Narissa Kunkudatharn 9B Orange HouseHow does changing the load affect the amount of force produced?INTRODUCTIONA lever is a simple machine that is used to lift heavy weights with the least amount ofeffort. It involves exerting a force by moving the load around a fulcrum. The load is ascientific name for the weight while effort is the force exerted to move the load. Andthe fulcrum is the place where the lever pivots. Levers are used in everyday life from asimple door handle to a pair of scissors and even a screw driver.AIMHow does changing the load affect the amount of force produced?HYPOTHESISI predict that the more mass/load is added the more force it would need to lift thelever because according to the formula F=m*a, if the mass increases you need to applymore force in order to achieve the same result.VARIABLESIndependent variable:Load (50g each)Dependent variable: Force (Newtons)Fixed variables: Fulcrum position (12 inch), length of lever, same people doingexperiment e.g. person who adds the load and person who measures the force.MATERIALS USED1X 24Inch lever1X Fulcrum1X Force meter (preferably one that measures smaller weights in Newtons)6X 50g of load1X 12Inch rulerPROCEDURE 1. Collect all the materials listed above
Narissa Kunkudatharn 9B Orange House 2. Start by finding the center point of the 24inch lever (12inch from one edge of the lever) 3. Place the fulcrum at the center point of the lever i.e. at the 12 inch mark. 4. Place half the lever on the table and half off 5. Put 0.1kg weight (2 loads of 50 g) on the side of the lever that is on the table 6. Use a force meter to measure how much force it takes to lift that weight. 7. Record the answers 8. Repeat steps 5-7, FIVE times each for the following weights:0.1, 0.2, 0.3 9. Find the average for each of the weights Here is a picture/ diagram of how you would set up the lever: FORCEMETERLOAD LEVER FULCRUM RISKS THAT MIGHT OCCUR IN THE EXPERIMENT! In this experiment the risks that could occur are the loads falling on your foot or the force meter falling on your foot. Because when you are adding or removing the load the load may have a chance of rolling off the table and hitting your foot. Also, during the experiment the force meter fell twice on the ground, but it was likely to hit someone’s foot. This happened by removing the load before removing the force meter from the lever. Because when you remove the load first there is no weight for the force meter to hold so it just falls on the ground.
Narissa Kunkudatharn 9B Orange House RESULTS Quantitative data table: Raw Data: Average force exerted to lift the load (Newtons)Load (kg) Try 1 Try 2 Try 3 Try 4 Try 5 Average0.1 0.7 0.6 0.7 0.7 0.6 0.660.2 1.8 1.7 1.6 1.7 1.7 1.70.3 2.7 2.7 2.7 2.8 2.7 2.72 OBSERVATIONS During the experiment I observed that when more load is added I was exerting more force. Also, on the table above the average tell you that the difference between the load is around 1.0 newtons. CALCULATIONS To calculate the average we just needed to take all the numbers from each trial and add them up together and then divide the number by five. You divide it by 5 because there are 5 trials in totals. For Example, 0.7+0.6+0.7+0.7+0.6= 3.3 3.3/5=0.66 Ans: 0.66
Narissa Kunkudatharn 9B Orange House Processed Data: Force needed to lift the load 3 2.5Force Needed (Newtons) 2 1.5 1 0.5 0 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 Load (kg) ANALYSIS In the graph above it shows the average of force (N) needed to lift each load (kg). In the graph there is a linear trend line to show between each data and the data clearly shows that there are no anomalies because the data is following a trend pattern. The trend shows a positive direct relationship between the load and the force needed to lift the load and this shows that when the load increases the force increases as well. Because the points are all head-to-head with each other and this clearly proves that my aim is correct.
Narissa Kunkudatharn 9B Orange HouseCONCLUSIONAs the load (kg) increases, the force (N) needed to lift the object up also increases.Therefore, my results indicate that my hypothesis was accurate. According to theformula F=m*a, acceleration is gravity and gravity is same all around earth (9.8m/s²).So when you add the mass (which in this case is the load) then you would require moreforce to move it because acceleration and gravity are constant.SCIENTIFIC EXPLANATIONAcceleration is caused by a net force on an object. On earth one force that isalways present is gravity which pulls down on any object that has mass. Whengravity is the only force acting on an object, that object will accelerate at a rate of9.8 m/s² down towards. If all objects fall on this rate then mass is the factor thatdetermines the force required. Therefore, if gravity and acceleration are constantthen, the more mass of and object, the more the force required to move it.EVALUATIONThe experiment was prepared and planned out so that we would get the results asaccurate as possible. The whole experiment was fairly accurate because we tooktime and didn’t hurry whilst collecting the results. The graph was also accuratebecause all the points are close to the line of best fit or the linear trend line, whichmakes it easier to figure out the answer of the aim. During the conducting of theexperiment, working with my partner wasn’t that hard because we were bothfocused and well behaved. Some limitations we might have had were that we onlygot one size of a lever to choose from and one size of fulcrum which may have arole in our data and investigation results.FINAL CONCLUSIONThe data is rather reliable because I think by doing the experiment 5 times theexperiment was more precise as there was supported data in each one.All my fixedvariables were controlled during the whole experiment. In my data there are nooutliers, which is a good thing. As well as, my data follows a pattern showing thatthere is a smaller range in my data which means it is reliable.
Narissa Kunkudatharn 9B Orange HouseFURTHER WORKHow does changing the fulcrum position affect the amount of force produced? Works Cited"Q & A: How Does Gravity Affect Acceleration?" Physics Van.Web. 27 Feb. 2012. <http://van.physics.illinois.edu/qa/listing.php?id=214>.