Question

Consider the scenario where you lift your pencil (mass m) from the ground to a height Δh above the ground. 6.1. Assuming that you lift the pencil at a constant speed, draw the forces acting on the pencil and derive an expression for the work done by you on the pencil in the process of lifting it to the height Δh. 6.2. What is the change in gravitational potential energy of the pencil (ΔPE)? 6.3. Now consider what happens when you drop the pencil. Describe the energy transformations that occur. 6.4. Show that the kinetic energy gained by the pencil just before it strikes the ground is equal to its loss of gravitational potential energy (-ΔPE).

          Consider the scenario where you lift your pencil (mass m) from the ground to a height Δh above the ground.

6.1. Assuming that you lift the pencil at a constant speed, draw the forces acting on the pencil and derive an expression for the work done by you on the pencil in the process of lifting it to the height Δh.

6.2. What is the change in gravitational potential energy of the pencil (ΔPE)?

6.3. Now consider what happens when you drop the pencil. Describe the energy transformations that occur.

6.4. Show that the kinetic energy gained by the pencil just before it strikes the ground is equal to its loss of gravitational potential energy (-ΔPE).

consider the scenario where you lift your pencil mass m from the ground to a height h above the ground 61 assuming that you lift the pencil at a constant speed draw the forces acting on the 86806

Added by Jeremy W.

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