Procedures: 1. Place the tape on the table where the 100 em will be at the edge of the table. Table this down using a masking tape. 2. Measure the weight of the rubber stopper. 3. Connect the rubber stopper to one end of a 100 cm string. 4. Make a small \"hook\" at the other end for the hanging mass. 5. Locate the rubber stopper at a location that is 70 cm. Have a student to place the hanging mass and hold the mass. 6. Once the mass is hung, one person should be recording the event. Count back from 3, then allow the hanging mass to fall and the other student will be recording the movement. 7. You should repeat the experiment five times time different hanging mass. Data and Performance: Mass of the rubber stopper: g Height of the table: m Distance along the horizontal table: m Analysis: 1. Determine the measured acceleration in the table using the formula in prelab question 1 and the recording. 2. Determine the theoretical acceleration in the table using the formula in prelab question 2. 3. Determine the force of tension in the column, using g=9.8 N/kg. 4. Plot a data for the tension (in vertical axis) vs the acceleration (in horizontal axis), then determine an equation of line of best fit. Attach the graph at the end of the lab report. Discussion Questions: 1. Use the slope of the plot, determine the mass of the rubber stopper. Compared with the measured value, what is the percent of error? 2. Compare your measured and theoretical accelerations, which one is lower? What is the percent of error? 3. Does your result satisfy Newton's Second Law of Motion? Explain 4. We did not count for friction in these calculations, if we do, will the mass of the rubber stopper be higher or lower? Explain. Improvement Excellence Pre-Lab Questions The use of formula Pre-Lab Questions Sketch free body diagram in analysis Pre-Lab Questions Expression derivation process Lab Performance Knowing how to set up the experiment Lab Performance Taking the measurements during the experiment Lab Performance Communicate with group members effectivel Complete the measurement including the mass and the time Analysis Complete the required columns Analysis Graph relation with proper shapes and correct values Analysis Axes are labelled with proper units, values and line of best fit Discussion Use proper languages in stating the answers Discussion Level of detail the answer was provided Discussion Calculations involving percent A: /4 error - A i - Purpose: The purpose of the lab is to validate Newton's second law of motion using the set up as shown below: Introduction: To verify the Newton's second law of motion, we will use the mass- mass system as shown below: a In this setup, we will hang a mass on the other side of the string and allow the system to travel. Because the edge of the table is relatively smooth, we will not be using the pulley for this experiment. The acceleration can be determined from the video recording of the travelling mass on the horizontal table, while the tension is created by the hanging mass as shown. Prelab Questions (to be completed before the lab) 1. Assume the distance travelled on the table is d, and that you are given the time, t, derive an expression for the acceleration of the system. You may assume that there is no initial velocity. 2. Assume the cart has a mass of M and the hanging mass has a mass of m, derive an expression for the acceleration for the system. Free body diagram is a must