A block of mass m = 2.0 kg is pushed a distance d = 4.0 m along a friction surface with coefficient of kinitik friction 0.20, horizontal table by a constant applied force of magnitude F = 25.0 N directed at an angle 0 = 20º below the horizontal as shown in Figure. Determine the work done on the block by: 1. The applied force. 2. The normal force exerted by the table. 3. The gravitational force. 4. The net force on the block. m d

For a force to be a conservative force, when applied to a single test body a. it must be parallel to a displacement in any direction. b. 7. it must have the same direction at all points in space. C. no work must be done for motion in closed paths. d. it must have the same value at all points in space. equal work must be done in equal displacements.

A cable “lowers” a 3000 kg elevator at a constant velocity for a distance of 35.0 m What is the work done by a) the tension in the cable and b) gravity ?

The horizontal component of a force acts on a box moving to the right according to the plot shown. What is the total work done by the force during the duration of the motion assuming that it moves from x = 0 to x= 120 [m]? FIN) 10 (m) 4 Oa +120 (J) Ob. 160 [J] OG -120 [J] O d. -60 [J]

1. A 500 – N box is pushed across a horizontal floor with a force of 250 N. The coefficient of kinetic friction is 0.40. (a) Find the work done in pushing the box 20 m. (b) How much work went into overcoming friction and how much into accelerating the box?

4. A force of F= 20 N at an angle of 37° is applied to a 3-kg object initially at rest. The object has displaced a distance of 25 m over a frictionless horizontal table. Determine the work done by the applied force.

4 A cable exerts a constant upward tension of magnitude 1.38 x 10" N on a 1.20 x 10 kg elevator as it rises through a vertical distance of 3.50 m. HINT (a) Find the work done by the tension force on the elevator (in J). (b) Find the work done by the force of gravity on the elevator (in J).

1. A force of F = 5.6 Ni + 9.7 Nj + 7.9 Nk is applied to a particle in space to move it at a distance r = 2.6mi - 5.8mj - 9.7mk . Determine the work done by force.

A horizontal force of 150 N is applied to push a 40.0 kg box a distance 6.00 m on a rough horizontal surface. If the box moves quickly constant, determine: A. The work that reverses the 150 N force. B. The coefficient of kinetic friction between the box and the surface.

1. A tractor is hitched to a sled loaded with firewood as shown. The total weight of the sled and load is 14700 N. The tractor exerts a constant force F, with magnitude 5000N at an angle of o = 36.9° above the horizontal. A constant 3500-N friction force opposes the motion. To drag the sled a distance of 20.0 m, a total of 10.0 kJ of work must be done on the sled. a. Draw the free body diagram of forces acting on the sled. b. What is the mass of the loaded sled? c. Suppose the sled's initial speed, vo, is 2.00 m/s. What is its final speed, vr,? 14 700N 34.9 a) Freo bady dlagram Fp-3500N 36-40 =14700N mg mg. M= 1470N 9.80mis m=1.5x10 ng 2. You throw a 10.0 N rock into the air from ground level and observe that, when it is 14.0 m high, it is traveling upward at 25.0 m/s.