Question

1. moving a book to a lower shelf decreases its potential energy.

true
false

1. a rock at the edge of a cliff has kinetic energy because of its position.

true
false

1. energy that is stored is kinetic energy.

true
false

1. a compressed spring does not have elastic potential energy.

true
false

1. a kite stuck in a tree has ______ energy due to its position.

a) potential
b) kinetic
c) chemical
d) thermal

Explanation:

Question 1

Potential energy (PE) depends on height: \( PE = mgh \). Lowering the book (decreasing \( h \)) decreases \( PE \). So the statement is true.

Kinetic energy (KE) is for motion (\( KE=\frac{1}{2}mv^2 \)). A rock at rest on a cliff has potential energy (due to position), not KE. So the statement is false.

Stored energy is potential energy (e.g., gravitational, elastic). Kinetic energy is energy of motion. So stored energy is not kinetic. The statement is false.

Answer:

True

Question 2