# MCAT Physics Question — Frictional Surface

• Reviewed By: Liz Flagge
• Two people push a box equal distances along an effectively frictionless surface. One pushes the box at an angle of 30° to horizontal with force F while the other pushes the box horizontally with force Fcos30°. Which person does the most work?

a) Person A

b) Person B

c) Person A and B do equal amounts of work

d) cannot be determined

Explanation

Work is only done by force parallel to the direction of motion per the relationship W=Fdcosθ, and proportional to the distance over which the force is applied. For person A, the vertical component of force F, Fsin30°, does no work since the box moves neither up nor down. Only the horizontal component of the force, Fcos30°, does any work.  For both person A and B, only the force parallel to the motion of the box over the surface does any work. Therefore, the work done by person A and B is equal.

a) Person A, incorrect.

b) Person B, incorrect.

c) Person A and B do equal amounts of work, correct.

d) cannot be determined, incorrect.

## Want more MCAT practice?

### We’ve got options for every schedule and learning style!

From the best online MCAT course created by top instructors with 524+ MCAT scores to the most representative full-length practice exams and private tutoring, we can custom tailor your MCAT prep to your goals!

Not sure which option is right for you? Schedule a free MCAT consultation with an MCAT expert using the form below. No obligation, just expert advice.

Schedule My Free Consultation