# Lab Free Fall

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3rd physics lab report
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INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERING I.E.E.E (EX-INELEC) Free Fall 3rd laboratory report   17/02/2013   Members:    SALAH AMIR Ismail    HADRI Kheyreddine    MHAMDI AbdelMoumen Getting familiarized with Newton’s laws of motion .  1 Introduction   A lot of things fall down and you have probably seen one of them or two, but is it true that the distance of the body that is falling is proportional to square of the time? Objectives:    Prove that the distance a body falls is proportional to the square of time.    Determine the acceleration g due to gravity.    Learning how to use the free fall frame. Apparatus: Photo-gate, Free fall frame, iron ball. The Photogate: is a timing device which is useful for measuring events which happen faster than you can time by hand. It is also useful in determining the speed of many objects. The Photogate consists of an infrared diode and a photocell. Timing occurs when the infrared beam between the diode and photocell is interrupted. You can’t see the beam, but it is there.  The numbers in the display show the time of the event in seconds. Timing Modes    The GATE mode produces the time interval the beam was broken. You use this mode to find out how long it took something to move through the beam. Very useful in determining speed.    The PULSE mode measures the time between the beam being broken until it is broken a second time. The first break starts the timer, the second break stops the timer.    PENDULUM mode measures the time between the beam being broken and the third time the beam is broken. The first break starts the timer, the second break is ignored, the third break stops the timer.  2 Using the Photogate: To determine speed:    Set the timer in the GATE mode.    Set-up the Photogate so that the object passes through the beam at right angles to the beam.    Measure the width of the object which is breaking the beam. This object must have definite edges and pass through the beam at right angles.    Since speed is distance/time, divide the width of the object by the time on the Photogate to get the speed. Measuring elapsed time of travel:    Use the Photogate as a semi-automatic stop watch.    Set the timer in the PULSE mode.    Set-up the Photogate so that the object will pass through the beam at right angles to the beam. The timer should be at the end point of the motion. Procedure:    Set the free fall frame up carefully by leveling it using the screws in the base with the aid of a plumb line; make sure that the ball that will be dropped from the ball releaser will fall into the catcher.    Connect an electronics timer and a photo-gate unit to the frame (the circuit wiring instructions are shown in the Figure 1 ).    Turn on the timer and start the clock, pass your hand through the space inside the photo-gate unit, this should cause the clock to start.    Hang a ball in the ball releaser and make sure that the clock is stopped. Carefully press the ball releaser bar, taking care not to shake the frame.    When the ball leaves the releaser, the clock should start. Now you are ready to start the free fall fame.    Mount the photo-gate on the frame.    Place the ball in the releaser and start the timer manually, raise the ball carefully until the timer stops (this is the starting point for the distance measurement; mark it with a removable mark).  3    Set the photo-gate down to any position. Measure the distance between the new position of the Photogate and the starting point three times.    Set a ball in the ball releaser. Stop and rest the clock and make at least three measurement of the time t to the free fall of the ball for the distance you have chosen.    Repeat the last two procedures for at least five very different free fall distances. Data: Tabulating the data of the distance: S(cm) 10 20 30 40 50 60 70 80 90 T 1 (ms) 142 205 245 285 322 349 378 406 429 T 2 (ms) 144 199 243 290 321 356 371 400 427 T 3 (ms) 143 206 247 286 323 346 382 403 430
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