Intro to Energy & Kinetic Energy Video Lessons

Concept

# Problem: In which one(s) of the following situations will there be an INCREASE in Kinetic Energy?A. A projectile approaches its maximum height.B. A box is pulled across a rough floor at constant speed.C. A block slides down a frictionless inclineD. A stone at the end of a string is whirled in a horizontal circle at constant speed.E. A merry go round rotates faster due to the push by a person.

###### FREE Expert Solution

Kinetic energy is given by:

$\overline{){\mathbf{K}}{\mathbf{=}}\frac{\mathbf{1}}{\mathbf{2}}{{\mathbf{mv}}}^{{\mathbf{2}}}}$, where m is mass and v is velocity.

A.

As the projectile approaches its maximum height, the velocity becomes zero at the maximum height.

This means that the kinetic energy will be zero.

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###### Problem Details

In which one(s) of the following situations will there be an INCREASE in Kinetic Energy?

A. A projectile approaches its maximum height.

B. A box is pulled across a rough floor at constant speed.

C. A block slides down a frictionless incline

D. A stone at the end of a string is whirled in a horizontal circle at constant speed.

E. A merry go round rotates faster due to the push by a person.