3. A spring can exert forces of all different sizes. How can it be said to have

Question

3. A spring can exert forces of all different sizes. How can it be said to have a spring constant, also called a stiffness constant or force constant or k value or Hooke's law constant? 4. What sort of object had kinetic energy? That is, in what situation must the object be, to possess nonzero kinetic energy?
5. If an object has 6 J of kinetic energy, how can it do 6J of work? That is, what process should t undergo to do 6J of work?
6. What sort of object has gravitational energy?
7. If an object has 6 J of gravitational energy, in what process can it do 6 J of work?
8. What sort of object has elastic energy?
9. If a spring has 6 J of elastic energy, in what process can it do 6 J of work?
10. Can an object have both kinetic energy and gravitational energy at the same time? Explain your answer. 2. Assume you push on an object in the direction of its motion with the force shown in the graph a function of the distance the object moves. Find the work you do on the object. Question 2 45 05 Position (m) 3. A spring can exert forces of all different sizes. How can it be said to have a spring constant also called a stiffness constant or force constant or k value or Hooke's-law constant? 4. What sort of object has kinetic energy? That is, in what situation must the object be, to possess nonzero kinetic energy? 5. If an object has 6 J of kinetic energy, how can it do 6 J of work? That is, what process should it undergo to do 6 J of work? 6. What sort of object has gravitational energy? 7. If an object has 6 J of gravitational energy, in what process can it do 6 J of work? 8. What sort of object has elastic energy? 9. If a spring has 6 J of elastic energy, in what process can it do 6 J of work? 10. Can an object ha ve both kinetic energy and gravitational energy at the same time? Explain your answer.

Explanation / Answer

2. The work done is defined as
W = F .d
Or from the force-position graph, it is the area under the line
From the graph, it can be seen that we have to find the area of the triangle

b = 9 m
h = 4.5 N
The area is
A = (1/2) b h
A = (1/2) x 9 m x4.5 N =  20.25
The work done is
W = 20.25 J

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