ndicate whether the following statements concerning Newton’s Laws are true or false. (Select T-True, F-False. If the first is T and the rest F, enter TFFFF).A) If a single force acts on an object, the object accelerates. B) If an object isn’t moving, no external forces act on it.C) If an object is accelerating, a force is acting on it.D) An object’s velocity will only be in the direction of the net force exerted on it.E) It is impossible to have motion in the absence of a force.

Which of the following statements is incorrect? O Forces are vectors O An object in at rest will have no applied force at all on it. O An object accelerating in a certain direction will have a total force in the same direction. O An object at a constant velocity will have no net force on it. s

A 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 stop

Which of the following is true? a. Earth exerts a force due to gravity on your body, and your body exerts a smaller force on the Earth, because your mass is smaller than the mass of the Earth.  b. The Moon orbits the Earth because the Earth exerts a force on the Moon and the Moon exerts a force equal in magnitude and direction on the Earth.  c. A rocket taking off exerts a force on the Earth equal to the force the Earth exerts on the rocket.  d. An airplane cruising at a constant speed is not affected by gravity.