Consider a metal cart on an airtrack. Ignoring friction, which of the following

Question

Consider a metal cart on an airtrack. Ignoring friction, which of the following best explains when the cart would be at rest and when it would move on the airtrack? a) The cart is at rest when left alone because of the force of gravity. The cart maintains a constant velocity when pushed because of the lack of friction. b) The cart is at rest when left alone because, in the absence of a net force, it remains at rest. The cart maintains a constant motion when pushed because of the lack of friction. c)The cart is at rest when left alone because, in the absence of a net force, it remains at rest. After being pushed, the cart maintains uniform motion because in the absence of a net force an object in uniform motion maintains its state of motion. d) The cart is at rest when left alone because of the force of gravity. The cart maintains a constant motion when pushed because, in the absence of a net force, an object in motion remains in motion.

Explanation / Answer

c)The cart is at rest when left alone because, in the absence of a net force, it remains at rest. After being pushed, the cart maintains uniform motion because in the absence of a net force an object in uniform motion maintains its state of motion. Newton's 1st law of motion

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