Suppose you are hitting a tennis ball with a racket. Which of the following statements is true? a. The force of the racket pushing the ball is greater than the force of the ball pushing the racket. b. The force of the ball pushing the racket is greater than the force of the racket pushing the ball. c. The force of the ball pushing the racket is the same as the force of the racket pushing the ball. d. The relationship between the force of the ball pushing the racket and the force of the racket pushing the ball depends on the weight of the racket and the speed of the ball

A person exerts a force of 120 NN on a rope that pulls a sled across a very smooth horizontal surface. The rope is oriented 37⁰0 above the horizontal. The sled has a total mass of 50 kgkg. The sled starts at rest and moves for 10 mm. Select all the quantities that can be determined using the given information. A. Determine the acceleration of the sled. B. Determine the normal force exerted by the surface on the sled. C. Determine the time taken for the sled to move 10 m. D. Determine the speed of the sled after moving for 10 m. F. Check all that apply. acceleration of the sled normal force exerted by the surface on the sled mass of the person time taken for the sled to move 10 mm speed of the sled after moving 10 mm

Three boxes in contact slide side-by-side on a smooth, friction-less, horizontal floor. Their masses are 5.0-kg, 3.0-kg, and 2.0-kg, with the 3.0-kg box in the center. A force of 50 N pushes on the 5.0-kg box, which pushes against the other two boxes.   A. Draw the free-body diagrams for each of the boxes. B. What magnitude force does the 3.0-kg box exert on the 5.0-kg box? C. What magnitude force does the 3.0-kg box exert on the 2.0-kg box?

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.]

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:

3. Am=12.0 kg object is placed on a bathroom scale in an elevator. a. Draw a free body diagram of the object. Label the forces. Determine the apparent weight (the weight that would show in the scale) of the object if. b. The elevator is at rest. c. The elevator is rising at a constant velocity. d. The elevator is accelerating upward at 1.5 m/s/s. m e. The elevator is accelerating downward at 1.5 m/s/s. f. The elevator is accelerating downward at 10 m/s/s.

8. An object is pulled across a rough horizontal surface with an applied force of 300 N [40o below the horizontal]. The applied force is slowly rotated down toward the horizontal, decreasing the 40o angle. What will happen to the force of friction acting on the object and the acceleration? a. Both increase.b. Both decrease.c. Friction decreases and acceleration increases.d. Friction increases and acceleration decreases.e. None of the above statements are accurate.

Newtons Third Law: In the figure provided, a 220. kg crate, to the right of the pulley, is released from rest and begins to fall to the ground. If the mass on the left is m = 55.0 kg, what is the magnitude of the tension of the rope attached to the 220. kg crate? Assume the rope and pulley are massless. 862 N 2.16×103 N 431 N 539 N