In the figure below, a block slides down an incline. As it moves from point A to
ID: 1306586 • Letter: I
Question
In the figure below, a block slides down an incline. As it moves from point A to point B, which are 5.0 m apart, a force ??? acts on the block, with magnitude 3.0 N and directed down the plane. The magnitude of the frictional force acting on the block is 5.0 N. The kinetic energy of the block increases by 35 J between A and B.
1. What is the increase in thermal energy of the block-incline system?
2. Work done by F?
3. Work done by gravity?
Correct answers with full explanation will get best answer and 5 stars.
Explanation / Answer
1) increase in thermal enrgy, Wf = -wordone by frictiion
= -5*5
= -25 J
2) WF = 3*5 = 15 J
3) Wnet =increase in KE
Wg + WF + wf = 25
Wg + 15 - 25 = 35
Wg = 35+25 - 15
= 45 J