Question

An acorn falls from a tree. Compare its kinetic energy (KE) to its potential energy (PE) during the falling process.

A) KE increases and PE decreases

B) KE decreases and PE decre

C) KE increases and PE increases

D) both KE and PE remain constant

What type of force is needed to make any object move in a circular path?

A) a normal force

B) an abnormal force

C) a centripetal or radial force

D) military force

Answer 1

When acorn falls from a free, then kinetic energy increases and potential energy decreases. Potential energy decreases because height decreases, and kinetic energy increases because speed increases when height decreases in case of free fall.

Thus correct option is (A).

In a circular motion, a centripetal force needs to move aa object in a circular path. This centripetal force acts in radial direction,that is why it is called radial force.

Thus correct option is (C).