The best statements that describe the movement of a bowling ball moving down a flat bowling lane at a constant speed are:
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Its movement shows Newton's first law of motion: This law states that an object in motion will stay in motion at a constant velocity unless acted upon by an unbalanced force.
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Its movement remains the same unless a force acts upon it: This reiterates Newton's first law, emphasizing that unless a force (like friction or a hit from another ball) acts on the bowling ball, its constant speed will remain unchanged.
The other statements do not accurately describe the scenario:
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Its movement is caused by unbalanced forces: This statement is incorrect because if the bowling ball is moving at a constant speed, the forces acting on it (like friction and the force applied from the bowler) are balanced.
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Its movement changes without force acting upon it: This is incorrect; a change in movement requires unbalanced forces to act upon it.
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Its movement shows Newton's third law of motion: This law pertains to action-reaction pairs and is not directly applicable to the constant motion of the ball in this context.
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Its movement shows Newton's second law of motion: This law relates to the acceleration of an object in response to an unbalanced force. Since the bowling ball is not accelerating (moving at constant speed), it does not illustrate this law.
Thus, the correct selections are the first and last statements.