Question

Background info: In this experiment, a cart slid down a linear track at a certain incline. This is used to approximate a one-dimensional frictionless surface. As it goes down the track, it passed through two photogate timers that are a certain distance apart. Record the time it passed through photogate 1, then photogate 2. Does it make a difference if the photogates are close or far apart, when calculating gravitational force?

What's the role of friction in the measurement of gravity?

Answer 1

Let the slope of the track be θ and distance between the gates be d.

We assume the cart slids down with no initial velocity, and passes first and second photogate at time t1 and t2.

Using Newton's 2nd Law of Motion, we getis the required answer.

The distance doesn't make a difference while calculating acceleration due to gravity

The friction will reduce the apparent acceleration due to gravity as it opposes the motion.