Post a New Question

physics

posted by .

A student is testing the kinematic equations for uniformly accelerated motion by measuring the time it takes for light-weight plastic balls to fall to the floor from a height of 3 m in the lab. The student predicts the time to fall using g as 9.8 m/s^2 but finds the measured time to be 35 % greater. Which of the following is the most likely cause of the large percent error?

a) the acceleration due to gravity is 70% greater than 9.8m/s^2 at this location
b) the acceleration due to gravity is 70% less than 9.8 m/s^2 at this location
c) Air resistance increases the downward acceleration
d) the acceleration of the plastic balls is not uniform
e)the plastic balls are not truelly spherical.

Well I think e) could be true but a bit unlikely. I think that d) would be wrong because 9.8m/s^2 is constant. So it leaves either a) or b). I believe it’s b) since it would take longer for an object to fall it acceleration is less.

The only answer that makes any sense is (d). The downward acceleration decreases as air resistance increases.

Air resistance DEcreases the downward acceleration. The part of the acceleration that is due to gravity does not change.

  • physics -

    I agree.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Physics, please help

    Hello, I don't know how about to answering this question: work out the problem of a ball of mass m that falls a distance h from rest. It hits the floor and rebounds to its starting height. (a) What total time ie required for the motion?
  2. physics

    A 640 N student stands on a bathroom scale in an elebator. As the elevator starts moving, the scale reads 800 N. a) find the acceleration of the elevator (magnitude and direction) b) acceleration if the scale reads 450N?
  3. Science - Physics

    When a projectile is fired horizontally, which of the components of its motion is (A) motion at constatnt speed (B) uniformly accelerated motion (C) If the initial velocity of the projectile is increased, what effect will this have …
  4. physics

    A stone is dropped off the science building and accelerates, from rest, toward the ground at 9.8 m/s/s. A curious physics student looks out the third floor window as the stone falls past. She happens to have a stopwatch and she finds …
  5. Physics

    A stone is dropped off the science building and accelerates, from rest, toward the ground at 9.8 m/s/s. A curious physics student looks out the third floor window as the stone falls past. She happens to have a stopwatch and she finds …
  6. Physics

    a student sees a ball fall from the third floor of a building and notes that it takes 2.50 s for the ball to fall the last half of the way to the ground. What is the height of the building?
  7. Physics

    Projectile motion problem where a projectile is launched from level ground and lands on level ground. I have to use the kinematic equations to show that the time it takes for the projectile to reach its maximum height is equal to one …
  8. physic

    Somehow two students managed to open two windows at the library. Student A is 17 m above the ground and Student B is 23.5 m above the ground. At the same time that Student A drops a ball, Student B throws a ball straight down at an …
  9. physic

    Somehow two students managed to open two windows at the library. Student A is 17 m above the ground and Student B is 23.5 m above the ground. At the same time that Student A drops a ball, Student B throws a ball straight down at an …
  10. physics

    A student in the fitness center lifts a weight with m = <81.5> kg from the floor to a height of <2.7> meters in a time of <15.50> seconds. Find the average power exerted by the student during this time. Give your …

More Similar Questions

Post a New Question