The motion of an object along a straight line is caused by forces acting on the object. According to Newton’s First Law of Motion, an object will remain at rest or move in a straight line with constant speed unless acted upon by a net external force.
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The motion of an object along a straight line is caused by the application of a force. When a force is applied to an object, it can change the object’s state of motion, causing it to accelerate or decelerate. The direction and magnitude of the applied force determine the direction and speed of the object’s motion.