You are inside an elevator standing on a scale. You do not know anything about the motion of the elevator, it could be moving, not moving, accelerating or not accelerating. Which of these forces is guaranteed to always have the same magnitude as the force the earth exerts on you no matter what the elevator is doing? Choose all that apply. A. The force the elevator exerts on the scale B. The force you exert on the Earth C. The force you exert on the scale D. The force that the scale exerts on you

You hold a book at rest in your hand. What is the “reaction force” to the weight of the book? a)  The force of gravity from the book on the Earth. b)  The force of gravity from the book on your hand. c)  The normal force from you hand on the book. d)  The normal force from the book on your hand.

A ball is hanging from a bracket fixed to the wall of an elevator. The elevator is accelerating in the upward direction. What is the reaction force (required by the third law of motion) to the force of gravity on the ball? A. (a) The mass of the ball. B. (b) The gravitational pull of the ball on the earth. C. (c) The gravitational pull of the earth on the ball. D. (d) The tension force of the ball on the rope. E. (e) The tension force of the rope on the ball. F. (f) The tension force of the rope on the bracket. G. (g) The force acting on the elevator to accelerate it. H. (h) A force between the elevator and the bracket, acting on one or the other. I. (i) None of the above.

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

A person pushes a box with a small constant force to move the box along the floor at a constant speed in a straight-line path.  Which of the following statements is true?   a. The net force on the box is zero.   b. There are no other forces on the box  (besides the person’s push.)   c. The net force on the box must be greater than zero to keep the box moving.   d. The box has an acceleration that is not zero.   e. [Both (c) and (d) are true.]

A mass sits at rest on top of a table. Which two forces are interaction pair forces and thus are equal and opposite? A. the contact force on the mass due to the table and the force of gravity on the Earth due to the mass B. the force of gravity on the mass due to the Earth and the contact force on the mass due to the table C. the force of gravity on the mass due to the Earth and the force of gravity on the Earth due to the mass D. the force of gravity on the mass due to the Earth and the contact force on the table due to E. the mass

Apply Newton’s 2nd Law to this situation. To do that: 1. Identify the forces: a. Draw a diagram of the situation. b. Draw a force diagram of the object. c. Define/choose an appropriate coordinate axis and find the x and/or y components of each force on your force diagram.