Experiment 1 Newton s First Law of Motion In this experiment you perform a series of motions and analyze the results to explain Newton s First Law of Motion Materials 1 3 by 5 Notecard 1 8 oz Styrofoam Cup 1 Washer Deep Container Bowl or Pitcher Water You Must Provide Procedure Part 1 1 Fill the container with about four inches of water 2 Find an open space outside to walk around in with the container of water in your hands 3 Perform the following activities and record your observations of each motion in Table 1 a Start with the water at rest e g on top of a table Grab the container and quickly accelerate it b Walk with constant speed in a straight line for 15 feet c After walking a straight line at constant speed make an abrupt right hand turn Repeat with a left hand turn d After walking a straight line at constant speed stop abruptly Part 2 1 Place a 3 x 5 notecard on top of a Styrofoam cup 2 Place a washer on the middle of the 3 x 5 notecard 2014 eScience Labs LLC All Rights Reserved 3 Hold the Styrofoam cup with your non dominant hand and flick the notecard with your dominant hands the hand you write with so it moves off of the Styrofoam cup Record your observations in Table 2 4 Repeat Steps 1 3 four times for a total of five trials Table 1 Motion of Water Observations Motion Observations a Water sloshed backwards b Water moved minimally c Water sloshed in opposite direction of movement d Water sloshed forwards Table 2 Observations After Flicking Notecard Off of Cup Trial Observations 1 Notecard moved but was not knocked completely off 2 Notecard fell off and washer went in cup 3 Notecard fell off and washer went in cup 4 Notecard did not fall off but washer did 5 Notecard fell off and washer fell into the cup Post Lab Questions 1 Explain how your observations of the water and washer demonstrate Newton s law of inertia The washer fell into the cup because the force was not exerted on the washer and so it remained still 2014 eScience Labs LLC All Rights Reserved 2 Can you think of any instances when you are driving or riding a car that are similar to this experiment Describe two instances where you feel forces in a car in terms of inertia When there is a sudden stop in a car all people and objects are thrown forward hopefully caught by their seatbelt Another instant is when a car makes a sharp turn you will be thrown in the opposite direction of the movement This is also a result of inertia because your body does not have the force directly applied to it as the car does Your body receives the motion from the car as it pulls you along Experiment 2 Newton s Third Law and Force Pairs 2014 eScience Labs LLC All Rights Reserved In this experiment you will investigate Newton s Third Law of Motion by observing forces exerted on objects Materials 5 N Spring Scale 10 N Spring Scale 2 30 cm Pieces of String 0 5 kg Mass Pulley Procedure Part 1 1 Make sure the spring scales are calibrated using the standard masses 2 Hook the handle of the 5 N spring scale to the hook of the 10 N spring scale 3 Holding the 10 N spring scale stationary pull the hook of the 5 N spring scale until the force reads 5 N on it Record the force on the 10 N spring scale in Table 3 4 Repeat Steps 2 and 3 with the 10 N spring scale hanging from the 5 N spring scale Record the force on the 5 N spring scale in Table 3 Part 2 1 Suspend the 0 5 kg mass in the air using the 10 N spring scale Record the force on the 10 N spring scale in Table 4 2 Tie one end of one of the pieces of string to the 0 5 kg mass and the other end to the hook of the 10 N spring scale 3 Suspend the mass in the air by lifting the 10 N spring scale Record the force on the 10 N spring scale in Table 4 Table 3 Force on Stationary Springs 2014 eScience Labs LLC All Rights Reserved Force on Stationary 10 N Spring Scale N 5 6N Force on Stationary 5N Spring Scale N 5N 4 Untie the end of the string attached to the 0 5 kg mass and tie it to the hook of the 5 N spring scale 5 Hook the 0 5 kg mass to the handle of the 5 N spring scale Suspend the mass scales and string by holding the handle of the 10 N spring scale Record the values of the spring scales in Table 4 Figure 5 Pulley Set Up 6 Secure the pulley on a table top by tying string to one of the hooks Then use masking tape to secure the string to a table top so that the hook on the top of the pulley lays flat on the side of the table top Figure 5 7 Using the mass setup from Step 5 place the string over the pulley by unhooking one of the spring scales feeding the string through the pulley and reattaching the string to the hook of the spring scale Figure 6 8 Hold the 10 N spring scale in place so that the scales and mass are stationary Record the values for both spring scales in Table 4 2014 eScience Labs LLC All Rights Reserved Figure 6 Step 7 reference string length and mass may vary Table 4 Spring Scale Force Data Suspension Set Up Force N on 10 N Spring Scale 0 5 kg Mass on 10 N Spring Scale 4 9 0 5 kg Mass with String on 10 N Spring Scale 5 0 0 5 kg mass string and 5 N Spring Scale on 10 N spring scale 5 0 3 1 0 5 kg mass string and 5 N Spring Scale on 10 N spring scale on Pulley 5 3 4 9 2014 eScience Labs LLC All Rights Reserved Force N on 5 N Spring Scale 3 9 Post Lab Questions 1 How did the magnitude of the forces on both spring scales compare after you moved the 10 N spring scale The 10N scale has a less accurate reading but was pretty comparable to the 5N readings 2 How did the magnitude of the forces on both spring scales compare after you move the 5 N spring scale This did not have much effect on the readings it slightly lowered it 3 Use Newton s 3rd Law to explain your observations in Questions 1 and 2 Because for every reaction there is an equal and opposite reaction when you move one of the scales all parts are affected 4 Compare the force on the 10 N spring scale when it was directly attached to the 0 5 kg mass and …
View Full Document
Unlocking...