Which of the following statements is not one of Newton’s Laws on motion? a. In the absence of an unbalanced force, an object moves at constant velocity b. For any force there is always an equal but opposite reaction force. c. The force and the acceleration of a body are towards the same direction.

True or False, write T if the statement is true and write F if the statement is False. This is all about General Physics 1: Newton's Laws of Motion.

24. A pickup truck with mass 980 kg is initially at rest. The truck accelerates to a speed of 95 km/hr within a distance of 60 meters. What the direction and size of the force that acts on the truck? a. b. If the truck were carrying a load of 200 kg, what new force would be required to achieve the same acceleration?

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.

46. If a constant, nonzero force is applied to an object, what can you say about the velocity and acceleration of the object? A. Velocity is constant; acceleration varies B. Velocity varies; acceleration constant C. Velocity is constant; acceleration constant D. Velocity varies; acceleration varies 47. Static friction VARIES from zero to its maximum value. A. True B. False   48. The normal force is ALWAYS ___ to the surface. A. Parallel B. Perpendicular C. Neither

2.  A chain consists of identical links, each with a mass of 2.5 kg. You grab the top link and hold the chain at rest so that it hangs vertically.    a)  Draw a free body diagram of the bottom three links (labeled 1, 2, 3). Label all forces and use double subscript notation to denote which object exerts the force and which object is experiencing the force.   b)  Find the magnitude of the force exerted on link 1 by link 2, in Newtons.   c)  Find the magnitude of the force exerted on link 2 by link 3, in Newtons.

18. According to Newton's third law, every force is accompanied by an equal and opposite reaction force. The reason that these forces do not cancel each other is a. the action force acts for a longer time period b. the two forces are not always in the same direction c. one of the two forces is greater than the other d. the two forces act upon different objects; only forces on the same object can balance each other. e. . nonsense! They do cancel each other. Objects accelerate because of the presence of a third force Justify your answer:

Commercial airplanes are sometimes pulled out of the passenger loading area by a tractor. a) An 1800 kg tractor exerts a force of 1.75 × 104 N backward on the pavement, and the system experiences forces resisting motion that totals 2400 N. If the acceleration is 0.14 m/s2, what is the mass of the airplane in kilograms?  b)