite direction, you cause the Center of Gravity (CG) to move slightly back from the center or slightly forward from the center. By doing this as momentum builds up, you can actually increase your swing arc. The length of the arc has an effect on the ability of the swinger to alter the CG. As the radius of the arc increases, so does the need for the offset of the lean to grow from the center of the arc as it would hang from dead center.
The force of inertia keeps water in a bucket when you swing it.
A child sitting on a swing is an example of a balanced force. The force of gravity pulling down on the child is balanced by the tension in the swing's ropes pulling up.
Gravitation and the muscle power of the swinger. After the initial start you can swing for a while only base don gravitation, but the swinging will go slower and slower until it stops. So your own power is needed as well.
The force that keeps a swing swinging is primarily gravity. The swinging motion is a result of the interplay between gravity pulling the swing downward and the tension in the chains or ropes supporting the swing.
Force of tension, exerted from the swing rope, keeps the swing moving in the horizontal back and forth motion. The force of gravity keeps the swing from staying at the far right or far left because it always wants the swing to be pulled to Earth, but the force of tension wants to keep it up. Air resistance, like friction, eventually slows the swing down to a halt.
Yes, a porch swing hanging from the porch roof is an example of a balanced force. The force of gravity acting on the swing is balanced by the tension in the ropes or chains that are supporting it.
When a child is being pushed on a swing, it is an example of an unbalanced force. The force provided by the push helps to overcome the force of gravity to keep the child swinging.