Lab#3

# Lab#3 - Physics 1AL Introduction ACCELERATED MOTION Winter...

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Physics 1AL ACCELERATED MOTION Winter 2009 1 Introduction In this lab you will study the motion of an object that travels with a constant acceleration. You will do experiments with an object in “ free flight ” and measure the acceleration of gravity. You will then investigate the relationship between the force applied to a cart by a fan and the cart’s acceleration, and what happens if you use two fans, back to back. __________________________________________________________________________ Pre-lab Questions: 1. Write a vector equation for A for each arrangement of vectors. For example, if adding B and C gives A then write A = B + C . 2. A ball is thrown up from the top of the tower. At each of the following instants is the ball’s acceleration larger than g, equal to g, zero, or -g (assume up is positive, g = 9.80 m/s 2 ) a) Just after leaving your hand? b) When the ball is at its highest point? c) Just before hitting the ground? d) Draw graphs of position vs. time, velocity vs. time, and acceleration vs. time for the ball from the instant it leaves your hand until the instant before it hits the ground. 3. A cannonball is shot vertically upward with a velocity of 10 m/s. While it is rising in the air ( choose one and explain your choice ): a. its velocity and acceleration are both upward. b. its velocity is upward and its acceleration is downward. c. its velocity and acceleration are both downward. d. its velocity is downward and its acceleration is upward. e. its velocity and acceleration are both decreasing. 4. A cannonball is shot vertically upward with a velocity of 10 m/s. While it is falling back to Earth after ( choose one and explain your choice ): a. its velocity and acceleration are both upward. b. its velocity is upward and its acceleration is downward. c. its velocity and acceleration are both downward. d. its velocity is downward and its acceleration is upward. e. its velocity and acceleration are both decreasing. a) b) d) c) e)

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Physics 1AL ACCELERATED MOTION Winter 2009 2 A. Motion under gravity – the Ball Drop: Procedure A1. Please place the echo sensor on the floor so that it is not near any chairs or the table. You may need to fold down the front so it is facing vertically. Open Logger Pro. A2. Zero the sensor by holding a piece of paper in front of it, like in previous labs. A3. Hold the ball steady as high above the sensor as you can. Click to begin data collection. Drop the ball one second after the motion detector starts clicking.
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Lab#3 - Physics 1AL Introduction ACCELERATED MOTION Winter...

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