# Hypothesis When Force Increase Acceleration

Purpose: The purpose of this lab is to prove when force increases acceleration also increases. The independent variable is amount of force applied to the Lenny Board and the dependant variable is the acceleration of the Lenny Board. 3 controlled variables are mass, surface of testing, and the Lenny Board (the weight, the amount of grease on the bearings, ECT) itself.

Hypothesis 1: If we increase force on a Lenny Board the acceleration will increase.

Hypothesis 2: Applying 6 newtons of force to a 2.27 kilogram object it will make the object accelerate to 2.64 m/sec2. Then applying 8 newtons of force will accelerate

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This way is increasing or decreasing force. The first trial with 6 newtons accelerated the 2.27 kilogram Lenny Board to 1.04 m/sec2, then on the second trial 8 newtons accelerated the Lenny Board(same mass)to 1.77 m/sec2. Then the final trial with the same mass and 10 newtons accelerated the Lenny Board to 2.30 m/sec2. The slope of my or any speed vs. time graph tells acceleration. This is because speed is on the Y axis and time is on the X axis so you could think of it as speed/time which equals acceleration. All of the speed vs. time graph slopes were different. The one with line with the lowest slope was at 6 Newtons and accelerated the slowest. The middle slope had 8 newtons and it accelerated faster than the 6 newton trail but not as fast as the 10 newton trail. Finally the greatest slope had the fastest acceleration because it had more force than any other trial. Because of the data we collected during the 3 trials I found that the average acceleration was 1.705 m/sec2. Using this I predict that a test with 12 newtons of force the Lenny Board will accelerate to 4.0 m/sec2. Also testing with 14 newtons of force I predict it would accelerate to 5.705 m/sec2. I got both of the predicted times by adding 1.705(the average acceleration for 2 newtons on the Lenny Board is 1.705 m/sec2) to its previous acceleration. I could only do this

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This is proved by the vast difference in our data and our hypothesized data. The 2nd hypothesis claimed that the board would accelerate to 2.64 m/sec2 with 6 newtons of force. But in reality it only accelerated to 1.04 m/sec2. Also the hypothesis claimed that at 8 newtons the board would accelerate to 3.52 m/sec2. Alas the hypothesis was gravely off and at 8 newtons the board only accelerated to 1.77 m/sec2. Now we get to the last error where the hypothesis predicted that the board would accelerate to 4.41m/sec2 at 10 newtons, the board only accelerated to 2.30 m/sec2. We could have found out how much gravity acted on a 2.27 kilogram object by looking it up. But it was just a hypothesis which is basically an educated guess. Hypothesis 1 on the other hand was supported because with the data recorded from the trials proved that more force acting on the object means more acceleration also all it said was “If we increase Force on a Lenny Board then acceleration will increase.” The only thing that could have made that more true was if “assuming that mass stays constant” was added to the end of it. This was supported because one Newton’s second law states in simple terms F=ma or m=F/a and a=F/m the third equation means that for more acceleration you need more force. But this force is