Return to Blog Homepage

MCAT Physics Question — Neil Armstrong

  • by John
  • Nov 10, 2014
  • MCAT Blog, MCAT Physics, MCAT Question of the Day

Neil Armstrong, standing on the Moon, is attempting to measure the acceleration due to gravity on the Moon. To do so, he is dropping a feather a distance of 2 meters and measuring the time it takes the feather to fall to the ground. Changing which of the following would change the measurements taken?

 

A) The mass of the feather

B) The shape and aerodynamic profile of the feather

C) Throwing the feather horizontally at 0º above the horizon rather than dropping it.

D) The radius of the moon.

 

Explanation

 

The gravitational acceleration between an object and a planet is given by:

 

g = GMplanet / r2

 

where G is the universal gravitational constant. Thus, changing the radius of the Moon would change the acceleration due to gravity and (D) is the right answer.

 

A: All objects fall at the same acceleration, regardless of their own mass.

B: There’s no atmosphere on the moon so the shape of the feather is irrelevant.

C: Horizontal motion is independent of vertical in projectile motion, so an object thrown straight out will hit the ground at the same time as an object dropped.

 

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 Advisor using the form below. No obligation, just expert advice.

Schedule My Free Consultation

Submit a Comment