Question

1. in which position is pe increasing and ke decreasing? 1 point

1
2
3
4
5

1. in which position is there all pe and no ke? 1 point

1
2
3
4
5

Explanation:

Step1: Understand energy conversion in pendulum

In a pendulum, as it moves from the lowest - point to the highest - point, potential energy (PE) increases and kinetic energy (KE) decreases.

Step2: Identify position for PE increasing and KE decreasing

Positions 1 and 5 are the highest points on either side of the pendulum's swing. As the pendulum moves towards these positions from the middle (position 3), PE increases and KE decreases. So for question 21, positions 1 and 5 are correct, but since we have to choose one, let's assume the general trend from the middle to the end - position, so 1 is a valid choice.

Step3: Identify position with all PE and no KE

At the highest points of the pendulum's swing (positions 1 and 5), the pendulum momentarily stops. At this instant, it has no velocity, so KE = 0, and all the mechanical energy is in the form of potential energy.

Answer:

1. 1
2. 1