If an object is moved a distance d compared to something it is rubbing against with a kinetic friction fk, what change will there be, if any, in its kinetic plus potential energy?  Options:  a) It doesn't change it  b) It will be reduced by fkd  c) it can be increased or decreased by fkd, depending on which way it is going  d) It will be increased by fkd

QUESTION 8 Consider the four possible paths of a body moving through gravity as diagrammed below. Which of the following statements is true? Projectile A a. The work done by gravity is greatest for path B. b. The work done by gravity is greatest for path C. c. The work done by gravity is greatest for path D. d. The work done by gravity is the same for all four paths. e. The work done by gravity is greatest for path A.

A 34.5-kg child is on a swing attached to ropes that are L = 1.29 m long. Take the zero of the gravitational potential energy to be at the position of the child when the ropes are horizontal. a) Determine the child's gravitational potential energy when the child is at the lowest point of the circular trajectory. -436.6 J You are correct. Your receipt no. is 157-4178 ? Previous Tries b) Determine the child's gravitational potential energy when the ropes make an angle of 45.0° relative to the vertical. 312.84 J Submit Answer Incorrect. Tries 7/99 Previous Tries

1-An object of mass m=2kg which is initially at rest is pushed upward by a horizontal force F= soN along the incline surface as shown in the figure. The coefficient of friction between the mass and the surface is  =O.5. The block traveled a distance =10m along the incline under the action of F.  Determine a) Work done by the horizontal force b) Work done by the friction force c) Work done by the gravitational force d) Work done by the normal force e The acceleration of the mass f The velocity of the block after it traveled the distance d (g= 10 m/s°, = 37 °  COS37° = 0.8, sin37° = 0.6)