lab2AccelGrav

# lab2AccelGrav - Physics 2010 Laboratory 2: Acceleration...

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1 Physics 2010 Laboratory 2: Acceleration from gravity NAME ________________________ Section Day (circle): M Tu W Th F Section Time: 8a 10a 12p 2p 4p TA Name: _____________________ In this lab you will do two separate experiments to explore how gravity makes things accelerate: one exploring a simple pendulum, the other measuring the motion of a freely-falling object. Prelab Work the prelab problems before the lab. Please turn in the online prelab before the lab or you will earn a 2-point penalty on the lab. You are encouraged to make a copy of your prelab responses so you can refer to them during the lab. A simple pendulum consists of a weight attached to a wire or string, hanging from a point where the string is attached – see the figure. 1. If you are not touching a stationary pendulum, it hangs straight down. What forces act on the weight as it hangs? Which direction (if any) is the net force? 2. Now imagine moving the weight a few degrees to one side and holding it still with your hand. What forces are acting on the weight now? Which direction (if any) is the net force? 3. Now imagine letting go. In the instant after you let go, what forces are acting on the weight? Which direction (if any) is the total force? 4. Our second experiment involves timing how long it takes a ball to fall from a certain height. Given the time t it takes a ball to fall a distance y , starting from rest and experiencing only the force of gravity, how can you calculate g , the acceleration due to gravity? 1. Setting Up the Pendulum (10 min.) First, get acquainted with the pendulum equipment. Examine the apparatus. A string hangs from a point. You can attach different weights to the end of the string. Length of the string can be adjusted with two knobs on top of the apparatus. Your measuring equipment includes a protractor to measure the string angle θ , a two-meter stick to measure the pendulum length, and a scale to measure the mass of the weights. Get some practice with the equipment, as follows. You don't have to write anything down. 1.

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## This note was uploaded on 08/24/2010 for the course PHYS 2010 taught by Professor Dubson during the Spring '06 term at Colorado.

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lab2AccelGrav - Physics 2010 Laboratory 2: Acceleration...

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