A moving force that acts on a structure is typically referred to as a dynamic load. This could include forces caused by wind, seismic activity, machinery, or other external factors that can impact the stability and behavior of the structure.
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The force that keeps a ball moving in a circle is called centripetal force. This force acts towards the center of the circle and prevents the ball from moving in a straight line.
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A force that slows a moving object is called a deceleration force. This force acts in the opposite direction of the object's motion, causing it to slow down. It can be caused by factors such as friction, air resistance, or drag.
Friction is the force that acts against all moving objects, slowing them down. It is caused by the contact between the object and the surface it is moving on.