According to Newton's third law, when you walk across a floor, the force that propels you forward is a the force applied by your feet on the floor b. the force of friction of your feet on the floor c. the force of the floor applied against your feet d. exerted upward by the floor on your feet (i.e., the normal force)
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- An object following a straight- line path at constant speed A. has a net force acting upon it in the direction of motion B. has zero acceleration C. has no forces acting on it D. none of theseA freight train consists of an engine and several identical cars on a straight, level track. Which of the following statements are true? A. If the train is moving at constant speed, the engine must be pulling with a force greater than the train's weight. B. If the train is moving at constant speed, the engine's pull on the first car must exceed that car's backward pull on the engine. C. If the train is moving at constant speed, the engine's pull must be equal to the force of friction. D. If the train is coasting, its inertia makes it slow down and eventually stopWhich of the following statements about the force of friction are accurate? (Choose all that apply) The force of friction decreases as velocity increases. Increasing the surface area of an object will increase the force of friction. All objects have the same coefficient of friction with each other. The force of friction acts in the direction opposite of motion. The force of friction is determined, in part, by the magnitude of the normal force. Increasing the mass of an object will increase the force of friction.
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