Describe a situation in which a force is exerted for a long time but does no work. Explain.

5). Which requires more work, pushing a 200 kg refrigerator up a ramp into a truck, or lifting it straight up and setting it in the truck? Explain.

4. Identify a case where an object is moving over a surface with friction, but the frictional force does no work.

We know from the reading that it is possible to move the same object two different distances and still do the same amount of work. Let's consider an example in which Jane pushes a block of ice up an incline while Kip lift the same block of ice vertically to the top of the same incline. See the figure below. (look at picture) We will assume that there is no friction between the surface of the incline and the block of ice. Both of these situations will require the same amount of work and that the result of lifting the ice block to some height imparts potential energy to the ice. In this activity, we will make various calculation to help us better understand the relationship between work and potential energy and the idea of conservation of energy. For this activity we will assume that the mass of the ice block is 5.6 kg and the vertical height of the incline is 2 m. This is the vertical distance that Kip must lift the block of ice. We will assume that the acceleration due to gravity is 10…

A particle moves 5 m in the +x direction while being acted upon by a constant force F = 2i + 5j– k N. The work (in Joules) done on the particle by this force is Select one: O a. 16 O b. -5 O c. 12 O d. 25 O e. 10

Find the work done in joules by gravity as an object of the mass m 5 kg is raised up at constant speed from a height h;=26 m to a height h2=69 m. Consider g = 10 m/s2 A. None B. -2150 D. -6450 E. -4300 O < O a OUO DOE